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{{Short description|Star in the constellation Leo}} |
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{{starbox short |
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{{Starbox begin |
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|constell= [[Leo (constellation)|Leo]] |
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|name= |
| name=φ Leonis |
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|type= A7IVn <ref name=SIMBAD> SIMBAD, [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Phi+Leonis&submit=SIMBAD+search Phi Leonis] (accessed 6 October 2012) </ref> |
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|ra= {{RA|11|16|39.69960}} <ref name=SIMBAD/> |
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|dec= {{DEC|-03|39|05.7770}} <ref name=SIMBAD/> |
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}} |
}} |
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{{Starbox observe |
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'''Phi Leonis''' ('''φ Leo''') is a [[star]] in the [[constellation]] [[Leo (constellation)|Leo]]. Its [[apparent magnitude]] is 4.47. |
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| constell = [[Leo (constellation)|Leo]] |
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| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) |
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| ra = {{RA|11|16|39.69960}}<ref name=vanLeeuwen2007/> |
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| dec = {{DEC|−03|39|05.7770}}<ref name=vanLeeuwen2007/> |
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| appmag_v = 4.46<ref name=Mermilliod1986/> |
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}} |
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{{Starbox character |
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| class = A7 IVn<ref name=Royer2007/> |
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| b-v = +0.22<ref name=Mermilliod1986/> |
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| u-b = +0.10<ref name=Mermilliod1986/> |
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| variable = |
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}} |
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{{Starbox astrometry |
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| radial_v = −3.0<ref name=Wielen1999/> |
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| prop_mo_ra = −110.37<ref name=vanLeeuwen2007/> |
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| prop_mo_dec = −37.16<ref name=vanLeeuwen2007/> |
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| parallax = 17.71 |
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| p_error = 0.25 |
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| parallax_footnote = <ref name=vanLeeuwen2007/> |
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| absmag_v = 0.56<ref name=aaa354_157/> |
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}} |
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{{Starbox detail |
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| mass = 1.59<ref name=David2015/> |
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| radius = 2.9<ref name=cadars/> |
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| luminosity = 39<ref name=Mcdonald2012/> |
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| temperature = {{Val|7680|261|fmt=commas}}<ref name=Royer2007/> |
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| metal_fe = |
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| gravity = 3.56<ref name=Royer2007/> |
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| rotational_velocity = 254<ref name=Royer2007/> |
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| age_myr = 432<ref name=Royer2007/> |
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}} |
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{{Starbox catalog |
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| names = [[Bayer designation|φ Leo]], [[Flamsteed designation|74 Leo]], [[Bonner Durchmusterung|BD]]−02°3315, [[FK5]] 1292, [[Henry Draper Catalogue|HD]] 98058, [[Hipparcos catalogue|HIP]] 55084, [[Harvard Revised catalogue|HR]] 4368, [[Smithsonian Astrophysical Observatory catalogue|SAO]] 138102<ref name=SIMBAD/> |
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}} |
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{{Starbox reference |
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| Simbad = phi+Leo |
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}} |
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{{Starbox end}} |
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'''Phi Leonis''' ('''φ Leo''') is a single<ref name=Hutter/> [[star]] in the [[constellation]] [[Leo (constellation)|Leo]]. It is bright enough to be seen with the naked eye, having an [[apparent visual magnitude]] of 4.46.<ref name=Mermilliod1986/> Based upon [[stellar parallax|parallax]] measurements,<ref name=vanLeeuwen2007/> the distance to Phi Leo is around 184 [[light year]]s. |
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The spectrum of this star fits a [[stellar classification]] of A7IVn,<ref name=Royer2007/> which suggests it is an [[A-type star|A-type]] [[subgiant star]] that has left the [[main sequence]] and is [[stellar evolution|evolving]] into a [[giant star]]. It is being viewed with the plane of the star's [[equator]] lying close the line of sight from the Earth,<ref name=Eiroa/> and shows a high rotation rate with a [[projected rotational velocity]] of 254 km/s.<ref name=Royer2007/> This rapid spin is giving the star an [[Oblate spheroid|oblate shape]] with an [[equatorial bulge]] that is 29% larger than the polar radius.<ref name=aar20_1_51/> |
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Phi Leonis has been mentioned as a [[shell star]]—indicating that there is a circumstellar disk of gas around the star's equator—and may display a slight [[variable star|variability]].<ref name=aaa354_157/> Sporadic variation of the spectra on the time scale of minutes up to months in duration suggests that solid, cometary bodies are in orbit around the star, with objects approaching close enough for [[refractory]] materials to [[Sublimation (phase transition)|sublimate]].<ref name=Eiroa/> Most [[exocomet]] hosts do have a [[Circumstellar disc|circumstellar disk]], which can act as an exocomet reservoir. Cold dust around Phi Leonis was not detected, and the star is not associated with a warm debris disk.<ref>{{Cite journal|last1=Cataldi|first1=Gianni|last2=Moór|first2=Attila|last3=Ohashi|first3=Nagayoshi|last4=Eiroa|first4=Carlos|last5=Grady|first5=Carol|last6=Rebollido|first6=Isabel|date=2019-02-22|title=No Detection of Cold Dust around the Potential Exocomet Host ϕ Leo|journal=Research Notes of the AAS|language=en|volume=3|issue=2|pages=39|doi=10.3847/2515-5172/ab082b|bibcode=2019RNAAS...3...39C |s2cid=127680980 |issn=2515-5172 |doi-access=free }}</ref> |
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==References== |
==References== |
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{{reflist |
