CCD Photometry of Field RR Lyrae Stars. Period Changes of SV ERI and XX and

Details CCD Photometry of Field RR Lyrae Stars. Period Changes of SV ERI and XX and CCD Photometry of Field RR Lyrae Stars. Period Changes of SV ERI and XX and

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jass...13....1j&link_type=abstract

Journal of Astronomy and Space Science, vol. 13, no. 1, p.1-8.

Astronomy and Astrophysics

Astronomy

Scientific paper

CCD time series photometry was performed for two Oosterhoff type ¥± field RR Lyrae stars, SV Eri and XX And, to construct light curves in B and V bands. The maximum light times from our observations were combined with those in the literature to construct phase shift diagrams, from which we determined the period change rates ¥â. We obtained large positive period change rates for these stars, which are expected from current evolutionary models if these stars are evolving rapidly from blue to red toward the end of core helium burning phase.

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