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V420 Aurigae - Wikipedia

Coordinates:

05^h 22^m 35.2305^s, +37° 40′ 33.629″

From Wikipedia, the free encyclopedia

V420 Aurigae
Observation data Epoch J2000 Equinox J2000
A light curve for V420 Aurigae, plotted from Hipparcos data^[1]
Constellation	Auriga
Right ascension	05^h 22^m 35.23140^s^[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 (R_v)	−20.5±4.4^[7] km/s
Proper motion (μ)	RA: +1.305 mas/yr^[2] Dec.: −3.999 mas/yr^[2]
Parallax (π)	0.7214 ± 0.0196 mas^[2]
Distance	4,500 ± 100 ly (1,390 ± 40 pc)

Details
HD 34921 A
Mass	17.5^[8] `M`_☉
Radius	10.8^[2] `R`_☉
Luminosity	1,673^[9] `L`_☉
Surface gravity (log g)	3.5^[4] cgs
Temperature	30,000^[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 1H 0521+373^[11]
Database references
SIMBAD	data

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 BD+37°1160 by Vito Francesco Polcaro and associates in 1990.^[12] The star was found to be a variable star in the visible part of the spectrum, from the Hipparcos data, and was given the variable star designation V420 Aurigae, in 1999.^[13]

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.^[14] 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.^[15]

References

^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
^ ^a ^b ^c ^d ^e ^f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b V420 Aurigae, AAVSO, retrieved 2022-06-12
^ ^a ^b ^c ^d 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.
^ ^a ^b 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.
^ ^a ^b 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, S2CID 120898311.
^ 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.
^ 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, arXiv:2206.03904, Bibcode:2022A&A...665A..31F, doi:10.1051/0004-6361/202140853, S2CID 249461983.
^ 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.
^ 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, S2CID 119944672.
^ "HD 34921". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-10.
^ Polcaro, V. F.; Rossi, C.; Giovannelli, F.; Ferrari-Toniolo, M.; La Padula, C.; Persi, P.; Manchanda, R. K.; Golinskaya, I. M.; Kurt, V. G.; Misykima, T. A.; Shafer, E. Yu.; Shamolin, V. M.; Smirnov, A. S.; Sheffer, E. K.; Boyarchuck, A. A.; Gershberg, R. (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. Retrieved 2 December 2024.
^ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659: 1–27. Bibcode:1999IBVS.4659....1K. Retrieved 2 December 2024.
^ 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.
^ 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, S2CID 119443071, A37.

External links

Constellation of Auriga

Stars

Bayer	α (Capella) β (Menkalinan) γ (Elnath) δ ε (Almaaz) ζ (Saclateni) η (Haedus) θ (Mahasim) ι (Hassaleh) κ λ (Alhurr) μ ν ξ ο π ρ σ τ υ φ χ ψ¹ ψ² ψ³ ψ⁴ ψ⁵ ψ⁶ ψ⁷ ψ⁸ ψ⁹ ω
Flamsteed	2 5 6 9 12 14 16 18 19 22 26 28 36 38 39 40 41 42 43 45 47 49 51 53 54 59 60 62 63 64 65 66 35 Cam
Variable	R T RT (48) RW SU UU WW AB AE AR (17) EO IQ IU LY MZ NO NY PU QZ V352 V361 V394 V420 V433 V538
HR	1558 1615 1738 1752 1794 1795 1822 1825 1866 1884 1938 1945 2028 2096 2137
HD	33203 33463 35619 43691 45350 (Lucilinburhuc) 49674 (Nervia)
Other	Gliese 268 HAT-P-9 (Tevel) KELT-2 MWC 480 SGR 0501+4516 UGPS J0521+3640 WASP-12

Exoplanets	HAT-P-9b (Alef) HD 40979 b HD 43691 b HD 45350 b HD 49674 b KELT-2Ab WASP-12b

Star
clusters

NGC	1664 1893 1907 1931 2240 2281
Other	Messier 36 Messier 37 Messier 38 Palomar 2

Nebulae

NGC	1985 2242
Other	IC 405 IC 2149 Westbrook Nebula

Galaxies	3C 147 4C +41.17 DA 193 MCG +08-11-011

Galaxy clusters	MACS J0717.5+3745

References

Further reading

External links