AU Pegasi revisited: period evolution and orbital elements of a peculiar Type II Cepheid
| Autor: | Laszlo Szabados, G. Csörnyei |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Orbital elements
Physics Type II Cepheid Period (periodic table) 010308 nuclear & particles physics Cepheid variable Diagram Astronomy and Astrophysics Astrophysics 01 natural sciences Cosmology Radial velocity Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science 0103 physical sciences Tidal force sense organs skin and connective tissue diseases 010303 astronomy & astrophysics |
| Zdroj: | Astrophysics and Space Science. 364 |
| ISSN: | 1572-946X 0004-640X |
| Popis: | New analysis on the period changes of Type II Cepheid AU Peg is presented. The available recent photometric measurements were collected and analysed with various methods. The period has been found to be constant for certain time intervals, although increasing in overall, in contrast with the previous expectations, which suggested the period change to reverse. Superimposed on overall period change, a formerly unknown periodic behaviour has been found in the $O-C$ diagram of AU Peg, which cannot be matched to the radial velocity variations. Since the Cepheid is a member of a binary system, it is probable that the unusual period change is in connection with the companion's tidal force. The orbital elements of the binary system involving AU Peg have been also revised. Comment: 8 pages, 8 figures, accepted for publication in Astrophysics and Space Science |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink