Added free to read link in citations with OAbot #oabot
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<ref name=Wielen1999>{{citation |
<ref name=Wielen1999>{{citation |
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| title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic Fundamental Stars with Direct Solutions |
| 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 |
| display-authors=1 |
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| last1=Wielen | first1=R. | last2=Schwan | first2=H. |
| last1=Wielen | first1=R. | last2=Schwan | first2=H. |
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| last5=Jahreiß | first5=H. | last6=Jährling | first6=R. |
| last5=Jahreiß | first5=H. | last6=Jährling | first6=R. |
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| publisher=Astronomisches Rechen-Institut Heidelberg |
| publisher=Astronomisches Rechen-Institut Heidelberg |
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| issue=35 | date=1999 |
| issue=35 | pages=1 |
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| date=1999 |
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| bibcode=1999VeARI..35....1W | postscript=. }}</ref> |
| bibcode=1999VeARI..35....1W | postscript=. }}</ref> |
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| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics |
| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics |
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| journal=Astronomy & Astrophysics |
| journal=Astronomy & Astrophysics |
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| volume=367 | pages=521–24 | date=2001 |
| volume=367 | issue=2 | pages=521–24 | date=2001 |
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| bibcode=2001A&A...367..521P | doi=10.1051/0004-6361:20000451 |
| bibcode=2001A&A...367..521P | doi=10.1051/0004-6361:20000451 |
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| arxiv=astro-ph/0012289 | postscript=. }}</ref> |
| arxiv=astro-ph/0012289 | postscript=. }}</ref> |
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| last1=Mermilliod | first1=J.-C. |
| last1=Mermilliod | first1=J.-C. |
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| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) |
| 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> |
| publisher=[[SIMBAD]] | date=1986 | bibcode=1986EgUBV........0M | postscript=. }}</ref> |
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| first22=A. | last22=Roberge |
| first22=A. | last22=Roberge |
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| title=Exocomet signatures around the A-shell star Φ Leo? |
| 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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| publisher=[[Cornell University]] | work=arXiv.org |
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| date=September 14, 2016 |
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| arxiv=1609.04263 | postscript=. |doi = 10.1051/0004-6361/201629514 |bibcode = 2016A&A...594L...1E | url=http://orbi.ulg.ac.be/bitstream/2268/204875/1/aa29514-16.pdf}}</ref> |
| arxiv=1609.04263 | postscript=. |doi = 10.1051/0004-6361/201629514 |bibcode = 2016A&A...594L...1E | url=http://orbi.ulg.ac.be/bitstream/2268/204875/1/aa29514-16.pdf}}</ref> |
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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
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 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,[10] 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.[11]
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.[10]
{{cite web}}
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