27 Vulpeculae
| 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 mas[1] |
| Distance | 306 ± 1 ly (93.7 ± 0.4 pc) |
| Absolute magnitude (MV) | 0.65[5] |
| Details | |
| Mass | 2.77±0.03[4] M☉ |
| Radius | 3.1[7] R☉ |
| Luminosity | 75.0+4.8 −4.5[4] L☉ |
| Surface gravity (log g) | 3.781[8] cgs |
| Temperature | 10,789+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 | |
| SIMBAD | data |
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]
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]
BD Vulpeculae
The location of the reddish colored carbon star BD Vulpeculae (CCCS 2916 / CGCS 4915) is, as seen from Earth, immediately northeast of 27 Vulpeculae. Astronomers and amateur astronomers could use 27 Vulpeculae as guidestar to try to find BD Vulpeculae and to see the color contrast of the bluish white star 27 Vulpeculae and the nearby reddish carbon star.
References
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b 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, S2CID 73623700.
- ^ a b 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
- ^ a b c d e f g h i 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, S2CID 55586789.
- ^ a b c d 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 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, S2CID 119231169.
- ^ a b Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics, 367 (Third ed.): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ Huang, W.; Gies, D. R. (August 2008), "Stellar Rotation in Field and Cluster B Stars", The Astrophysical Journal, 683 (2): 1045–1051, arXiv:0805.2133, Bibcode:2008ApJ...683.1045H, doi:10.1086/590106, S2CID 18926523, 1045–1051.
- ^ "27 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-21.
- ^ 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.
External links
- 27 Vulpeculae on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images