HD 34626

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 33.03590s[2]
Declination +36° 37′ 56.0306″[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]
Variable type SX Ari?[6]
Astrometry
Radial velocity (Rv)−6[7] km/s
Proper motion (μ) RA: −0.630[2] mas/yr
Dec.: −4.017[2] mas/yr
Parallax (π)0.9831 ± 0.0356 mas[2]
Distance3,300 ± 100 ly
(1,020 ± 40 pc)
Details
Mass4.4[2] M☉
Radius21[2] R☉
Luminosity556[2] L☉
Temperature22,675[3] K
Rotational velocity (v sin i)310[8] km/s
Age200[9] Myr
Other designations
MZ Aurigae, MZ Aur, BD+36°1090, HD 34626, HIP 24938, SAO 57915.
Database references
SIMBADdata

HD 34626, also known as MZ Aurigae, is an unusual variable star in the northern constellation of Auriga. It has an apparent magnitude of 8.2 and is about 3,300 light years away.

The spectrum of HD 34626 had long been known to be unusual, with very broad lines indicating rapid rotation and emission lines marking it as a Be star. In 1970, it was found to vary in brightness by 0.1 magnitude over time scales of 8 to 12 hours, but these variations are not periodic.[10] This indicates the variability is not caused by ellipsoidal effects, and the nature of the variability remains unknown.[8] It may be a type of SX Arietis variable.[6]

HD 34626 has exhausted its core hydrogen and evolved away from the main sequence. Its spectral type indicates that it is a subgiant, but evolutionary models suggest it may be in the giant stage.[2]

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  3. ^ a b Cite error: The named reference an331_4_349 was invoked but never defined (see the help page).
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  5. ^ a b Cite error: The named reference ajss30_97 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference vsx was invoked but never defined (see the help page).
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  8. ^ a b Cite error: The named reference jrasc78_241 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference tetzlaff2011 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference percy1970 was invoked but never defined (see the help page).