28 Vulpeculae

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28 Vulpeculae
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Vulpecula
Right ascension 20h 38m 31.9139s [1]
Declination +24° 06′ 57.4433″ [1]
Apparent magnitude  (V)5.05 [2]
Characteristics
Evolutionary stage Subgiant
Spectral type B5IV [3]
U−B color index −0.53 [4]
B−V color index −0.14 [4]
Astrometry
Radial velocity (Rv)−22.6±1.2 [5] km/s
Proper motion (μ)RA: 10.317±0.273 [1] mas/yr
Dec.: −6.940±0.253 [1] mas/yr
Parallax (π)5.8740±0.1760  mas [1]
Distance 560 ± 20  ly
(170 ± 5  pc)
Absolute magnitude  (MV)−0.96 [5]
Details
Mass 5.0 [2]   M☉
Luminosity 713 [2]   L☉
Surface gravity (log g)3.77 [6]   cgs
Temperature 15,200 [2]   K
Metallicity [Fe/H]+0.02±0.04 [6]   dex
Rotational velocity (v sin i)285 [7]  km/s
Other designations
28 Vul, BD+23°4084, HD 196740, HIP 101868, HR 7894, SAO 88945 [8]
Database references
SIMBAD data

28 Vulpeculae is a single [9] star in the northern constellation of Vulpecula. It lies approximately 560 light years away and is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.047. [2] The star is moving closer to the Sun with a heliocentric radial velocity of −23 km/s, and may come as close as 198 light-years in 5.9 million years. [5]

This is a subgiant star with a spectral class of B5 IV, [3] indicating a hot massive star that has started to evolve away from the main sequence after exhausting it core hydrogen. It has been included in a list of the least variable stars observed with the Hipparcos satellite; its brightness varied by no more than 0.0005 magnitudes in the Hipparcos passband. [10] The star has five [2] times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 285 km/s. [7] It is radiating 713 times the Sun's luminosity from its photosphere at an effective temperature of 15,200 K. [2]

References

  1. 1 2 3 4 5 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. 1 2 3 4 5 6 7 Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (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. 1 2 Lesh, Janet Rountree (1968). "The Kinematics of the Gould Belt: An Expanding Group?". The Astrophysical Journal Supplement Series. 17: 371. Bibcode:1968ApJS...17..371L. doi: 10.1086/190179 .
  4. 1 2 Hoffleit, Dorrit; Jaschek, Carlos (1991). "The Bright star catalogue". New Haven, Conn.: Yale University Observatory, 5th Rev.ed. Bibcode:1991bsc..book.....H.
  5. 1 2 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.
  6. 1 2 Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2011). "Coudé-feed stellar spectral library - atmospheric parameters". Astronomy and Astrophysics. 525: A71. arXiv: 1009.1491 . Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. S2CID   53480665.
  7. 1 2 Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359. Bibcode:2002ApJ...573..359A. doi: 10.1086/340590 .
  8. ↑ "28 Vulpeculae". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-11-17.
  9. ↑ 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.
  10. ↑ Adelman, S. J. (2001). "Research Note Hipparcos photometry: The least variable stars". Astronomy and Astrophysics. 367: 297–298. Bibcode:2001A&A...367..297A. doi: 10.1051/0004-6361:20000567 .
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