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AR Aurigae
	; A visual band light curve for AR Aurigae, adapted from Johansen (1970)
Observation data; Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05h 18m 18.896s
Declination	+33° 46′ 02.52″
Apparent magnitude (V)	6.144
Characteristics
Spectral type	B9V + B9.5V
U−B color index	−0.18
B−V color index	−0.06
Variable type	Algol
Astrometry
Radial velocity (Rv)	25.4±0.9 km/s
Proper motion (μ)	RA: +15.254 mas/yr ; Dec.: −29.225 mas/yr
Parallax (π)	7.0735 ± 0.0461 mas
Distance	461 ± 3 ly ; (141.4 ± 0.9 pc)
Absolute magnitude (MV)	1.11/1.17
Details
AR Aur A
Mass	2.552±0.008 M☉
Radius	1.781 R☉
Luminosity	41 L☉
Surface gravity (log g)	4.33 cgs
Temperature	10,950±150 K
Rotational velocity (v sin i)	10 km/s
AR Aur B
Mass	2.367±0.008 M☉
Radius	1.816 R☉
Luminosity	34 L☉
Surface gravity (log g)	4.28 cgs
Temperature	10,350±150 K
Rotational velocity (v sin i)	11 km/s
Other designations
	17 Aur, BD+33°1002, HD 34364, HIP 24740, HR 1728, SAO 57858, PPM 70158
Database references
SIMBAD	data

AR Aurigae (AR Aur), also known by its Flamsteed designation 17 Aurigae, is a binary star in the constellation Auriga. Based on parallax measurements made by the Hipparcos spacecraft, it is approximately 461 light-years from Earth.^[10]

Both components are blue-white B-type main-sequence stars that do not fill their Roche lobes. The system has a mean apparent magnitude of +6.15. However, the orbit of the stars are oriented in such a way that they periodically eclipse each other, so AR Aurigae is a variable star and its brightness varies from magnitude +6.15 to +6.82 with a period of 4.13 days.^[6] In 1931, H. N. Pendersen and J. C. Steensgard became the first persons to detect these eclipses.^[11]^[12] When an eclipse is not occurring, the star will be faintly visible to the naked eye under very good observing conditions.

The primary component of AR Aurigae is known to be a mercury-manganese star, also known as an HgMn star. As the name implies, these stars have over-abundances of the elements mercury and manganese, and also often xenon and other elements.^[4] Because AR Aurigae is an eclipsing binary (in fact, it is the only known eclipsing binary with a mercury-manganese star), accurate characterization of its parameters has been made possible. Based on the light-time effect observed from the stars, it is inferred that there is a third star with a mass of 0.54 M_☉, orbiting at a separation of 13 AU every 23.7 years.^[4]

References

^ Johansen, K. T. (January 1970). "Light curve and photometric elements of AR Aurigae". Astronomy & Astrophysics. 4: 1–10. Bibcode:1970A&A.....4....1J.
^ ^a ^b ^c ^d ^e 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.
^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Folsom, C. P.; Kochukhov, O.; Wade, G. A.; Silvester, J.; Bagnulo, S. (2010). "Magnetic field, chemical composition and line profile variability of the peculiar eclipsing binary star AR Aur★". Monthly Notices of the Royal Astronomical Society. 407 (4): 2383. arXiv:1005.3793. Bibcode:2010MNRAS.407.2383F. doi:10.1111/j.1365-2966.2010.17057.x. S2CID 13801978.
^ ^a ^b Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series. 34: 1–49. Bibcode:1978A&AS...34....1N.
^ ^a ^b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
^ ^a ^b ^c Nordstrom, B.; Johansen, K. T. (1994). "Radii and masses for the young star AR Aurigae". Astronomy and Astrophysics. 282: 787. Bibcode:1994A&A...282..787N.
^ ^a ^b ^c ^d Eker, Z.; Bilir, S.; Soydugan, F.; Gökçe, E. Yaz; Soydugan, E.; Tüysüz, M.; Şenyüz, T.; Demircan, O. (2014). "The Catalogue of Stellar Parameters from the Detached Double-Lined Eclipsing Binaries in the Milky Way". Publications of the Astronomical Society of Australia. 31. arXiv:1403.1583. Bibcode:2014PASA...31...24E. doi:10.1017/pasa.2014.17. S2CID 119238300.
^ van Leeuwen, F. (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. S2CID 18759600. Vizier catalog entry
^ Pedersen, H. N.; Steensgaard, J. C. (1931). "Title Not Known". Beobachtungs-Zirkular. 13: 70.
^ Nassau, J. J. (July 1936). "Light elements and orbit of AR Aurigae". Astronomical Journal. 45 (1051): 137–140. Bibcode:1936AJ.....45..137N. doi:10.1086/105358. Retrieved 29 November 2024.