HD 34626

HD 34626, also known as MZ Aurigae, is an unusual variable star in the northern constellation of Auriga. It varies in brightness by 0.1 magnitude over time scales of 8 to 12 hours, but these variations are not periodic. This indicates the variability is not caused by ellipsoidal effects, and the nature of the variability remains unknown. It is a Be star and is rotating rapidly.[7]

HD 34626

A light curve for HD 34626 from KELT data, adapted from Labadie-Bartz et al. (2017)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 20m 33.03671s[2]
Declination +36° 37′ 56.0298″[2]
Apparent magnitude (V) 8.16[3]
Characteristics
Spectral type B1.5 IVnp[4]
U−B color index −0.68[5]
B−V color index +0.03[5]
Astrometry
Radial velocity (Rv)-6[6] km/s
Proper motion (μ) RA: +0.56[2] mas/yr
Dec.: -3.87[2] mas/yr
Parallax (π)2.07 ± 0.86 mas[2]
Distanceapprox. 1,600 ly
(approx. 500 pc)
Details
Mass7.30±0.48[3] M☉
Luminosity1,897[3] L☉
Temperature22,675[3] K
Rotational velocity (v sin i)310[7] km/s
Other designations
MZ Aurigae, MZ Aur, BD+36° 1090, HD 34626, HIP 24938, SAO 57915.
Database references
SIMBADdata

References
  1. Labadie-Bartz, Jonathan; Pepper, Joshua; McSwain, M. Virginia; Bjorkman, J. E.; Bjorkman, K. S.; Lund, Michael B.; Rodriguez, Joseph E.; Stassun, Keivan G.; Stevens, Daniel J.; James, David J.; Kuhn, Rudolf B.; Siverd, Robert J.; Beatty, Thomas G. (May 2017). "Photometric Variability of the Be Star Population". The Astronomical Journal. 153 (6). doi:10.3847/1538-3881/aa6396. Retrieved 30 October 2021.
  2. 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 18759600Vizier catalog entry
  3. Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349–360, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483
  4. Walborn, N. R. (1971). "Some Spectroscopic Characteristics of the OB Stars: An Investigation of the Space Distribution of Certain OB Stars and the Reference Frame of the Classification". The Astrophysical Journal Supplement Series. 23: 257. Bibcode:1971ApJS...23..257W. doi:10.1086/190239.
  5. Deutschman, W. A.; Davis, R. J.; Schild, R. E. (February 1976), "The galactic distribution of interstellar absorption as determined from the Celescope catalog of ultraviolet stellar observations and a new catalog of UBV, H-beta photoelectric observations", Astrophysical Journal Supplement Series, 30: 97–225, Bibcode:1976ApJS...30...97D, doi:10.1086/190359
  6. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  7. Percy, J. R. (December 1984), "Five suspected Beta Cephei stars revisited", Journal of the Royal Astronomical Society of Canada, 78: 241–250, Bibcode:1984JRASC..78..241P
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