V420 Aurigae

V420 Aurigae is a high-mass star with an inferred compact companion. Closely orbiting each other every 0.8 days, they are a source of X-ray emission.[4]

V420 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  05h 22m 35.23145s[1]
Declination +37° 40′ 33.629″[1]
Apparent magnitude (V) 7.49[2]
Characteristics
Spectral type B0IVpe[3]
U−B color index −0.88[2]
B−V color index +0.16[2]
Variable type High-mass X-ray binary[4]
Astrometry
Radial velocity (Rv)−20.5±4.4[5] km/s
Proper motion (μ) RA: +1.25[1] mas/yr
Dec.: -4.38[1] mas/yr
Parallax (π)−0.04 ± 0.72[1] mas
Other designations
BD+37° 1160, HD 34921, HIP 25114, SAO 57950.
Database references
SIMBADdata

References
  1. van Leeuwen, F. (November 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.
  2. Lutz, J. H.; Lutz, T. E. (June 1972), "UBV and Hgamma observations of early-type field stars", Astronomical Journal, 77: 376, Bibcode:1972AJ.....77..376L, doi:10.1086/111296.
  3. Hiltner, W. A. (October 1956), "Photometric, Polarization, and Spectrographic Observations of O and B Stars.", Astrophysical Journal Supplement, 2: 389, Bibcode:1956ApJS....2..389H, doi:10.1086/190029.
  4. Percy, John R.; et al. (February 2004), "Short-Period Variable Be Stars Discovered or Confirmed through Self-Correlation Analysis of Hipparcos Epoch Photometry", The Publications of the Astronomical Society of the Pacific, 116 (816): 178–183, Bibcode:2004PASP..116..178P, doi:10.1086/382246.
  5. 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.

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