Limitations on the masses and other dimensions of the binary HD 77581

Astronomy and Astrophysics – Astronomy

Scientific paper

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Eclipsing Binary Stars, Neutron Stars, Size Determination, Stellar Mass, X Ray Sources, X Ray Stars, Astronomical Photometry, Astronomical Spectroscopy, Black Holes (Astronomy), Dimensional Measurement, Gravitation Theory, Radii, Stellar Evolution, Stellar Luminosity

Scientific paper

The mass of the X-ray source 2U 0900-40 is found to be about 2 solar masses. This object could, therefore, play an important role in the determination of the maximum mass of neutron stars and thereby test strong field predictions of gravitational theories. It is shown that the X-ray eclipse angle can be used to derive a lower limit for the mass ratio of the primary to the secondary. All reported eccentric elements for HD 77581 are found to conflict with the width of the observed eclipse. The mass and radius of the primary are found to be 20 to 25 solar masses and about 30 solar radii.

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