32 Vulpeculae

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]

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[1] mas
Distance610 ± 10 ly
(186 ± 4 pc)
Absolute magnitude (MV)−1.76[4]
Details
Radius54.29+1.69
−3.42[1] R☉
Luminosity708.4±19.5[1] L☉
Surface gravity (log g)1.74[6] cgs
Temperature4,041+134
−61[1] K
Metallicity [Fe/H]−0.16[6] dex
Rotational velocity (v sin i)8.1[4] km/s
Other designations
32 Vul, NSV 13398, BD+27° 3911, FK5 786, GC 29178, HD 199169, HIP 103200, HR 8008, SAO 89272[7]
Database references
SIMBADdata

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
  1. 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. 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.
  3. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S.
  4. 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.
  5. 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.
  6. 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.
  7. "32 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-11-17.
  8. 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.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.