Masses of AGB stars

Physics

Scientific paper

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Hst Proposal Id #9422

Scientific paper

There are few AGB stars with known masses. We have undertaken a program to measure spectroscopic orbits for about 50 binary systems containing M giants and typically white dwarfs. These are all single lined systems so the spectroscopic orbit of the M giant results in a mass function, m_2^3sin^3i / {m_1 + m_2}^2, for the secondary. Under special conditions, it is possible to undertake a simple observation that allows a solution for the masses. By measuring the angular separation at the epoch of greatest elongation of a zero eccentricity, eclipsing system {i.e. a system with a known inclination} m_1+m_2 can be determined, hence allowing the masses to be solved. Parallaxes indicate that there are two systems that can be resolved using HST/ACS. We propose to carry out this observation.

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