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  eps Aur  
000-BCT-905 (28906 observations)  
Auriga Sequence
05 01 58.13 +43 49 23.9  (75.49221 +43.82331) Search nearby
B1950.0 04 58 22.53 +43 45 05.4
Proper motion
RA: -0.86 +/- 1.38 mas/yDec: -2.66 +/- 0.75 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 162.788 +1.179
Other names

(Internal only)
7 Aur AAVSO 0454+43 ADS 3605 A
BD+43 1166 HD 31964 HIP 23416
HR 1605 IRC +40109 RAFGL 670S
SAO 39955    
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Variability type
Spectral type A8Ia-F2epIa+BV
Mag. range
2.92 - 3.83 V
Discoverer --
04 Jun 1956 (HJD 2435629) Ephemeris
Outburst --
Period 9892 d  (27.08 y)
Rise/eclipse dur. 8%
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1 GCVS Team VB A (B 14.0m, 21", 224deg). d = 0.037P. Survey of the physical properties of the system [O.Struve, PASP 68, 27, 1956., K.O.Wright, JRAS Can 49, 221, 1955., H.A.Abt, ApJ 126, 138, 1957., I.M.Kopylov, R.N.Kumajgorodskaya, Izv. Krymsk. Astrofiz. Obs. 29, 251, 1963., M.Hack, Mem SAIt 32, F.4, 1961==Milano-Merate Contr N185, 1962., Kh.Albo, Tartu Publ 45, 284, 1977.]. The spectrum probably varies even outside eclipses. The eclipses are probably due to a disk of gas and dust surrounding the hot companion. The brightness has physical fluctuations with the amplitude up to 0.24m and the cycle about 110d [C.M.Huffer, ApJ 76, 1, 1932.] which hinder revealing the possible Min II. Similar cycle was discovered also in the fluctuations of Vr.
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1 Kh.Albo, Tartu Publ. 39, 82, 1971. --
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Revision History
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2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.