{{reflist|refs= |
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<ref name=vanLeeuwen2007>{{citation |
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{{Stars of Leo}} |
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| title=Validation of the new Hipparcos reduction |
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| last1=van Leeuwen | first1=F. |
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| journal=Astronomy and Astrophysics |
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| volume=474 | issue=2 | pages=653–664 | date=2007 |
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| arxiv=0708.1752 | bibcode=2007A&A...474..653V |
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| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref> |
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<ref name=Royer2007>{{citation |
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[[Category:Leo (constellation)]] |
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| display-authors=1 | last1=Royer | first1=F. |
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| last2=Zorec | first2=J. | last3=Gómez | first3=A. E. |
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| title=Rotational velocities of A-type stars. III. Velocity distributions |
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| journal=Astronomy and Astrophysics |
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| volume=463 | issue=2 | pages=671–682 | date=February 2007 |
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| doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R |
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| arxiv=astro-ph/0610785 | s2cid=18475298 | postscript=. }}</ref> |
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<ref name=Wielen1999>{{citation |
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| title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic Fundamental Stars with Direct Solutions |
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| journal=Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg |
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| volume=35 |
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| display-authors=1 |
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| last1=Wielen | first1=R. | last2=Schwan | first2=H. |
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| last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. |
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| last5=Jahreiß | first5=H. | last6=Jährling | first6=R. |
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| publisher=Astronomisches Rechen-Institut Heidelberg |
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| issue=35 | pages=1 |
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| date=1999 |
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| bibcode=1999VeARI..35....1W | postscript=. }}</ref> |
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<ref name=David2015>{{citation |
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| last1=David | first1=Trevor J. |
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| last2=Hillenbrand | first2=Lynne A. |
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| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets |
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| journal=The Astrophysical Journal |
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| volume=804 | issue=2 | pages=146 | year=2015 |
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| bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146 |
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| arxiv=1501.03154 | s2cid=33401607 |
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| postscript=. }}</ref> |
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<ref name=aar20_1_51>{{citation |
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| last1=van Belle, Gerard T. | first1=Gerard T. |
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| title=Interferometric observations of rapidly rotating stars |
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| journal=The Astronomy and Astrophysics Review |
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| volume=20 | issue=1 | page=51 |date=March 2012 |
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| doi=10.1007/s00159-012-0051-2 | bibcode=2012A&ARv..20...51V |
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| arxiv=1204.2572 | s2cid=119273474 |
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| postscript=. }}</ref> |
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<ref name=cadars>{{citation |
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| display-authors=1 | last1=Pasinetti Fracassini | first1=L. E. |
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| last2=Pastori | first2=L. | last3=Covino | first3=S. |
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| last4=Pozzi | first4=A. |
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| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics |
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| journal=Astronomy & Astrophysics |
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| volume=367 | issue=2 | pages=521–24 | date=2001 |
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| bibcode=2001A&A...367..521P | doi=10.1051/0004-6361:20000451 |
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| arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}</ref> |
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<ref name=aaa354_157>{{citation |
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| last1=Hauck | first1=B. | last2=Jaschek | first2=C. |
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| title=A-shell stars in the Geneva system |
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| journal=Astronomy and Astrophysics |
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| volume=354 | pages=157–162 | date=February 2000 |
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| bibcode=2000A&A...354..157H | postscript=. }}</ref> |
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<ref name=Mcdonald2012>{{citation |
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| display-authors=1 | last1=McDonald | first1=I. |
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| last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. |
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| title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars |
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| journal=Monthly Notices of the Royal Astronomical Society |
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| volume=427 | issue=1 | pages=343–57 | date=2012 |
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| bibcode=2012MNRAS.427..343M | arxiv=1208.2037 |
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| doi=10.1111/j.1365-2966.2012.21873.x | s2cid=118665352 | postscript=. }}</ref> |
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<ref name=Hutter>{{cite journal |
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| title=Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars | year=2021 |
