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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.[5]

V420 Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 22m 35.23122s[1]
Declination +37° 40′ 33.6403″[1]
Apparent magnitude (V) 7.35 - 7.51[2]
Characteristics
Spectral type B0IVpe[3]
U−B color index −0.88[4]
B−V color index +0.16[4]
Variable type High-mass X-ray binary[5] + γ Cas[2]
Astrometry
Radial velocity (Rv)−20.5±4.4[6] km/s
Proper motion (μ) RA: +1.294 mas/yr[1]
Dec.: −4.024 mas/yr[1]
Parallax (π)0.7534 ± 0.0574 mas[1]
Distance4,300 ± 300 ly
(1,300 ± 100 pc)
Details
HD 34921 A
Rotational velocity (v sin i)240±4[7] km/s
Other designations
V420 Aur, BD+37°1160, HD 34921, HIP 25114, SAO 57950[8]
Database references
SIMBADdata

These coordinates were identified as an X-ray source using the Uhuru satellite in 1978, then associated with the star V420 Aurigae by V. F. Polcaro and associates in 1984.[9] The spectrum of the star shows rapid variation in the lines of singly-ionized iron and Balmer line emission, with these varying on a time scale of less than 300 seconds. This lends support to the presence of a compact companion.[10] The system displays an infrared excess, suggesting it has an orbiting circumstellar envelope of gas and possibly dust.[11] The system appears to be positioned at the center of an irregular, wispy nebula that was detected in the infrared band. One of the two filaments in this nebula appears to be connected with the system.[9]


References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. V420 Aurigae, AAVSO, retrieved 2022-06-12
  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. 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.
  5. 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.
  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. Halbedel, Elaine M. (September 1996), "Rotational Velocity Determinations for 164 Be and B Stars", Publications of the Astronomical Society of the Pacific, 108: 833, Bibcode:1996PASP..108..833H, doi:10.1086/133804.
  8. "HD 34921". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-10.
  9. Prišegen, M. (January 2019), "Concerning the occurrence of bow shocks around high-mass X-ray binaries", Astronomy & Astrophysics, 621: 12, arXiv:1811.06781, Bibcode:2019A&A...621A..37P, doi:10.1051/0004-6361/201832682, A37.
  10. Rossi, C.; et al. (September 1991), "Rapid variability of BD +37 1160, a possible optical counterpart of the X-ray source 1H 0521+373.", Astronomy and Astrophysics, 249: L19, Bibcode:1991A&A...249L..19R.
  11. Polcaro, V. F.; et al. (May 1990), "BD +37 1160 : a probable optical counterpart of the X-ray source 1H 0521+373", Astronomy and Astrophysics, 231: 354–364, Bibcode:1990A&A...231..354P.

Further reading





На других языках

- [en] V420 Aurigae

[ru] V420 Возничего

V420 Возничего (лат. V420 Aurigae), HD 34921 — тройная звезда в созвездии Возничего на расстоянии приблизительно 4329 световых лет (около 1327 парсеков) от Солнца. Видимая звёздная величина звезды — от +7,53m до +7,42m[9].


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