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( d i f f ) ← P r e v i o u s r e v i s i o n | L a t e s t r e v i s i o n ( d i f f ) | N e w e r r e v i s i o n → ( d i f f )
70 Aquilae
Observation dataEpoch J2000 Equinox J2000
Constellation
Aquila
Right ascension
20 h 36 m 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 (R v ) −9.4± 0.4[7] km/sProper 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 (M V )−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 constellation of Aquila . 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 shift of 3.5 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 classification of K4+ 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]
References
^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series , 71 : 245, Bibcode :1989ApJS...71..245K , doi :10.1086/191373 .
^ a b Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey , 5 , Bibcode :1999MSS...C05....0H .
^ a b Hoffleit, D.; Warren, Jr., W. H. (1991), The Bright Star Catalogue (5th Revised ed.), Astronomical Data Center, NSSDC/ADC, Bibcode :1964BS....C......0H
^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5 ): 331, arXiv :1108.4971 , Bibcode :2012AstL...38..331A , doi :10.1134/S1063773712050015 .
^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters , 32 (11 ): 759–771, arXiv :1606.08053 , Bibcode :2006AstL...32..759G , doi :10.1134/S1063773706110065 .
^ a b c d Tetzlaff, N.; et al. (2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society , 410 : 190, arXiv :1007.4883 , Bibcode :2011MNRAS.410..190T , doi :10.1111/j.1365-2966.2010.17434.x .
^ a b Lang, Kenneth R. (2006), Astrophysical formulae , Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser , ISBN 3-540-29692-1 . The radius (R * ) is given by:
2
⋅
R
∗
=
(
289.6
⋅
3.27
⋅
10
−
3
)
AU
0.0046491
AU
/
R
⨀
≈
204
⋅
R
⨀
{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(289.6\cdot 3.27\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 204\cdot R_{\bigodot }\end{aligned}}}
^ a b c Domiciano de Souza, A.; et al. (November 2005), "Gravitational-darkening of Altair from interferometry", Astronomy and Astrophysics , 442 (2 ): 567–578, Bibcode :2005A&A...442..567D , doi :10.1051/0004-6361:20042476 .
^ Taylor, B. J. (February 1999), "Catalogs of temperatures and [Fe/H] averages for evolved G and K stars", Astronomy and Astrophysics Supplement , 134 : 523–524, Bibcode :1999A&AS..134..523T , doi :10.1051/aas:1999153 .
^ "69 Aql" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 1, 2018 .
^ a b Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2 ): 869, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x .
^ a b Gomez, A. E.; et al. (1997), "Absolute magnitudes and kinematics of barium stars", Astronomy and Astrophysics , 319 : 881, Bibcode :1997A&A...319..881G .
^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics , 431 (2 ): 773–777, Bibcode :2005A&A...431..773R , doi :10.1051/0004-6361:20042039 .
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=70_Aquilae&oldid=867475858 "
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