Astronomy:HD 32188
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 05h 03m 18.63s[2] |
| Declination | +41° 26′ 29.9355″[2] |
| Apparent magnitude (V) | 6.08[3] |
| Characteristics | |
| Spectral type | A2IIIshe[4] |
| U−B color index | +0.22[3] |
| B−V color index | +0.21[3] |
| Variable type | Suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | −0.7[6] km/s |
| Proper motion (μ) | RA: −0.227[2] mas/yr Dec.: −1.820[2] mas/yr |
| Parallax (π) | 1.0065 ± 0.0294[2] mas |
| Distance | 3,240 ± 90 ly (990 ± 30 pc) |
| Absolute magnitude (MV) | −2.87[4] |
| Details | |
| Mass | 3.1[7] M☉ |
| Radius | 40[2] R☉ |
| Luminosity | 5,370[8] L☉ |
| Surface gravity (log g) | [7] cgs |
| Temperature | 8,665[7] K |
| Rotation | 0.41 days[8] |
| Rotational velocity (v sin i) | 23[9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 32188 is suspected variable star[5] 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.[3] The distance to this star is approximately 3,240 light years, based on parallax.[2] It has an absolute magnitude of −2.87.[4]
This object is an A-type giant star with a stellar classification of A2IIIshe.[4] The suffix notation indicates this is a shell star,[11] 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.[4] HD 32188 has expanded to 40 times the radius of the Sun[2] and it is spinning with a projected rotational velocity of 23 km/s.[9] It is radiating 5,370 times the luminosity of the Sun[8] from its enlarged photosphere at an effective temperature of 8,665 K.[7]
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 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, doi:10.1086/131362, Bibcode: 1984PASP...96..441G.
- ↑ 4.0 4.1 4.2 4.3 4.4 Hauck, B.; Jaschek, C. (February 2000), "A-shell stars in the Geneva system", Astronomy and Astrophysics 354: 157–162, Bibcode: 2000A&A...354..157H.
- ↑ 5.0 5.1 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington DC: Carnegie Institution of Washington, Bibcode: 1953GCRV..C......0W.
- ↑ 7.0 7.1 7.2 7.3 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K.
- ↑ 8.0 8.1 8.2 Balona, Luis A.; Ozuyar, Dogus (2021). "TESS Observations of be Stars: General Characteristics and the Impulsive Magnetic Rotator Model". The Astrophysical Journal 921 (1): 5. doi:10.3847/1538-4357/ac1a77. Bibcode: 2021ApJ...921....5B.
- ↑ 9.0 9.1 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, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R.
- ↑ "HD 32188". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+32188.
- ↑ 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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