Main Sequence Masses and Radii from Gravitational Redshifts

Details Main Sequence Masses and Radii from Gravitational Redshifts Main Sequence Masses and Radii from Gravitational Redshifts

1995-12-02

arxiv.org/abs/astro-ph/9512005v1

Astronomy and Astrophysics

Astrophysics

7 pages, latex, no figures, to be published in ApJ Letters

Scientific paper

10.1086/309911

Modern instrumentation makes it possible to measure the mass to radius ratio for main sequence stars in open clusters from gravitational redshifts. For stars where independent information is available for either the mass or the radius, this application of general relativity directly determines the other quantity. Applicable examples are: 1) measuring the radii of solar metallicity main sequence stars for which the mass - luminosity relation is well known, 2) measuring the radii for stars where model atmospheres can be used to determine the surface gravity (the mass to radius squared ratio), 3) refining the mass - radius relation for main sequence stars, and 4) measuring the change in radius as stars evolve off the main sequence and up the giant branch.

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