A measurement of the primordial helium abundance using MU Cassiopeiae

Details A measurement of the primordial helium abundance using MU Cassiopeiae A measurement of the primordial helium abundance using MU Cassiopeiae

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..172h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 172-178.

Astronomy and Astrophysics

Astrophysics

8

Binary Stars, Helium, Speckle Interferometry, Stellar Composition, Abundance, Charge Coupled Devices, Stellar Luminosity, Stellar Mass

Scientific paper

Speckle interferometric observations of the Population II astrometric binary star Mu Cas have been made at four epochs with a direct imaging CCD system. Using the available orbital data on the system, the masses of the stars have been found to be 0.728 +/- 0.049 solar mass and 0.171 +/- 0.008 solar mass. Application of the theoretical mass-luminosity law to the primary yields a helium abundance of 0.23 +/- 0.05 by mass for a metal abundance of Z = 0.0021 assuming a system age of 13 billion years.

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