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{{Short description|Star in the constellation Aquila}} |
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{{Starbox begin |
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| name = 70 Aquilae |
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}} |
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{{Starbox observe |
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| epoch = J2000 |
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| constell = [[Aquila (constellation)|Aquila]] |
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| ra = {{RA|20|36|43.63394}}<ref name=GaiaDR2/> |
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| dec = {{DEC|-02|32|59.8341}}<ref name=GaiaDR2/> |
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| appmag_v = 4.903<ref name=Hohle2010/> |
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}} |
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{{Starbox character |
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| type = |
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| class = {{nowrap|K4+ III Ba1}},<ref name=perkins1989/> K3 III,<ref name=Houk1999/> or K5 II<ref name=Hoffleit1991/> |
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| b-v = {{Val|1.606|0.041}}<ref name=Anderson2012/> |
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| u-b = |
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| variable = |
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}} |
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{{Starbox astrometry |
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| radial_v = {{Val|−9.4|0.4}}<ref name=Gontcharov2006/> |
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| prop_mo_ra = +10.124<ref name=GaiaDR2/> |
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| prop_mo_dec = –15.604<ref name=GaiaDR2/> |
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| parallax = 3.4533 |
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| p_error = 0.3160 |
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| parallax_footnote = <ref name=GaiaDR2/> |
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| absmag_v = −3.05<ref name=Anderson2012/> |
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}} |
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{{Starbox detail |
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| source = |
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| mass = {{Val|6.2|0.6}}<ref name=Tetzlaff2011/> |
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| radius = 102<ref name=lang2006/> |
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| luminosity_bolometric = 4,072<ref name=Hohle2010/> |
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| temperature = 3,900<ref name=Hohle2010/> |
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| metal_fe = {{Val|−0.294|0.093}}<ref name=Taylor1999/> |
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| gravity = 1.9<ref name=Souza2005/> |
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| rotational_velocity = 1.9<ref name=Souza2005/> |
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| age_myr = {{Val|63.1|17.8}}<ref name=Tetzlaff2011/> |
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}} |
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{{Starbox catalog |
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| names = {{odlist | F=70 Aql | BD=−03° 496 | FK5=3648 | HD=196321 | HIP=101692 | HR=7873 | SAO=144624 }}<ref name=SIMBAD/> |
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}} |
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{{Starbox reference |
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| Simbad = 70+Aql |
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}} |
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{{Starbox end}} |
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'''70 Aquilae''', abbreviated '''70 Aql''', is a single<ref name=Eggleton2008/> orange-hued [[star]] in the equatorial [[constellation]] of [[Aquila (constellation)|Aquila]]. ''70 Aquilae'' is its [[Flamsteed designation]]. It is visible to the naked eye with an [[apparent visual magnitude]] of 4.90.<ref name=Hohle2010/> The distance to 70 Aquilae, as determined from its annual [[stellar parallax|parallax shift]] of {{Val|3.5|ul=mas}},<ref name=GaiaDR2/> is around 940 [[light year]]s. The star is moving closer to the Earth with a heliocentric [[radial velocity]] of −9 km/s.<ref name=Gontcharov2006/> |
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{{star-stub}} |
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[[Category:Aquila constellation]] |
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==Classification== |
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Perkins et al. (1989) found a [[stellar classification]] of {{nowrap|K4+ III Ba1}}<ref name=perkins1989/> for this star, suggesting it is a [[K-type star|K-type]] [[giant star|giant]] with [[barium star|abundance anomaly of barium]].<ref name=gomez1997>{{citation |
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| last1=Gomez | first1=A. E. | last2=Luri | first2=X. |
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| last3=Grenier | first3=S. | last4=Prevot | first4=L. |
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| last5=Mennessier | first5=M. O. | last6=Figueras | first6=F. |
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| last7=Torra | first7=J. | display-authors=1 |
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| title=Absolute magnitudes and kinematics of barium stars |
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| journal=Astronomy and Astrophysics |
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| volume=319 | pages=881 | year=1997 |
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| bibcode=1997A&A...319..881G | postscript=. }}</ref> Houk and Swift (1999) matched an ordinary giant with a class of K3 III.<ref name=Houk1999/> Many sources<ref name=Hohle2010/><ref name=Tetzlaff2011/><ref name=Eggleton2008/><ref name=Souza2005/><ref name=gomez1997/> still use the 1991 [[Bright Star Catalogue]] classification of K5 II,<ref name=Hoffleit1991/> which instead suggests a [[bright giant star]]. |
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==Size and temperature== |
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The [[interferometry]]-measured [[angular diameter]] of this star, after correcting for [[limb darkening]], is {{Val|3.27|0.04|u=mas}},<ref name=Richichi2005/> which, at its estimated distance, equates to a physical radius of roughly 102 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> 70 Aquilae is about 63 million years old with 6 times the [[mass of the Sun]].<ref name=Tetzlaff2011/> It is radiating 4,072<ref name=Hohle2010/> times the [[Sun's luminosity]] from its enlarged [[photosphere]] at an [[effective temperature]] of 3,900 K.<ref name=Hohle2010/> |
