Issue |
A&A
Volume 492, Number 1, December II 2008
|
|
---|---|---|
Page(s) | 167 - 169 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:200810952 | |
Published online | 01 October 2008 |
SMEI observations of previously unseen pulsation frequencies in
Doradus
School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK e-mail: njt@bison.ph.bham.ac.uk
Received:
11
September
2008
Accepted:
22
September
2008
Aims. As g-mode pulsators, gamma-Doradus-class stars may naïvely be expected to show a large number of modes. Taking advantage of the long photometric time-series generated by the solar mass ejection imager (SMEI) instrument, we have studied the star gamma Doradus to determine whether any other modes than the three already known are present at observable amplitude.
Methods. High-precision photometric data from SMEI taken between April 2003 and March 2006 were subjected to periodogram analysis with the PERIOD04 package.
Results. We confidently determine three additional frequencies at 1.39, 1.87, and 2.743 d-1. These are above and beyond the known frequencies of 1.320, 1.364, and 1.47 d-1.
Conclusions. Two of the new frequencies, at 1.39 and 1.87 d-1, are speculated to be additional modes of oscillation, with the third frequency at 2.743-1 a possible combination frequency.
Key words: stars: individual: γ Doradus / stars: oscillations / stars: early-type / stars: variables: general
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.