Star in the constellation Vulpecula
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 |
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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] |
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Details |
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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 |
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Other designations |
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Database references |
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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
- ^ a b c d e 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.
- ^ a b c d e f g 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.
- ^ a b 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.
- ^ a b Hoffleit, Dorrit; Jaschek, Carlos (1991). "The Bright star catalogue". New Haven, Conn.: Yale University Observatory, 5th Rev.ed. Bibcode:1991bsc..book.....H.
- ^ a b c 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.
- ^ a b 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.
- ^ a b 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.
- ^ "28 Vulpeculae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-11-17.
- ^ 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.
- ^ 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.
Constellation of Vulpecula
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Stars | Bayer | |
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Flamsteed | |
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Variable | |
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HR | - 7207
- 7250
- 7263
- 7286
- 7364
- 7384
- 7391
- 7421
- 7452
- 7472
- 7490
- 7540
- 7556
- 7573
- 7601
- 7656
- 7716
- 7760
- 7811
- 7849
- 7862
- 7895
- 7903
- 8082
- 8158
- 8190
- 8194
- 8197
- 8198
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