6. An Astrometric Study of Van Maanen'S Star
- 1 January 1971
- journal article
- research article
- Published by Cambridge University Press (CUP) in Symposium - International Astronomical Union
- Vol. 42, 32-34
- https://doi.org/10.1017/s0074180900097059
Abstract
Van Maanen's star (1950: 0h46.m5, + 5°.09′) is a white dwarf (visual magnitude 12.4, spectrum DF) with a proper motion of 2″.95 in 155°.5 and parallax 0″.234. An early determination of radial velocity yielded +238 km/sec (Adams and Joy, 1926). It was suggested by Russell and Atkinson (1931) that van Maanen's star might show a very large Einstein shift of at least +700 km/sec. Oort (1932) pointed out that the observed value of +238 km/sec is incompatible with the theory of galactic rotation: this would support the Einstein shift interpretation.Keywords
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