Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992geoce..20.....m&link_type=abstract
GEOS Circular on Eclipsing Binaries, No. EB 20, 8 p. (1992)
Physics
Scientific paper
RT UMi is an EA-type variable, discovered in 1958 by Strohmeier by means of photographic plates. Its most recent ephemeris was proposed by Santis and Tempesti in 1977: Min I = JD 2,441,306.2902 + 1.841962*E. In this paper, by means of 40 times of minimum obtained visually by GEOS members, plus 22 times of minimum from photographic plates taken at Sonneberg Observatory, the following ephemeris has been found: Min I = JD 2,441,306.321 + 1.8419735*E. Significant O-C values still result, so it follows that RT UMi has a variable period, on a time scale of several thousands of days. It is not possible to establish the type of period variation (whether erratic or periodic).
Berthold Th.
Maraziti A.
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