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==References== |
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{{reflist|refs= |
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<ref name=SIMBAD>{{cite simbad | title=69 Aql | access-date=November 1, 2018 }}</ref> |
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<ref name=GaiaDR2>{{cite DR2}}</ref> |
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<ref name=Anderson2012>{{citation |
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| title=XHIP: An extended hipparcos compilation |
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| last1=Anderson | first1=E. | last2=Francis | first2=Ch. |
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| journal=Astronomy Letters |
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| volume=38 | issue=5 | pages=331 | year=2012 |
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| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 |
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| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}</ref> |
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<ref name=perkins1989>{{citation |
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| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C. |
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| title=The Perkins catalog of revised MK types for the cooler stars |
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| journal=Astrophysical Journal Supplement Series |
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| volume=71 | pages=245 | year=1989 | postscript=. |
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| bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}</ref> |
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<ref name=Tetzlaff2011>{{citation |
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| last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. |
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| last3=Hohle | first3=M. M. | display-authors=1 |
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| title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun |
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| journal=Monthly Notices of the Royal Astronomical Society |
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| volume=410 | issue=1 | pages=190–200 | year=2011 |
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| bibcode=2011MNRAS.410..190T | arxiv=1007.4883 |
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| doi=10.1111/j.1365-2966.2010.17434.x | s2cid=118629873 | postscript=. }}</ref> |
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<ref name=Hohle2010>{{citation |
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| last1=Hohle | first1=M. M. | last2=Neuhäuser | first2=R. |
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| last3=Schutz | first3=B. F. | display-authors=1 |
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| title=Masses and luminosities of O- and B-type stars and red supergiants |
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| journal=Astronomische Nachrichten |
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| volume=331 | issue=4 | page=349 | date=April 2010 |
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| bibcode=2010AN....331..349H | arxiv=1003.2335 |
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| doi=10.1002/asna.200911355 | s2cid=111387483 | postscript=. }}</ref> |
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<ref name=Eggleton2008>{{citation |
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| title=A catalogue of multiplicity among bright stellar systems |
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| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. |
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| journal =Monthly Notices of the Royal Astronomical Society |
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| volume=389 | issue=2 | pages=869 | date=2008 |
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| doi=10.1111/j.1365-2966.2008.13596.x | postscript=. |
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| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}</ref> |
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<ref name=Richichi2005>{{citation |
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| last1=Richichi | first1=A. | last2=Percheron | first2=I. |
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| last3=Khristoforova | first3=M. | display-authors=1 |
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| title=CHARM2: An updated Catalog of High Angular Resolution Measurements |
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| journal=Astronomy and Astrophysics | postscript=. |
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| volume=431 | issue=2 | pages=773–777 | date=February 2005 |
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| doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | doi-access=free }}</ref> |
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<ref name=lang2006>{{citation |
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| first1=Kenneth R. | last1=Lang |
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| title=Astrophysical formulae | volume=1 |
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| series=Astronomy and astrophysics library |
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| edition=3rd | publisher=[[Birkhäuser]] |
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| date=2006 | isbn=3-540-29692-1 | postscript=. |
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| url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 |
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}} The radius (R<sub>*</sub>) is given by: |
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:<math>\begin{align} 2\cdot R_* |
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& = \frac{(289.6\cdot 3.27\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ |
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& \approx 204\cdot R_{\bigodot} |
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\end{align}</math></ref> |
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<ref name=Houk1999>{{citation |
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| last1=Houk | first1=N. | last2=Swift | first2=C. |
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| title=Michigan catalogue of two-dimensional spectral types for the HD Stars |
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| journal=Michigan Spectral Survey |
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| volume=5 | year=1999 | postscript=. |
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| bibcode=1999MSS...C05....0H }}</ref> |
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<ref name=Souza2005>{{citation |
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| title=Gravitational-darkening of Altair from interferometry |
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| last1=Domiciano de Souza | first1=A. | last2=Kervella | first2=P. |
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| last3=Jankov | first3=S. | last4=Vakili | first4=F. |
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| last5=Ohishi | first5=N. | last6=Nordgren | first6=T. E. |
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| last7=Abe | first7=L. | display-authors=1 |
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| journal=Astronomy and Astrophysics | postscript=. |
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| volume=442 | issue=2 | date=November 2005 | pages=567–578 |
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| doi=10.1051/0004-6361:20042476 | bibcode=2005A&A...442..567D | doi-access=free }}</ref> |
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<ref name=Hoffleit1991>{{citation |
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| title=The Bright Star Catalogue | year=1991 |
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| edition=5th Revised | publisher=Astronomical Data Center, NSSDC/ADC |
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| first1=D. | last1=Hoffleit | first2=W. H. | last2=Warren, Jr. |
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| journal=New Haven |
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| bibcode=1964cbs..book.....H }}</ref> |
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<ref name=Gontcharov2006>{{citation |
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| last1=Gontcharov | first1=G. A. |
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| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system |
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| journal=Astronomy Letters |
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| volume=32| issue=11| pages=759–771| date=November 2006 |
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| doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G |
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| arxiv=1606.08053 | s2cid=119231169 |
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| postscript=. }}</ref> |
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<ref name=Taylor1999>{{citation |
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| last1=Taylor | first1=B. J. | postscript=. |
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| title=Catalogs of temperatures and [Fe/H] averages for evolved G and K stars |
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| journal=Astronomy and Astrophysics Supplement |
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| volume=134 | issue=3 | pages=523–524 | date=February 1999 |
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| doi=10.1051/aas:1999153 | bibcode=1999A&AS..134..523T | doi-access=free }}</ref> |
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<!-- Not in use |
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<ref name=gomez1997>{{citation |
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| last1=Gomez | first1=A. E. | last2=Luri | first2=X. |
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| last3=Grenier | first3=S. | last4=Prevot | first4=L. |
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| last5=Mennessier | first5=M. O. | last6=Figueras | first6=F. |
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| last7=Torra | first7=J. | display-authors=1 |
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| title=Absolute magnitudes and kinematics of barium stars |
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| journal=Astronomy and Astrophysics |
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| volume=319 | pages=881 | year=1997 |
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| bibcode=1997A&A...319..881G | postscript=. }}</ref> |
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Not in use--> |
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}} |
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{{Stars of Aquila}} |
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{{DEFAULTSORT:70 Aquilae}} |
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[[Category:K-type giants]] |
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[[Category:Aquila (constellation)]] |
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[[Category:Durchmusterung objects]] |
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[[Category:Flamsteed objects|Aquilae, 70]] |
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[[Category:Henry Draper Catalogue objects|196321]] |
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[[Category:Hipparcos objects|101692]] |
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[[Category:Bright Star Catalogue objects|7873]] |
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Aquila |
Right ascension | 20h36m 43.63394s[1] |
Declination | −02° 32′ 59.8341″[1] |
Apparent magnitude (V) | 4.903[2] |
Characteristics | |
Spectral type | K4+ III Ba1,[3] K3 III,[4] or K5 II[5] |
B−V color index | 1.606±0.041[6] |
Astrometry | |
Radial velocity (Rv) | −9.4±0.4[7] km/s |
Proper motion (μ) | RA: +10.124[1] mas/yr Dec.: –15.604[1] mas/yr |
Parallax (π) | 3.4533 ± 0.3160 mas[1] |
Distance | 940 ± 90 ly (290 ± 30 pc) |
Absolute magnitude (MV) | −3.05[6] |
Details | |
Mass | 6.2±0.6[8] M☉ |
Radius | 102[9] R☉ |
Luminosity (bolometric) | 4,072[2] L☉ |
Surface gravity (log g) | 1.9[10] cgs |
Temperature | 3,900[2] K |
Metallicity [Fe/H] | −0.294±0.093[11] dex |
Rotational velocity (v sin i) | 1.9[10] km/s |
Age | 63.1±17.8[8] Myr |
Other designations | |
70 Aql, BD−03° 496, FK5 3648, HD 196321, HIP 101692, HR 7873, SAO 144624[12] | |
Database references | |
SIMBAD | data |
70 Aquilae, abbreviated 70 Aql, is a single[13] orange-hued star in the equatorial constellationofAquila. 70 Aquilae is its Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.90.[2] The distance to 70 Aquilae, as determined from its annual parallax shiftof3.5 mas,[1] is around 940 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[7]
Perkins et al. (1989) found a stellar classificationofK4+ III Ba1[3] for this star, suggesting it is a K-type giant with abundance anomaly of barium.[14] Houk and Swift (1999) matched an ordinary giant with a class of K3 III.[4] Many sources[2][8][13][10][14] still use the 1991 Bright Star Catalogue classification of K5 II,[5] which instead suggests a bright giant star.
The interferometry-measured angular diameter of this star, after correcting for limb darkening, is 3.27±0.04 mas,[15] which, at its estimated distance, equates to a physical radius of roughly 102 times the radius of the Sun.[9] 70 Aquilae is about 63 million years old with 6 times the mass of the Sun.[8] It is radiating 4,072[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,900 K.[2]
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