27 Vulpeculae

27 Vulpeculae is a single,[10] blue-white star in the northern constellation of Vulpecula. It is a dim star, visible to the naked eye, with an apparent visual magnitude of 5.59.[2] An annual parallax shift of 10.6692±0.0483 mas[1] provides a distance estimate of about 306 light years. It is moving closer with a heliocentric radial velocity of −22 km/s,[6] and will make perihelion passage at a distance of around 119 ly (36.56 pc) in 3.75 million years.[5]

27 Vulpeculae
27 Vulpeculae in the constellation Vulpecula.
Observation data
Epoch J2000      Equinox J2000
Constellation Vulpecula
Right ascension 20h 37m 04.6724s[1]
Declination +26° 27′ 43.006″[1]
Apparent magnitude (V) 5.590[2]
Characteristics
Spectral type B9 V[3][4]
B−V color index −0.050±0.004[5]
Astrometry
Radial velocity (Rv)−21.8±4.3[6] km/s
Proper motion (μ) RA: 15.349±0.042[1] mas/yr
Dec.: −11.775±0.040[1] mas/yr
Parallax (π)10.6692 ± 0.0483[1] mas
Distance306 ± 1 ly
(93.7 ± 0.4 pc)
Absolute magnitude (MV)0.65[5]
Details
Mass2.77±0.03[4] M☉
Radius3.1[7] R☉
Luminosity75.0+4.8
−4.5[4] L☉
Surface gravity (log g)3.781[8] cgs
Temperature10,789+50
−49[4] K
Metallicity [Fe/H]−0.27±0.04[5] dex
Rotational velocity (v sin i)335[4] km/s
Other designations
27 Vul, BD+25° 4302, FK5 3649, HD 196504, HIP 101716, HR 7880, SAO 88903[9]
Database references
SIMBADdata

This is a B-type main-sequence star with a stellar classification of B9 V.[3] It is spinning rapidly, showing a projected rotational velocity of 335.[4] The star has an estimated 2.77[4] times the mass of the Sun and about 3.1[7] times the Sun's radius. It is radiating 75[4] times the Sun's luminosity from its photosphere at an effective temperature of 10,789 K.[4]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics (in press). arXiv:2012.01533. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  2. Paunzen, E. (2015), "A new catalogue of Strömgren-Crawford uvbyβ photometry", Astronomy & Astrophysics, 580: A23, arXiv:1506.04568, Bibcode:2015A&A...580A..23P, doi:10.1051/0004-6361/201526413.
  3. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
  4. Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  5. 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.
  6. Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  7. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (Third ed.), 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. Huang, W.; Gies, D. R. (August 2008), "Stellar Rotation in Field and Cluster B Stars", The Astrophysical Journal, 683 (2), arXiv:0805.2133, Bibcode:2008ApJ...683.1045H, doi:10.1086/590106, 1045–1051.
  9. "27 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-21.
  10. 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.
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