Study of the population II Cepheid AU Pegasi

Details Study of the population II Cepheid AU Pegasi Study of the population II Cepheid AU Pegasi

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279..410v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 2, p. 410-416

Astronomy and Astrophysics

Astrophysics

8

Binary Stars, Cepheid Variables, Electrophotometry, Globular Clusters, Stellar Spectra, Stellar Spectrophotometry, Color-Magnitude Diagram, Electrophotometers, Light Curve, Phase Diagrams, Radial Velocity, Stellar Orbits

Scientific paper

New photoelectric B and V observations of the Population II Cepheid AU Peg are presented. The available photometric measurements are collected from the literature and all data are analyzed with several period-finding methods. The period variation has been found to be non-linear, and between 1986 and 1990 the period increase stopped and seems to reverse. Since this Cepheid is a member of a binary system where proximity of the components is a deterministic factor, it is probable that the pulsation is perturbed by the companion's tidal force. However, such a period variation can hardly be explained by tidal interaction alone. The surface brightness analysis resulted in new absolute parameters indicating that AU Peg is on the red edge of the instability strip.

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