Semi-Detached Binaries as Probes of the Local Group

Details Semi-Detached Binaries as Probes of the Local Group Semi-Detached Binaries as Probes of the Local Group

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..456w&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

Reasons to be interested in semi-detached (SD) eclipsing binaries (EB's) for distances and chemical compositions of Local Group galaxies are outlined. Advantages over detached binaries for distances include (1) EB parameter information is mainly in eclipses with relatively large fractions of SD data being in eclipse phases (2) eccentricity is known and argument of periastron is irrelevant because circular orbits are virtually guaranteed for SD's and (3) light curves provide mass ratio in favorable SD cases so single-lined velocities can give the absolute scale. Disadvantages include (1) temperature at a surface reference location is more difficult to estimate than for detached binaries (2) velocity curves for SD primaries typically have small amplitude and velocities for the dim secondaries are hard to obtain. Lesser advantages and disadvantages and other items whose status depends on circumstances will be covered and some comments on overcontact binaries will be made. A galaxy's composition should influence the evolution of its SD binaries because onset of mass transfer is a triggered process with the trigger sensitive to composition. Indeed the statistics of SD's in the Small Magellanic Cloud appear to differ from those of the Milky Way.

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