EO Aurigae

EO Aurigae
	; The visual band light curve of EO Aurigae, adapted from Hartigan (1981)
Observation data; Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05h 18m 21.06592s
Declination	+36° 37′ 55.3517″
Apparent magnitude (V)	7.71
Characteristics
Spectral type	B3V + B3V
U−B color index	−0.63
B−V color index	0.08
Variable type	Algol variable
Astrometry
Radial velocity (Rv)	-1.1 km/s
Proper motion (μ)	RA: −1.67±1.71 mas/yr ; Dec.: −3.33±0.75 mas/yr
Parallax (π)	2.12 ± 1.15 mas
Distance	approx. 1,500 ly ; (approx. 500 pc)
Details
EO Aur A
Mass	6.22±0.73 M☉
Luminosity (bolometric)	2,784 L☉
Temperature	13,360 K
Age	23.6±8.0 Myr
EO Aur B
Mass	5.00±2.57 M☉
Luminosity (bolometric)	1377 L☉
Temperature	11,650 K
Other designations
	BD+36° 1073, HD 34333, HIP 24744, SAO 57857.
Database references
SIMBAD	data

EO Aurigae is an eclipsing binary of Algol type in the northern constellation of Auriga. With a combined apparent magnitude of 7.71,^[3] it is too faint to be seen with the unaided eye.

The eclipsing binary nature of the star was detected in 1943 by Sergei Gaposchkin at Harvard College Observatory.^[7] It consists of a pair of B-type main sequence stars orbiting each other with a period of 4.0656 days. During the eclipse of the primary star, the combined magnitude drops by 0.57; the eclipse of the secondary component drops the magnitude by 0.33.^[8]

References

^ Hartigan, P (January 1981). "A photoelectric lightcurve and elements of the eclipsing binary EO Aurigae". Journal of the AAVSO. 10: 13–20. Bibcode:1981JAVSO..10...13H. Retrieved 29 October 2021.
^ ^a ^b ^c ^d ^e 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
^ ^a ^b ^c ^d 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 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W
^ ^a ^b ^c ^d ^e ^f Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483
^ Gaposchkin, Sergei (1943). "A New Bright Eclipsing Variable of Large Mass, HV 10327". Publications of the Astronomical Society of the Pacific. 55 (325): 192–194. Bibcode:1943PASP...55..192G. doi:10.1086/125543.
^ Malkov, O. Yu.; et al. (February 2006), "A catalogue of eclipsing variables", Astronomy and Astrophysics, 446 (2): 785–789, Bibcode:2006A&A...446..785M, doi:10.1051/0004-6361:20053137, hdl:10995/73280

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[Hartigan-1] Hartigan, P (January 1981). "A photoelectric lightcurve and elements of the eclipsing binary EO Aurigae". Journal of the AAVSO. 10: 13–20. Bibcode:1981JAVSO..10...13H. Retrieved 29 October 2021.

[van_Leeuwen2007-2] 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

[aass34_1-3] 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

[tetzlaff-4] Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.

[gcsrv-5] Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W

[an331_4_349-6] ^ ^a ^b ^c ^d ^e ^f Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483

[Gaposchkin1943-7] Gaposchkin, Sergei (1943). "A New Bright Eclipsing Variable of Large Mass, HV 10327". Publications of the Astronomical Society of the Pacific. 55 (325): 192–194. Bibcode:1943PASP...55..192G. doi:10.1086/125543.

[aaa446_2_785-8] Malkov, O. Yu.; et al. (February 2006), "A catalogue of eclipsing variables", Astronomy and Astrophysics, 446 (2): 785–789, Bibcode:2006A&A...446..785M, doi:10.1051/0004-6361:20053137, hdl:10995/73280

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Observation data Epoch J2000 Equinox J2000
The visual band light curve of EO Aurigae, adapted from Hartigan (1981)^[1]
Constellation	Auriga
Right ascension	05^h 18^m 21.06592^s^[2]
Declination	+36° 37′ 55.3517″^[2]
Apparent magnitude (V)	7.71^[3]
Characteristics
Spectral type	B3V + B3V^[4]
U−B color index	−0.63^[3]
B−V color index	0.08^[3]
Variable type	Algol variable
Astrometry

Radial velocity (R_v)	-1.1^[5] km/s
Proper motion (μ)	RA: −1.67±1.71^[2] mas/yr Dec.: −3.33±0.75^[2] mas/yr
Parallax (π)	2.12 ± 1.15 mas^[2]
Distance	approx. 1,500 ly (approx. 500 pc)

Details
EO Aur A
Mass	6.22±0.73^[6] `M`_☉
Luminosity (bolometric)	2,784^[6] `L`_☉
Temperature	13,360^[6] K
Age	23.6±8.0^[4] Myr
EO Aur B
Mass	5.00±2.57^[6] `M`_☉
Luminosity (bolometric)	1377^[6] `L`_☉
Temperature	11,650^[6] K
Other designations
BD+36° 1073, HD 34333, HIP 24744, SAO 57857.
Database references
SIMBAD	data