J/PAZh/36/600 ASAS 101538-5933.1 BV light curves (Berdnikov, 2010) ================================================================================ Search for evolutionary changes in Cepheid periods using the Harvard plate collection: ASAS 101538-5933.1. Berdnikov L.N. =2010PAZh...36..600B =2010AstL...36..569B ================================================================================ ADC_Keywords: Stars, variable ; Photometry, UBV Keywords: Cepheids, period variability, stellar evolution Abstract: In the plate collection of the Harvard College Observatory, we have obtained 528 photographic magnitude estimates for the recently discovered long-period classical Cepheid ASAS 101538-5933.1 (P=51.4-days). Together with the published photoelectric and CCD observations, our data have allowed us to construct an O-C diagram spanning a time interval of 120 years. The O-C diagram has the shape of a parabola, which has made it possible to determine for the first time the quadratic light elements and to calculate the rate of evolutionary increase in the period, dP/dt=51.8(+/-4.8)s/yr or (dP/dt)/P=7.3(+/-0.7)s, in agreement with the results of theoretical calculations for the third crossing of the instability strip. The available data reduced by the method of Eddington and Plakidis reveal small random period fluctuations that do not distort the evolutionary trend in the O-C residuals. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 10 15 38.0 -59 33 05 ASAS J101538-5933.1 = V* V708 Car ---------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table3.dat 19 200 Standard B and V light curves for ASAS 101538-5933.1 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 F5.3 --- Phase Phase 7- 12 F6.3 mag Bmag B magnitude 14- 19 F6.3 mag Vmag V magnitude -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 11-Apr-2013