Astronomy:V420 Aurigae

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Short description: Star in the constellation Auriga
V420 Aurigae
V420AurLightCurve.png
A light curve for V420 Aurigae, plotted from Hipparcos data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Auriga
Right ascension  05h 22m 35.23140s[2]
Declination +37° 40′ 33.6386″[2]
Apparent magnitude (V) 7.35 - 7.51[3]
Characteristics
Spectral type B0IVpe[4]
U−B color index −0.88[5]
B−V color index +0.16[5]
Variable type HMXB[6] + γ Cas[3]
Astrometry
Radial velocity (Rv)−20.5±4.4[7] km/s
Proper motion (μ) RA: +1.305[2] mas/yr
Dec.: −3.999[2] mas/yr
Parallax (π)0.7214 ± 0.0196[2] mas
Distance4,500 ± 100 ly
(1,390 ± 40 pc)
Details
HD 34921 A
Mass17.5[8] M☉
Radius10.8[2] R☉
Luminosity1,673[9] L☉
Surface gravity (log g)3.5[4] cgs
Temperature30,000[4] K
Metallicity [Fe/H]−0.39[2] dex
Rotational velocity (v sin i)240±4[10] km/s
Other designations
V420 Aur, BD+37°1160, HD 34921, HIP 25114, SAO 57950[11]
Database references
SIMBADdata

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.[6]

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.[12] 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.[13] The system displays an infrared excess, suggesting it has an orbiting circumstellar envelope of gas and possibly dust.[4] 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.[12]

References

  1. ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 V420 Aurigae, AAVSO, https://www.aavso.org/vsx/index.php?view=detail.top&oid=4182, retrieved 2022-06-12 
  4. ↑ 4.0 4.1 4.2 4.3 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. 
  5. ↑ 5.0 5.1 "UBV and Hgamma observations of early-type field stars", Astronomical Journal 77: 376, June 1972, doi:10.1086/111296, Bibcode: 1972AJ.....77..376L. 
  6. ↑ 6.0 6.1 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, doi:10.1086/382246, Bibcode: 2004PASP..116..178P. 
  7. ↑ 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, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  8. ↑ Fortin, Francis; García, Federico; Chaty, Sylvain; Chassande-Mottin, Eric; Simaz Bunzel, Adolfo (2022), "Constraints to neutron-star kicks in high-mass X-ray binaries with Gaia EDR3", Astronomy and Astrophysics 665: A31, doi:10.1051/0004-6361/202140853, Bibcode: 2022A&A...665A..31F. 
  9. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  10. ↑ Halbedel, Elaine M. (September 1996), "Rotational Velocity Determinations for 164 Be and B Stars", Publications of the Astronomical Society of the Pacific 108: 833, doi:10.1086/133804, Bibcode: 1996PASP..108..833H. 
  11. ↑ "HD 34921". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+34921. 
  12. ↑ 12.0 12.1 Prišegen, M. (January 2019), "Concerning the occurrence of bow shocks around high-mass X-ray binaries", Astronomy & Astrophysics 621: 12, doi:10.1051/0004-6361/201832682, A37, Bibcode: 2019A&A...621A..37P. 
  13. ↑ 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. 

Further reading

  • Norci, L. et al. (December 2006), "Is the X-ray Transient HD 34921 (4U 0515+38) a B[e] Star?", Stars with the B[e] Phenomenon. ASP Conference Series, Vol. 355, Proceedings of the Conference Held 10-16 July, 2005, at the Isle of Vlieland, The Netherlands (San Francisco: Astronomical Society of the Pacific) 355: p. 289, Bibcode: 2006ASPC..355..289N. 
  • Polcaro, V. F. et al. (2007), St.-Louis, Nicole; Moffat, Anthony F.J., eds., "The Very Unusual HMXRB HD 34921", Massive Stars in Interactive Binaries, ASP Conference Series 367 (San Francisco: Astronomical Society of the Pacific) 367: p. 471, Bibcode: 2007ASPC..367..471P. 
  • Waagen, Elizabeth O. (October 2016), "Observations of V420 Aur (HD 34921) needed to support spectroscopy", AAVSO Alert Notice 554 554: p. 1, Bibcode: 2016AAN...554....1W. 
  • Polcaro, V. F. et al. (2006), Meurs, E. J. A.; Fabbiano, G., eds., "The Be/X-ray transient HD34921", Populations of High Energy Sources in Galaxies Proceedings of the 230th Symposium of the International Astronomical Union, Held in Dublin, Ireland 15-19 August 2005 (Cambridge: Cambridge University Press) 1: pp. 49–50, doi:10.1017/S1743921306007824, Bibcode: 2006IAUS..230...49P. 

External links

Coordinates: Sky map 05h 22m 35.2305s, +37° 40′ 33.629″



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