Monoperiodic $δ$ Scuti star UY Cam: an analogue of SX Phe and RR Lyr-type variables

Details Monoperiodic $δ$ Scuti star UY Cam: an analogue of SX Phe and RR Lyr-type variables Monoperiodic $δ$ Scuti star UY Cam: an analogue of SX Phe and RR Lyr-type variables

2003-08-05

arxiv.org/abs/astro-ph/0308071v1

Astronomy and Astrophysics

Astrophysics

16 pages, 6 figures, 8 tables, accepted for publication in AJ (Nov. 2003)

Scientific paper

10.1086/378710

We present the results of a four-year photometric study of the high-amplitude $\delta$ Scuti star (HADS) UY Camelopardalis. Analyses on the available data from 1985 to 2003 show that UY Cam is monoperiodic. Fourier solutions for individual data sets do not reveal period changes in the star. Although forced parabolic fits to the $O-C$ residuals indicate measurable period change, the distribution of the data points in $O-C$ diagram and the deviations between fits and observations suggest the period change is still not established. We evidence the presence of cycle-to-cycle and longer time-scale amplitude variations. The pulsation amplitude seemed to change from 1985 to 2000s, but it kept constant in 2000--2003. UY Cam locates in the upper portion of the instability region of $\delta$ Sct variables. Photometric properties and estimated physical parameters reveal that UY Cam is an interesting object concerning its poorer metallicity, longer period, higher luminosity, lower surface gravity and larger radius among the HADS. UY Cam could be a younger (age=0.7$\pm$0.1 Gyr) Population I HADS with poor metal abundances (Z=0.004) evolving on its post main sequence shell hydrogen-burning evolutionary phase. UY Cam intervenes among the Pop. I/II HADS and RRc Lyr variables. These characteristics suggest the star to be an analogue of HADS, SX Phe and RRc Lyr-type variables.

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