The d scuti star FG vir. V. The 2002 photometric multisite campaign
- Author(s)
- Michel Breger, Florian Rodler, M L Pretorius, S Martin-Ruiz, Pedro J. Amado, Victor Costa, Rafael Garrido, P Lopez De Coca, I Olivares, Eloy Rodriguez, A Rolland, T Tshenye, Gerald Handler, Ennio Poretti, Jean Pierre Sareyan, M Alvarez, Pamela M. Kilmartin, Wolfgang Zima
- Abstract
A high-accuracy multisite campaign was carried out from 2002 January to May with a photometric coverage of 398 h at five observatories. The concentration on a few selected sites gives better consistency and accuracy than collecting smaller amounts from a larger number of sites. 23 frequencies were detected with a high statistical significance. 6 of these are new. The 17 frequencies found in common with the 1992-1995 data are the modes with highest amplitudes. This indicates that the pulsation spectrum of FG Vir is relatively stable over the ten-year period. Two frequencies have variable amplitudes and phases from year to year as well as during 2002. These were both found to be double modes with close frequencies. For the mode at 12.15 c/d this leads to an apparent modulation with a time scale of ~ 129 d. The close frequencies at 12.15 c/d are composed of a radial and a nonradial mode, suggesting a similarity with the Blazhko Effect seen in RR Lyrae stars.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- University of Cape Town, Instituto de Astrofísica de Andalucía (CSIC), North-West University, INAF Osservatorio Astronomico di Brera, Université Côte d'Azur, Observatorio Astronomico Nacional (IA-UNAM), University of Canterbury
- Journal
- Astronomy & Astrophysics
- Volume
- 419
- Pages
- 695-701
- No. of pages
- 7
- ISSN
- 0004-6361
- Publication date
- 2004
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/8bcd6ce2-af3a-4448-b348-fedcd7380cac