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


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:26:04

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

goto Full paper

goto View the reference in ADS

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 - 2020
#notes
1 CD-22 16556 * 00 02 43.5993817744 -21 36 09.370371336   12.48 12.83     F0 5 0
2 V* SZ Cam bL* 04 07 49.2860550827 +62 19 58.627126529 6.82 7.26 6.93     O9.5Vn 205 1
3 Ass Aur OB 1 As* 05 22 +33.9           ~ 75 0
4 V* IU Aur bL* 05 27 52.4053853877 +34 46 58.343520392 7.91 8.57 8.39     B3Vnne 168 0
5 Ass Aur OB 2 As* 05 28 +34.9           ~ 42 0
6 HD 35921B * 05 29 42.628 +35 22 29.89   8.56 8.35     O9.5 5 0
7 HD 35921 bL* 05 29 42.65002 +35 22 30.0896 6.23 6.96 6.85     O9II 228 0
8 * del Ori Al* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 B0III+O9V 742 0
9 HD 93206 bL* 10 44 22.9117286732 -59 59 35.978252992 5.53 6.37 6.24 7.42   O9.7Ibn 192 0
10 V* TU Mus bL* 11 31 10.9242217305 -65 44 32.098796901 7.58 9.52 9.34 9.25   O8V(n)z+B0V(n) 150 0
11 HD 152248 bL* 16 54 10.0614779606 -41 49 30.143138696 5.56 6.15 6.088     O7Iabf+O7Ib(f) 228 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2013A&A...559A..22M and select 'bookmark this link' or equivalent in the popup menu


2020.07.04-14:26:04

© Université de Strasbourg/CNRS

    • Contact