RW Per - Nodal motion changes its amplitude by 1.4 mag

Details RW Per - Nodal motion changes its amplitude by 1.4 mag RW Per - Nodal motion changes its amplitude by 1.4 mag

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..208s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Jan. 1991, p. 208-213.

Astronomy and Astrophysics

Astronomy

13

B Stars, Eclipsing Binary Stars, K Stars, Stellar Motions, Charge Coupled Devices, Light Curve, Stellar Color, Stellar Spectrophotometry

Scientific paper

RW Per was found to have large secular changes in its eclipse amplitude. In blue light, for example, the amplitude was 3.2 mag in the early 1900s, 2.2 mag in the late 1960s, and 1.75 mag in 1990. Throughout this time, the brightness at maximum was constant in all colors. It is shown that the only possible explanation is nodal motion, where the inclination varies with a period of roughly 100,000 yr. The nodal motion is caused by a third star, for which the light curve, the colors, and the O - C curve already provide evidence. Thus, RW Per is only the fourth known star with large changes of eclipse amplitude and is only the second example of nodal motion.

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