2013A&A...559A..22M


Query : 2013A&A...559A..22M

2013A&A...559A..22M - Astronomy and Astrophysics, volume 559A, 22-22 (2013/11-1)

The O-type eclipsing contact binary LY Aurigae - member of a quadruple system.

MAYER P., DRECHSEL H., HARMANEC P., YANG S. and SLECHTA M.

Abstract (from CDS):

The eclipsing binary LY Aur (O9II + O9III) belongs to the rare class of early-type contact systems. We obtained 23 new spectra at the Ondrejov and Dominion Astrophysical Observatories, which were analysed with four older Calar Alto and one ELODIE archive spectra. A new result of this study is that the visual companion of LY Aur - the spectral lines of which are clearly seen in our spectra - is also an SB1 binary having an orbital period of 20.46d, an eccentric orbit, and a radial velocity semi-amplitude of 33km/s. The Hα line blend contains an emission component, which shows dependence on the orbital phase of the eclipsing system, with the strongest emission around the secondary eclipse. Revised elements of the eclipsing binary and the orbital solution of the companion binary are determined from our set of spectra and new light-curve solutions of the eclipsing pair. The mass of the primary of 25.5M agrees well with its spectral type, whereas the secondary mass of 14M is smaller than expected. From an O-C analysis of the minimum times of LY Aur that span more than 40 years, we found that the orbital period is decreasing, indicating the presence of interaction processes. The system is likely in a phase of non-conservative mass exchange.

Abstract Copyright:

Journal keyword(s): stars: early-type - binaries: eclipsing - binaries: visual - stars: individual: LY Aurigae

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 CD-22 16556 * 00 02 43.5993438744 -21 36 09.367378776   12.48 12.83     F0 6 0
2 V* SZ Cam EB* 04 07 49.2849421032 +62 19 58.626896088 6.82 7.26 6.93     O9.5Vn 216 1
3 Ass Aur OB 1 As* 05 22 +33.9           ~ 81 0
4 V* IU Aur SB* 05 27 52.3995663216 +34 46 58.262388600 7.91 8.57 8.39     O9.5IV(n) 178 0
5 Ass Aur OB 2 As* 05 28 +34.9           ~ 45 0
6 HD 35921B * 05 29 42.628 +35 22 29.89   8.56 8.35     B0.2IV 6 0
7 HD 35921 EB* 05 29 42.65002 +35 22 30.0896 6.23 6.96 6.85     O9II 238 0
8 * del Ori SB* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 O9.5IINwk 760 0
9 HD 93206 EB* 10 44 22.9085235888 -59 59 35.970489960 5.53 6.37 6.24 7.42   O9.7Ibn 207 0
10 V* TU Mus EB* 11 31 10.9241479224 -65 44 32.099167788 7.58 9.52 9.34 9.25   O8V(n)z+B0V(n) 164 0
11 HD 152248 EB* 16 54 10.0618206816 -41 49 30.139291596 5.56 6.15 6.088     O7Iabf+O7Ib(f) 246 0

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2023.01.30-21:47:26

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