70 Aquilae

Star in the constellation Aquila

70 Aquilae  Observation data
Epoch J2000 Equinox J2000

Constellation | Aquila
Right ascension | 20h 36m 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 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]

## Classification

[edit]

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.

## Size and temperature

[edit]

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

[edit]

1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
2. ^ a b c d e f g Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483.
3. ^ 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.
4. ^ 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.
5. ^ a b Hoffleit, D.; Warren, Jr., W. H. (1991), "The Bright Star Catalogue", New Haven (5th Revised ed.), Astronomical Data Center, NSSDC/ADC, Bibcode:1964cbs..book.....H
6. ^ 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, S2CID 119257644.
7. ^ 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, S2CID 119231169.759-771&rft.date=2006-11&rft_id=info:arxiv/1606.08053&rft_id=https://api.semanticscholar.org/CorpusID:119231169#id-name=S2CID&rft_id=info:doi/10.1134/S1063773706110065&rft_id=info:bibcode/2006AstL...32..759G&rft.aulast=Gontcharov&rft.aufirst=G.+A.&rfr_id=info:sid/en.wikipedia.org:70+Aquilae" class="Z3988">
8. ^ 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 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.190-200&rft.date=2011&rft_id=info:arxiv/1007.4883&rft_id=https://api.semanticscholar.org/CorpusID:118629873#id-name=S2CID&rft_id=info:doi/10.1111/j.1365-2966.2010.17434.x&rft_id=info:bibcode/2011MNRAS.410..190T&rft.aulast=Tetzlaff&rft.aufirst=N.&rft.au=Neuhäuser,+R.&rft.au=Hohle,+M.+M.&rfr_id=info:sid/en.wikipedia.org:70+Aquilae" class="Z3988">
9. ^ 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}}}
10. ^ 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:10.1051/0004-6361:20042476.567-578&rft.date=2005-11&rft_id=info:doi/10.1051/0004-6361:20042476&rft_id=info:bibcode/2005A&A...442..567D;&rft.aulast=Domiciano+de+Souza&rft.aufirst=A.&rft.au=Kervella,+P.&rft.au=Jankov,+S.&rft.au=Vakili,+F.&rft.au=Ohishi,+N.&rft.au=Nordgren,+T.+E.&rft.au=Abe,+L.&rfr_id=info:sid/en.wikipedia.org:70+Aquilae" class="Z3988">
11. ^ Taylor, B. J. (February 1999), "Catalogs of temperatures and [Fe/H] averages for evolved G and K stars", Astronomy and Astrophysics Supplement, 134 (3): 523–524, Bibcode:1999A&AS..134..523T, doi:10.1051/aas:1999153.523-524&rft.date=1999-02&rft_id=info:doi/10.1051/aas:1999153&rft_id=info:bibcode/1999A&AS..134..523T;&rft.aulast=Taylor&rft.aufirst=B.+J.&rfr_id=info:sid/en.wikipedia.org:70+Aquilae" class="Z3988">
12. ^ "69 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 1, 2018.
13. ^ 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, S2CID 14878976.
14. ^ 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.
15. ^ 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:10.1051/0004-6361:20042039.773-777&rft.date=2005-02&rft_id=info:doi/10.1051/0004-6361:20042039&rft_id=info:bibcode/2005A&A...431..773R;&rft.aulast=Richichi&rft.aufirst=A.&rft.au=Percheron,+I.&rft.au=Khristoforova,+M.&rfr_id=info:sid/en.wikipedia.org:70+Aquilae" class="Z3988">

* v
* t
* e

Constellation of Aquila

* Aquila in Chinese astronomy
* List of stars in Aquila

Stars|

| Bayer|

* α (Altair)
* β (Alshain)
* γ (Tarazed)
* δ
* ε
* ζ (Okab)
* η
* θ (Antinous)
* ι
* κ
* λ
* μ
* ν
* ξ (Libertas)
* ο
* π
* σ
* τ (Tianfu)
* υ
* φ
* χ
* ψ
* ω1
* ω2
* A
* b
* c
* d
* e
* f
* g
* h
* i
* k
* l

|

Flamsteed|

* 4
* 5
* 7
* 8
* 10
* 11
* 18
* 19
* 20
* 21
* 22
* 23
* 24
* 42
* 45
* 46
* 51
* 56
* 57
* 58
* 62
* 64
* 66
* 68
* 69
* 70
* 14 Sge
* 62 Ser
* 64 Sgr

Variable|

* R
* U
* V
* W
* TT
* FF
* QS
* V368
* V450
* V500
* V603
* V604
* V605
* V606
* V923
* V1286
* V1291
* V1298
* V1302
* V1315
* V1333
* V1339
* V1427
* V1428
* V1429
* V1472
* V1487
* V1494
* V1654
* V1672
* V1691
* V1703 (Phoenicia)
* V1828
* V1936

HR|

* 7099
* 7143
* 7288
* 7300
* 7307
* 7396
* 7456
* 7569
* 7598
* 7599
* 7693
* 7717
* 7803

HD|

* 179079
* 183263
* 187734
* 192699 (Chechia)

Other|

* CoRoT-2
* CoRoT-3
* CoRoT-8
* Gaia BH3
* HAT-P-41
* PSR J1856+0245
* PSR J1903+0327
* PSR B1913+16 (Hulse–Taylor)
* PSR J1951+1123
* SGR 1900+14
* SS 433
* W43A
* W49-2
* WASP-80 (Petra)
* WD J1953−1019
* ZTF J1901+1458

| Exoplanets|

* CoRoT-2b
* CoRoT-3b
* CoRoT-8b
* CoRoT-10b
* HD 179079 b
* HD 183263 b
* c
* HD 192263 b
* HD 192699 b
* ξ Aquilae b

|

| Star clusters|

* NGC 6709
* NGC 6738
* NGC 6755
* NGC 6756
* NGC 6760

|

Nebulae|

| NGC|

* 6741
* 6751
* 6778
* 6781
* 6790

|

Other|

* Abell 48
* Abell 70
* E Nebula
* Hen 2-428
* HESS J1857+026
* Kesteven 75
* Smith's Cloud
* W43
* W49
* W49B
* W50

Galaxies|

| NGC|

* 6814

|

Other|

* IC 1327

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
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