HD 32188

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HD 32188
Auriga constellation map.svg
Red circle.svg
Location of HD 32188 (circled)
Observation data
Epoch J2000       Equinox J2000
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  mas [2]
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
NSV 1810, BD+41°1044, HD 32188, HIP 23511, HR 1615, SAO 39979 [10]
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

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 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 .
  4. 1 2 3 4 5 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. 1 2 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.
  6. ↑ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington DC: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  7. 1 2 3 4 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv: 2407.06963 . Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  8. 1 2 3 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. arXiv: 2008.06288 . Bibcode:2021ApJ...921....5B. doi: 10.3847/1538-4357/ac1a77 .
  9. 1 2 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.
  10. ↑ "HD 32188". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-12-18.
  11. ↑ 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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