Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-19
Astronomy and Astrophysics
Astrophysics
7 pages (in A&A style), 7 eps figures. Accepted for A&A Main Journal
Scientific paper
10.1051/0004-6361:20011623
The first intensive photometric time-series of a Delta Scuti star was obtained from space. Theta2 Tau was monitored with the star camera on the Wide-Field Infrared Explorer (WIRE) satellite. Twelve independent frequencies were detected down to the 0.5 mmag amplitude level. Their reality was investigated by searching for them using two different algorithms and by some internal checks. All the frequencies are in the range 10.8-14.6 c\d. The histogram of the frequency spacings shows that 81% are below 1.8 c\d; rotation may thus play a role in the mode excitation. The fundamental radial mode is not observed, although it is expected to occur in a region where the noise level is very low (55 micromag). The rms residual is about two times lower than that usually obtained from successful ground--based multisite campaigns. The comparison of the results of previous campaigns with the new ones establishes the amplitude variability of some modes.
Buzasi Derek
Catanzarite Joe
Conrow Tim
Laher Russ R.
Poretti Ennio
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