10 Vulpeculae

10 Vulpeculae is an astrometric binary[7] star system in the northern constellation of Vulpecula. It is faintly visible to the naked eye with an apparent visual magnitude of 5.497.[2] The system is located roughly 330 light years from the Sun, as determined from an annual parallax shift of 9.83±0.49 mas.[1] It is moving closer to the Sun with a heliocentric radial velocity of −9.9 km/s.[2]

10 Vulpeculae
Observation data
Epoch J2000      Equinox J2000
Constellation Vulpecula
Right ascension 19h 43m 42.92539s[1]
Declination +25° 46′ 18.9293″[1]
Apparent magnitude (V) 5.497[2]
Characteristics
Spectral type G8 III[2]
B−V color index 0.923[2]
Astrometry
Radial velocity (Rv)−9.9[2] km/s
Proper motion (μ) RA: +12.01[1] mas/yr
Dec.: +21.44[1] mas/yr
Parallax (π)9.83 ± 0.49 mas[1]
Distance330 ± 20 ly
(102 ± 5 pc)
Absolute magnitude (MV)0.47[3]
Details
Mass2.35[2] M☉
Radius13[4] R☉
Luminosity72[2] L☉
Surface gravity (log g)3.08[5] cgs
Temperature5,008±33[2] K
Metallicity [Fe/H]−0.11[5] dex
Age1.15[2] Gyr
Other designations
10 Vul, BD+25° 3933, FK5 1515, HD 186486, HIP 97077, HR 7506, SAO 87633[6]
Database references
SIMBADdata

The system is a source of X-ray emission.[8] The visible component is an aging giant star with a stellar classification of G8 III.[2] At the age of 1.15 billion years,[2] it has exhausted the hydrogen at its core region and expanded off the main sequence. It is about 13[4] times the Sun's radius and 2.35[2] times the Sun's mass. The star is radiating 72[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,008 K.[2]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114, 88.
  3. 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.
  4. Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754
  5. Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
  6. "10 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-13.
  7. Eggleton, P. P.; Tokovinin, A. A. (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, S2CID 14878976.
  8. Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.
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