A first-overtone RR Lyrae star with cyclic period changes

Details A first-overtone RR Lyrae star with cyclic period changes A first-overtone RR Lyrae star with cyclic period changes

2004-07-20

arxiv.org/abs/astro-ph/0407420v1

Astronomy and Astrophysics

Astrophysics

6 pages, 6 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.08242.x

A detailed light curve analysis is presented for a first-overtone RR Lyrae star, MACHO* J050918.712-695015.31, based on MACHO and OGLE-III observations. As a foreground object of the Large Magellanic Cloud, it gives an extraordinary opportunity to study an almost continuous, 12-year long dataset of a relatively bright (V~15.0 mag) RRc star with rapid period change. Cyclic period modulation is suggested by the O-C method, where the cycle length is about 8 years. With the available unique dataset, we could draw strong limits on other light curve changes that may be associated to the period modulation. We could exclude both multiple periodicity and amplitude modulation unambiguously. Any theoretical model should reproduce the observed lack of photometric modulations. Simple arguments are also given for possible hydromagnetic effects.

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