Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88..120b&link_type=abstract
Astronomical Journal, vol. 88, Jan. 1983, p. 120-125.
Astronomy and Astrophysics
Astronomy
21
Astrometry, White Dwarf Stars, Orbital Elements, Photographic Plates, Stellar Luminosity, Stellar Motions, Stellar Oscillations, Stellar Parallax
Scientific paper
Astrometric studies are presented for 15 plate series on the Sproul photographic program which include known or suspected white dwarfs. The plate series are unusual for white dwarfs in that the mean time interval of the observations is as long as 20 yr. Parallaxes and relative proper motions are determined and the results analyzed for perturbations. Discussion of the lack of very low luminosity white dwarfs is given. One star, Ross 640, shows a suggestion of orbital motion with a P about 2 yr, which may be interpreted as caused by a very faint perturbing body of approximately equal mass. The quadruple system G107-69/70 is discussed.
Borgman E. R.
Lippincott Sarah Lee
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