The O-C Diagram of CS 1246

Details The O-C Diagram of CS 1246 The O-C Diagram of CS 1246

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..548b&link_type=abstract

17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 548-553 (2010).

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Dwarf Stars, Photometry, Stellar Mass, Astronomical Ephemerides, Fourier Analysis, Least Mean Squares Methods, Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, Photometric, Polarimetric, And Spectroscopic Instrumentation, Masses, Ephemerides, Almanacs, And Calendars, Fourier Analysis, Interpolation, Curve Fitting

Scientific paper

We present the O-C diagram for CS 1246, a pulsating subdwarf B star dominated by a single, large-amplitude pulsation mode. Using the PROMPT telescopes, we collected nearly 400 hours of photometry over 14 months to look for secular variations in the pulse timings. Interestingly, the O-C diagram is dominated by a sine wave with a period of 14.1 days and an amplitude near 11 light-seconds. Underneath this sinusoid is a secular trend implying a decrease in the pulsational period of -1.9×10-11, which we attribute to a contraction of the star. The sinusoidal oscillation could be produced by the presence of a low-mass companion with a minimum mass near 0.12 Msun.

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