HD 117566

Last updated
HD 117566
Ursa Minor constellation map.svg
Red circle.svg
Location of HD 117566 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 13h 26m 56.80348s [1]
Declination +78° 38′ 37.9324″ [1]
Apparent magnitude  (V)5.74±0.01 [2]
Characteristics
Evolutionary stage Hertzsprung gap [3] or horizontal branch [4]
Spectral type G3 IIIb Fe−1 CH1 [5]
U−B color index +0.35 [6]
B−V color index +0.77 [6]
Astrometry
Radial velocity (Rv)13.7±0.3 [7]  km/s
Proper motion (μ)RA: −140.497  mas/yr [1]
Dec.: +30.403  mas/yr [1]
Parallax (π)11.1974 ± 0.0417  mas [1]
Distance 291 ± 1  ly
(89.3 ± 0.3  pc)
Absolute magnitude  (MV)+1.03 [8]
Details
Mass 2.29 [9]   M☉
Radius 7.2±0.4 [10]   R☉
Luminosity 38.2±0.3 [1]   L☉
Surface gravity (log g)3.69±0.18 [11]   cgs
Temperature 5,420±26 [12]   K
Metallicity [Fe/H]+0.03 [11]   dex
Rotational velocity (v sin i)8.9±1 [13]  km/s
Age 760±50 [7]   Myr
Other designations
AG+78°340, BD+79°422, FK5  3075, GC  18223, HD  117566, HIP  65595, HR  5091, SAO  7821 [14]
Database references
SIMBAD data

HD 117566, also known as HR 5091, is a solitary yellow-hued star [15] located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.74, [2] making it faintly visible to the naked eye. This object is relatively close at a distance of 291 light years based on Gaia DR3 parallax measurements but is receding with a heliocentric radial velocity of 14  km/s . [7] At its current distance, HD 117566's brightness is diminished by 0.12 magnitudes due to interstellar dust. [16]

HD 117566 has a stellar classification of G3 IIIb Fe−1 CH1, [5] indicating that it is a G-type giant with an under-abundance of iron and an overabundance of the CH radical in its spectrum. Its evolutionary stage is unclear. A 1994 paper places it in the Hertzsprung gap, [3] indicating it has ceased hydrogen core fusion and is now evolving toward the red giant branch (RGB). However, Mishenina et al. (2006) said that HD 117566 is already past the RGB and is on the horizontal branch, fusing helium at its core. [4] Nevertheless, it has 2.29 times the mass of the Sun [9] and, at the age of 760 million years, [7] it has expanded to 7.2 times the Sun's radius. [10] It radiates 38.2 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 5,420  K . [12] HD 117566 has a solar metallicity [11] and spins modestly with a projected rotational velocity of 9  km/s . [13]

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<span class="mw-page-title-main">Q Scorpii</span> High proper motion binary star system in the constellation of Scorpius

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<span class="mw-page-title-main">HD 27022</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">HD 76236</span> Star in the constellation Chamaeleon

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<span class="mw-page-title-main">Lambda Doradus</span> Star in the constellation of Dorado

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<span class="mw-page-title-main">HD 40091</span> Star in the constellation Columba

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<span class="mw-page-title-main">HD 196737</span> K-type giant; Microscopium

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<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

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<span class="mw-page-title-main">HD 31134</span> Star in the constellation of Camelopardalis

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<span class="mw-page-title-main">HD 201852</span> K-type giant star; Microscopium.

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References

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  8. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  9. 1 2 Liu, Y. J.; Tan, K. F.; Wang, L.; Zhao, G.; Sato, Bun'ei; Takeda, Y.; Li, H. N. (31 March 2014). "The Lithium Abundances of a Large Sample of Red Giants". The Astrophysical Journal. 785 (2): 94. arXiv: 1404.1687 . Bibcode:2014ApJ...785...94L. doi: 10.1088/0004-637X/785/2/94 . eISSN   1538-4357. ISSN   0004-637X.
  10. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361.
  11. 1 2 3 da Silva, Ronaldo; Milone, André de C.; Rocha-Pinto, Helio J. (August 2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy and Astrophysics. 580: A24. Bibcode:2015A&A...580A..24D. doi: 10.1051/0004-6361/201525770 . ISSN   0004-6361.
  12. 1 2 Strassmeier, K.G.; Schordan, P. (December 2000). "A temperature calibration for MK-class III giants from high-resolution spectral line-depth ratios". Astronomische Nachrichten. 321 (5–6): 277–305. Bibcode:2000AN....321..277S. doi:10.1002/1521-3994(200012)321:5/6<277::AID-ASNA277>3.0.CO;2-H. eISSN   1521-3994. ISSN   0004-6337.
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  14. ↑ "HD 117566". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved December 16, 2022.
  15. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . eISSN   1365-2966. ISSN   0035-8711.
  16. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711.
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