XXXIX. Light curves of the pre–main sequence triple system TY Coronae Australis
Departamento de Física, ICEx, Universidade Federal de Minas Gerais, C.P. 702, 30.123–970 – Belo Horizonte, MG, Brazil
2 Department of Astronomy, University of Wisconsin, Madison, Wisconsin 53706, U.S.A.
3 Niels Bohr Institute for Astronomy, Physics and Geophysics; Astronomical Observatory, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
4 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, U.S.A.
Send offprint request to: L.P.R. Vaz at address 1
Accepted: 28 November 1997
Complete uvby light curves of the detached Herbig Be eclipsing binary TY Coronae Australis are presented. A total of 1789 photometric measurements in each of the four colours were obtained in 1989 and in 1992-1994. A detailed analysis of the y light curve obtained in 1992-1993 is published separately (Casey et al. 1997). The reflection nebula around the system contributes about 30% of the light in all four passbands. Here we present and discuss the non-eclipse-related photometric variability of the system. We suggest that these variations are the result of variable obscuration, possibly linked to dust shells physically associated to the system.
Key words: binaries: eclipsing: / stars: individual: TY CrA / stars: pre-main sequence
Based on observations collected with the Danish 50 cm Strömgren Automatic Telescope, SAT, at the European Southern Observatory (ESO), La Silla, Chile.
Tables 2a–2d will only be available in electronic form at the CDS via anonymous ftp 126.96.36.199 or http://cdsweb.u-strasbg.fr/Abstract.html
© European Southern Observatory (ESO), 1998