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| last1=Hutter | first1=D. J. | last2=Tycner | first2=C. |
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| last3=Zavala | first3=R. T. | last4=Benson | first4=J. A. |
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| last5=Hummel | first5=C. A. | last6=Zirm | first6=H. |
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| journal=The Astrophysical Journal Supplement Series |
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| volume=257 | issue=2 | page=69 |
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| doi=10.3847/1538-4365/ac23cb | arxiv=2109.06839 |
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| bibcode=2021ApJS..257...69H | s2cid=237503492 | doi-access=free |
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}}</ref> |
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<ref name=Mermilliod1986>{{citation |
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| last1=Mermilliod | first1=J.-C. |
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| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) |
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| journal=Catalogue of Eggen's UBV Data |
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| publisher=[[SIMBAD]] | date=1986 | bibcode=1986EgUBV........0M | postscript=. }}</ref> |
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<ref name=Eiroa>{{citation |
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| display-authors=4 |
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| first1=C. | last1=Eiroa | first2=I. | last2=Rebollido |
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| first3=B. | last3=Montesinos | first4=E. | last4=Villaver |
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| first5=O. | last5=Absil | first6=Th. | last6=Henning |
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| first7=A. | last7=Bayo | first8=H. | last8=Canovas |
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| first9=A. | last9=Carmona | first10=Ch. | last10=Chen |
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| first11=S. | last11=Ertel | first12=D. P. | last12=Iglesias |
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| first13=R. | last13=Launhardt | first14=J. | last14=Maldonado |
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| first15=G. | last15=Meeus | first16=A. | last16=Moór |
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| first17=A. | last17=Mora | first18=A. J. | last18=Mustill |
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| first19=J. | last19=Olofsson | first20=G. | last20=Rauw |
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| first21=P. | last21=Riviere-Marichalar |
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| first22=A. | last22=Roberge |
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| title=Exocomet signatures around the A-shell star Φ Leo? |
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| journal=Astronomy & Astrophysics | volume=L1 | pages=594 | date=September 14, 2016 |
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| arxiv=1609.04263 | postscript=. |doi = 10.1051/0004-6361/201629514 |bibcode = 2016A&A...594L...1E | s2cid=41231308 | url=http://orbi.ulg.ac.be/bitstream/2268/204875/1/aa29514-16.pdf}}</ref> |
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<ref name=SIMBAD>{{cite simbad |
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| title=ups Leo |
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| accessdate=2016-09-29 | postscript=. }}</ref> |
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}} |
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{{Stars of Leo|state=collapsed}} |
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{{DEFAULTSORT:Phi Leonis}} |
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[[Category:A-type subgiants]] |
[[Category:A-type subgiants]] |
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[[Category:Shell stars]] |
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[[Category:Leo (constellation)]] |
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[[Category:Bayer objects|Leonis, Phi]] |
[[Category:Bayer objects|Leonis, Phi]] |
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[[Category:Flamsteed objects|Leonis, 74]] |
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[[Category:Henry Draper Catalogue objects|098058]] |
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{{Star-stub}} |
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[[Category:Hipparcos objects|055084]] |
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[[Category:Bright Star Catalogue objects|4368]] |
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[[Category:Durchmusterung objects]] |
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
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Constellation | Leo |
Right ascension | 11h16m 39.69960s[1] |
Declination | −03° 39′ 05.7770″[1] |
Apparent magnitude (V) | 4.46[2] |
Characteristics | |
Spectral type | A7 IVn[3] |
U−B color index | +0.10[2] |
B−V color index | +0.22[2] |
Astrometry | |
Radial velocity (Rv) | −3.0[4] km/s |
Proper motion (μ) | RA: −110.37[1] mas/yr Dec.: −37.16[1] mas/yr |
Parallax (π) | 17.71 ± 0.25 mas[1] |
Distance | 184 ± 3 ly (56.5 ± 0.8 pc) |
Absolute magnitude (MV) | 0.56[5] |
Details | |
Mass | 1.59[6] M☉ |
Radius | 2.9[7] R☉ |
Luminosity | 39[8] L☉ |
Surface gravity (log g) | 3.56[3] cgs |
Temperature | 7,680±261[3] K |
Rotational velocity (v sin i) | 254[3] km/s |
Age | 432[3] Myr |
Other designations | |
φ Leo, 74 Leo, BD−02°3315, FK5 1292, HD 98058, HIP 55084, HR 4368, SAO 138102[9] | |
Database references | |
SIMBAD | data |
Phi Leonis (φ Leo) is a single[10] star in the constellation Leo. It is bright enough to be seen with the naked eye, having an apparent visual magnitude of 4.46.[2] Based upon parallax measurements,[1] the distance to Phi Leo is around 184 light years.
The spectrum of this star fits a stellar classification of A7IVn,[3] which suggests it is an A-type subgiant star that has left the main sequence and is evolving into a giant star. It is being viewed with the plane of the star's equator lying close the line of sight from the Earth,[11] and shows a high rotation rate with a projected rotational velocity of 254 km/s.[3] This rapid spin is giving the star an oblate shape with an equatorial bulge that is 29% larger than the polar radius.[12]
Phi Leonis has been mentioned as a shell star—indicating that there is a circumstellar disk of gas around the star's equator—and may display a slight variability.[5] Sporadic variation of the spectra on the time scale of minutes up to months in duration suggests that solid, cometary bodies are in orbit around the star, with objects approaching close enough for refractory materials to sublimate.[11] Most exocomet hosts do have a circumstellar disk, which can act as an exocomet reservoir. Cold dust around Phi Leonis was not detected, and the star is not associated with a warm debris disk.[13]
{{cite web}}
: CS1 maint: postscript (link)
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