HD 32188

HD 32188 is suspected variable star[4] in the northern constellation of Auriga, and is positioned roughly in between Eta and Zeta Aurigae. It has a white hue and is just barely visible to the naked eye with an apparent visual magnitude that fluctuates around 6.08.[2] The distance to this star is approximately 3,000 light years, based on parallax.[1] It has an absolute magnitude of −2.87.[3]

HD 32188
Location of HD 32188 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 03m 18.63675s[1]
Declination +41° 26′ 29.9355″[1]
Apparent magnitude (V) 6.08[2]
Characteristics
Spectral type A2IIIshe[3]
U−B color index +0.22[2]
B−V color index +0.21[2]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)−0.7[5] km/s
Proper motion (μ) RA: −0.44[6] mas/yr
Dec.: −1.89[6] mas/yr
Parallax (π)1.0886 ± 0.0733 mas[1]
Distance3,000 ± 200 ly
(920 ± 60 pc)
Absolute magnitude (MV)−2.87[3]
Details
Radius30.39+1.63
−0.99[1] R☉
Luminosity2,428±207[1] L☉
Temperature7,350+123
−189[1] K
Rotational velocity (v sin i)23[7] km/s
Other designations
NSV 1810, BD+41°1044, HD 32188, HIP 23511, HR 1615, SAO 39979[8]
Database references
SIMBADdata

This object is an A-type giant star with a stellar classification of A2IIIshe.[3] The suffix notation indicates this is a shell star,[9] which means it has a peculiar spectrum indicating there is a circumstellar disk of gas around the star's equator. While the spectral luminosity class is III, analysis of its colour and brightness suggest it more closely resembles a supergiant star.[3] HD 32188 has expanded to 30[1] times the radius of the Sun and it is spinning with a projected rotational velocity of 23 km/s.[7] It is radiating 2,428[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 7,350 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. Guetter, H. H.; Hewitt, A. V. (June 1984), "Photoelectric UBV photometry for 317 PZT and VZT stars", Publications of the Astronomical Society of the Pacific, 96: 441–443, Bibcode:1984PASP...96..441G, doi:10.1086/131362.
  3. Hauck, B.; Jaschek, C. (February 2000), "A-shell stars in the Geneva system", Astronomy and Astrophysics, 354: 157–162, Bibcode:2000A&A...354..157H.
  4. 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.
  5. Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington DC: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  6. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.Vizier catalog entry
  7. Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.
  8. "HD 32188". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-18.
  9. Jaschek, M.; et al. (March 1988), "A survey of AE and A-type shell stars in the photographic region.", Astronomy and Astrophysics Supplement Series, 72: 505–513, Bibcode:1988A&AS...72..505J.
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