Revised ephemeris for the eclipsing binary PP Lac.

Details Revised ephemeris for the eclipsing binary PP Lac. Revised ephemeris for the eclipsing binary PP Lac.

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990geoce..17.....m&link_type=abstract

GEOS Circular on Eclipsing Binaries, No. EB 17, 8 p. (1990)

Computer Science

Eclipsing Binaries:Ephemerides

Scientific paper

PP Lac is a variable discovered by W. J. Miller. It was at first classified as "EW or RR?", but later Figer and Rolland, from visual estimates made by GEOS, found it to be an EW-type eclipsing binary and gave the first ephemeris. In this paper, 128 minima observed visually by GEOS members from 1968 to 1988, plus 18 minima observed by BBSAG, are analysed. On the basis of these data, a more precise ephemeris can be computed: Min I (or II) = JD Hel 2,442,903.235(+/- 2) + 0.40116150(+/- 48)*E. It has been impossible to discriminate the primary minimum from the secondary one.

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