32 Vulpeculae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h 54m 33.63782s[1] |
| Declination | +28° 03′ 27.4632″[1] |
| Apparent magnitude (V) | 5.03[2] (4.99–5.06)[3] |
| Characteristics | |
| Evolutionary stage | giant[4] |
| Spectral type | K4 III[5] |
| B−V color index | 1.480[4] |
| Variable type | suspected[3] |
| Astrometry | |
| Radial velocity (Rv) | +5.7±0.6[2] km/s |
| Proper motion (μ) | RA: −2.525±0.209[1] mas/yr Dec.: −2.277±0.197[1] mas/yr |
| Parallax (π) | 5.3885 ± 0.1260 mas [1] |
| Distance | 610 ± 10 ly (186 ± 4 pc) |
| Absolute magnitude (MV) | −1.76[4] |
| Details | |
| Radius | 54.29+1.69 −3.42[1] R☉ |
| Luminosity | 708.4±19.5[1] L☉ |
| Surface gravity (log g) | 1.74[6] cgs |
| Temperature | 4,041+134 −61[1] K |
| Metallicity [Fe/H] | −0.16[6] dex |
| Rotational velocity (v sin i) | 8.1[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
32 Vulpeculae is a single[8] star located around 610[1] light years away from the Sun in the northern constellation Vulpecula,[7] a few degrees south of the border with Cygnus. It is visible to the naked eye as a faint, orange-hued star with a typical apparent visual magnitude of 5.03.[2] This object is drifting further away from the Earth with a heliocentric radial velocity of +6 km/s.[2]
This is an aging red giant [4] star with a stellar classification of K4 III,[5] having exhausted the supply of hydrogen at its core then expanded to 54[1] times the Sun's radius. It is a suspected variable of unknown type, with a visual magnitude that has been measured ranging from 4.99 down to 5.06.[3] The star is radiating 708[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,041 K.[1]
References
[edit ]- ^ 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.
- ^ 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 c Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ a b c d e Ryon, Jenna; et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific, 121 (882): 842, arXiv:0907.3346 , Bibcode:2009PASP..121..842R, doi:10.1086/605456, S2CID 17821279.
- ^ a b Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598 .
- ^ a b McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527 .
- ^ a b "32 Vul". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018年11月17日.
- ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878 , Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x , S2CID 14878976.