Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-17
Astronomy and Astrophysics
Astrophysics
Invited contribution, to appear in "Fate of the Most Massive Stars", R. M. Humphreys and K. Z. Stanek, eds, ASP Conference Ser
Scientific paper
Accurate masses and, in general, all fundamental parameters of distant stars can only be measured in eclipsing binaries. Several massive star candidates with masses near 200 Mo exist, however they have large uncertainties associated with them. The most massive binary ever measured accurately is WR 20a, for which we present the light curve. Measuring the period and inclination, we derive masses greater than 80 Mo for each component. Massive binaries are bound to exist in Local Group galaxies, such as M31 and M33. These can be selected from their light curves, obtained by variability studies, such as the DIRECT project. We present photometry and spectroscopy of the detached system M33A, for which we are obtaining a direct distance determination. The DIRECT project has detected several candidate massive binaries which are brighter but non-detached systems, perhaps similar to WR 20a. We plan to obtain spectra for them and measure their masses.
Bonanos Alceste Zoe
Stanek Krzysztof Z.
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