Location of HD 32188 (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05 03 18.63675 |
| Declination | +41° 26′ 29.9355″ |
| Apparent magnitude (V) | 6.08 |
| Characteristics | |
| Spectral type | A2IIIshe |
| U−B color index | +0.22 |
| B−V color index | +0.21 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | −0.7 km/s |
| Proper motion (μ) | RA: −0.44 mas/yr Dec.: −1.89 mas/yr |
| Parallax (π) | 1.0886 ± 0.0733 mas |
| Distance | 3,000 ± 200 ly (920 ± 60 pc) |
| Absolute magnitude (MV) | −2.87 |
| Details | |
| Radius | 30.39+1.63 −0.99 R☉ |
| Luminosity | 2,428±207 L☉ |
| Temperature | 7,350+123 −189 K |
| Rotational velocity (v sin i) | 23 km/s |
| Other designations | |
| NSV 1810, BD+41°1044, HD 32188, HIP 23511, HR 1615, SAO 39979 | |
| Database references | |
| SIMBAD | data |
HD 32188 is suspected variable star 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. The distance to this star is approximately 3,000 light years, based on parallax. It has an absolute magnitude of −2.87.
This object is an A-type giant star with a stellar classification of A2IIIshe. The suffix notation indicates this is a shell star, 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. HD 32188 has expanded to 30 times the radius of the Sun and it is spinning with a projected rotational velocity of 23 km/s. It is radiating 2,428 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 7,350 K.
References
- ^ 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.
- ^ 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.
- ^ Hauck, B.; Jaschek, C. (February 2000), "A-shell stars in the Geneva system", Astronomy and Astrophysics, 354: 157–162, Bibcode:2000A&A...354..157H.
- ^ 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.
- Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington DC: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- ^ 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
- ^ 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.
- "HD 32188". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-18.
- 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.
External links
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