Absolute radius of an M giant

Details Absolute radius of an M giant Absolute radius of an M giant

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260..156v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 156-160.

Astronomy and Astrophysics

Astrophysics

32

M Stars, Radii, Red Giant Stars, Stellar Magnitude, Iue, Symbiotic Stars

Scientific paper

We determine the absolute radius of an M2.4 III giant to be 75 solar radii, and we discuss and estimate the expected error. This value is found from the 1991 eclipse of the symbiotic binary EG And, observed in the UV. This system consists of a hot prewhite dwarf and an M giant. From two observed eclipses, separated by 6 orbital periods, we derive an ephemeris with a period of 482.2 d. The inclination of the system is sin i = 0.99 + 0.01. We also estimate the masses of the hot component and of the red giant, and we determine a bolometric distance of 400 pc for the EG And system. This is the first bolometric distance determination of a symbiotic system, and it therefore provides a check to the commonly used spectroscopic parallaxes of the red giants.

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