Abstract

ALTON, K. B.. CCD Photometry and Evolutionary Status of the Hads Variable PT Com. Rev. mex. astron. astrofis [online]. 2022, vol.58, n.1, pp.109-119.  Epub Jan 23, 2023. ISSN 0185-1101.  https://doi.org/10.22201/ia.01851101p.2022.58.01.09.

Multi-color (BV Ic) CCD-derived photometric data were acquired from PT Com, a pulsating variable classified as a high amplitude δ Scuti-type system. Analysis of precise time-series lightcurve data was accomplished using discrete Fourier transformation which revealed a mean fundamental mode (f 0) of oscillation at 12.178364 ± 0.000083 d-1 along with at least three other partial harmonics (2f 0, 3f 0 and 4f 0). No other statistically significant frequency shared by all bandpasses was resolved following successive pre-whitening of each residual signal. A secular analysis of the fundamental pulse period since 1999 was facilitated by the addition of 35 new times-of-maximum. The evolutionary status, age and physical nature of PT Com were investigated using the PAdova & TRieste Stellar Evolution Code for generating stellar tracks and isochrones.

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