The δ Scuti star FG Vir. V. The 2002 photometric multisite campaign
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 d...
Saved in:
Published in | Astronomy and astrophysics (Berlin) Vol. 419; no. 2; pp. 695 - 701 |
---|---|
Main Authors | , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Les Ulis
EDP Sciences
01.05.2004
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | 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. |
---|---|
Bibliography: | ark:/67375/80W-STBNX9R8-T other:2004A%26A...419..695B publisher-ID:aa0830 istex:F781D8F82FB566FBF926B4546A08B4931721D0FB ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0004-6361 1432-0746 |
DOI: | 10.1051/0004-6361:20035830 |