Two White Dwarfs with Substellar Companions

Details Two White Dwarfs with Substellar Companions Two White Dwarfs with Substellar Companions

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1512h&link_type=abstract

American Astronomical Society, AAS Meeting #211, #15.12; Bulletin of the American Astronomical Society, Vol. 39, p.765

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Precise relative astrometry gives the parallax and proper motion of nearby stars. Some targets show an additional perturbation from an otherwise unseen companion. These data can be used to measure the orbital elements of the target, including the inclination. With an assumed mass of the target, they also give the mass of the companion. Here we present two examples from the Naval Observatory's 1.55-m Strand Astrometric Reflector in Flagstaff. The precise astrometry gives parallax errors near 0.5 mas and errors in the semi-major axis better than 10 percent. These two white dwarfs both are likely to have substellar brown dwarf companions.

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