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8 Vulpeculae

8 Vulpeculae

α and 8 Vulpeculae form a pair at top center
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vulpecula
Right ascension 19h 28m 57.08327s[1]
Declination 24° 46′ 07.2656″[1]
Apparent magnitude (V) 5.82[2]
Characteristics
Spectral type K0 III[3]
B−V color index 1.023±0.005[2]
Astrometry
Radial velocity (Rv)−28.58±0.20[2] km/s
Proper motion (μ) RA: 8.750[1] mas/yr
Dec.: 16.334[1] mas/yr
Parallax (π)7.1397 ± 0.0739 mas[1]
Distance457 ± 5 ly
(140 ± 1 pc)
Absolute magnitude (MV)−0.16[2]
Details
Mass3.07[4] M☉
Radius13.8+0.2
−0.4[1] R☉
Luminosity100.5±1.3[1] L☉
Surface gravity (log g)2.63[4] cgs
Temperature4,915+71
−30[1] K
Metallicity [Fe/H]+0.11[4] dex
Age324[5] Myr
Other designations
8 Vul, BD+24 3761, HD 183491, HIP 95785, HR 7406, SAO 87267[6]
Database references
SIMBADdata

8 Vulpeculae is star located about 457[1] light years away in the northern constellation of Vulpecula.[6] It lies just 7′ from Alpha Vulpeculae and the two form an optical double.[7] 8 Vulpeculae is visible to the naked eye as a faint, yellow-orange hued star with an apparent visual magnitude of 5.82. It is moving closer to the Earth with a heliocentric radial velocity of −29 km/s.[2]

This is an aging giant star with a stellar classification of K0 III,[3] which indicates it has exhausted the hydrogen supply at its core and evolved away from the main sequence. It is 324[5] million years old with three[4] times the mass of the Sun and has expanded to 14[1] times the Sun's radius. The star is radiating 100[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,915 K.[1]

References

  1. ^ a b c d e f g h i j k l 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. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e 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.
  3. ^ a b Yoss, Kenneth M. (November 1961), "Spectral and Luminosity Classifications and Measurements of the Strength of Cyanogen Absorption for Late-Type Stars from Objective-Prism Spectra.", Astrophysical Journal, 134: 809, Bibcode:1961ApJ...134..809Y, doi:10.1086/147209
  4. ^ a b c d Liu, Y. J.; et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal, 785 (2): 12, arXiv:1404.1687, Bibcode:2014ApJ...785...94L, doi:10.1088/0004-637X/785/2/94, S2CID 119226316, 94.
  5. ^ a b Takeda, Yoichi; et al. (August 2008), "Stellar parameters and elemental abundances of late-G giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781
  6. ^ a b "8 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-11-19.
  7. ^ Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
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