AU Pegasi revisited: period evolution and orbital elements of a peculiar Type II Cepheid

Csörnyei, Géza and Szabados, László (2019) AU Pegasi revisited: period evolution and orbital elements of a peculiar Type II Cepheid. ASTROPHYSICS AND SPACE SCIENCE, 364 (9). ISSN 0004-640X

Preview

Text 1909.01255.pdf Download (521kB) | Preview

Abstract

New analysis on the period changes of Type II Cepheid AU Peg is presented. The available recent photometric measurements were collecte and analysed with various methods. The period has been found to b constant for certain time intervals, although increasing in overall, i contrast with the previous expectations, which suggested the perio change to reverse. Superimposed on overall period change, a formerl unknown periodic behaviour has been found in the O-C diagram of AU Peg which cannot be matched to the radial velocity variations. Since th Cepheid is a member of a binary system, it is probable that the unusua period change is in connection with the companion's tidal force. Th orbital elements of the binary system involving AU Peg have been als revised.

Actions (login required)

Edit Item