Resolution of the halo binary MU CAS at optical wavelengths

Details Resolution of the halo binary MU CAS at optical wavelengths Resolution of the halo binary MU CAS at optical wavelengths

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..898k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 92, Oct. 1986, p. 898-902.

Astronomy and Astrophysics

Astronomy

5

Binary Stars, Subdwarf Stars, Visible Spectrum, Helium, Resolution, Stellar Composition, Stellar Luminosity, Stellar Mass, Stellar Orbits

Scientific paper

The faint secondary of the Population II binary system μ Cas has been detected at 850 nm, using a two-dimensional photon-counting camera and speckle-imaging techniques. The reconstructed image of the μ Cas binary system permitted a determination of the position angle (63°±2°) and separation (1arcsec.118±0arcsec.023) of μ Cas B, and its magnitude difference from the primary (Δm ≈ 5 at 850 nm). Using these results together with existing astrometric measurements the authors estimated the masses of the components. Since errors in the mass estimates are still dominated by errors in the astrometric data, no definitive estimate of the helium abundance could be derived. However, using mean values for the masses and Z = 0.005, the authors estimated Y = 0.21 for μ Cas A, which is consistent with their estimate of the helium abundance for μ Cas B (0.20 ≤ Y ≤ 0.25).

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