Period Changes in the SX Phoenicis Star DY Pegasi

Details Period Changes in the SX Phoenicis Star DY Pegasi Period Changes in the SX Phoenicis Star DY Pegasi

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasp..116..543h&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 116, Issue 820, pp. 543-553.

Astronomy and Astrophysics

Astronomy

6

Stars: Variables: Δ Scuti

Scientific paper

We report 69 new times of maximum light for the SX Phoenicis star DY Pegasi. Combining these new times with previous published maxima, we found the data to be well modeled with a triple linear fit. However, we also determined a refined constant period change of -6.00×10-12 days day-1. From both spectroscopic and photometric measurements, we determined -0.8<[Fe/H]<-0.6. Using phase-averaged indices, we found =7660 and =3.89. From evolutionary models, a mass of M=1.5 Msolar and an age of 1.7 Gyr were determined.

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