A Period Investigation of the SX Phoenicis Star DY Pegasi

Details A Period Investigation of the SX Phoenicis Star DY Pegasi A Period Investigation of the SX Phoenicis Star DY Pegasi

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aj....139.2639l&link_type=abstract

The Astronomical Journal, Volume 139, Issue 6, pp. 2639-2642 (2010).

Astronomy and Astrophysics

Astronomy

Stars: Individual: Dy Pegasi, Stars: Variables: Delta Scuti, Techniques: Photometric

Scientific paper

We measure two new times of light maximum of the SX Phoenicis star DY Pegasi in 2008 December and collect 410 pe/CCD times of light maximum that had been published. These data could be modeled with a nonlinear fit including a continuously decreasing period change (dP/dt = -9.04 × 10-12 days day-1) and a periodic change with a period of 42.2 yr. If this periodic change is caused by the light traveling time effect of an orbital motion of DY Pegasi in a binary system, the deduced mass of the companion could be 0.028 M sun and it is probably a brown dwarf.

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