On the change of period of DY Pegasi

Details On the change of period of DY Pegasi On the change of period of DY Pegasi

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982acaps...2...44j&link_type=abstract

(Acta Astrophysica Sinica, vol. 2, 1982, p. 44-48.) Chinese Astronomy and Astrophysics, vol. 6, June 1982, p. 97-100. Translati

Astronomy and Astrophysics

Astrophysics

4

Cepheid Variables, Stellar Spectrophotometry, Light Curve, Time Measurement, Variability

Scientific paper

A high-speed three-channel photon-counting photometer was used on three nights to observe DY Peg, an ultrashort-period Cepheid of the AI Vel type. Seven epochs of maximum and two sets of O-C values are determined. The results are combined with data obtained over the past 30 yr to recalculate both the equation for the epoch of maximum and the rate of period change. The period decay rate is found to be (6.3 + or - 0.2) x 10 to the -12th day/day, which corresponds to a period decrease of (3.1 + or - 0.1) x 10 to the -8th per yr. It is concluded that certain random factors are present in the star's period changes.

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