High-resolution imaging from Mauna Kea - The astrometric binary MU Cassiopeiae

Details High-resolution imaging from Mauna Kea - The astrometric binary MU Cassiopeiae High-resolution imaging from Mauna Kea - The astrometric binary MU Cassiopeiae

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..647p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, April 1985, p. 647-651.

Astronomy and Astrophysics

Astronomy

5

Astrometry, Binary Stars, Orbital Elements, Subdwarf Stars, Charge Coupled Devices, Image Processing, Stellar Composition, Stellar Mass

Scientific paper

High-resolution CCD images of the Population II binary Mu Cassiopiae have been obtained at a wavelength of 1 micron, and the secondary star was detected. By averaging four short-exposure images, a composite image of FWHM = 0.43 arcsec was obtained. With subsequent model fitting, separation and position angles of 0.93 + or - 0.06, and 224.3 + or - 2.6 deg, were found, respectively. These data, combined with recent astrometric orbits yield masses of M(A) = 0.61 + or - 0.30 solar mass, and M(B) = 0.15 + or - 0.30. The dominant source of error was uncertainties in the astrometric orbital parameters. These results may provide further constraints on the orbital parameters and result in more interesting limits to the helium abundance.

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