Computer Science
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983geocr...6.....f&link_type=abstract
GEOS Circular on RR Lyr Type Variables, No. RR 6, 9 p. (1983)
Computer Science
Rr Lyrae Stars:Blazhko Effect, Periods
Scientific paper
The 0.4 mag amplitude RRs star BP Peg has been observed in 1976 and 1977, mainly at the GEOS summer camp of St. Rome (France) by 7 visual observers. More than 2400 estimates have been completed leading to the determination of 74 times of maximum. A significantly negative mean O-C has been found with respect to Broglia's ephemeris (1959). Nevertheless, we still have to assume the constancy of the period since 1953, as our new period and Broglia's are consistent within the error bars. The new derived ephemeris is, for the fundamental period: Max = hel. JD 2,443,014.5786(+/-12) + 0.109543375(+/-25) E (error bars at 95% level of confidence). A good mean curve has been obtained using the 0.084510 day period of the 0.1 mag secondary oscillation. This oscillation has not escaped detection by all of the more productive visual observers, which is an excellent result and a good confirmation of Broglia's determination of the beat period.
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