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RW Per - Nodal motion changes its amplitude by 1.4 magRW 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.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Schaefer, Bradley E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fried, Robert E.
(Braeside Observatory Flagstaff, AZ, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Astronomical Journal
Volume: 101
ISSN: 0004-6256
Subject Category
Accession Number
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