Volume 463, Number 1, February III 2007
|Page(s)||225 - 232|
|Section||Stellar structure and evolution|
|Published online||20 November 2006|
Is 44 Tauri an exceptional case among the δ Scuti stars?
Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria e-mail: email@example.com
2 Max Planck Institut für Astronomie, 69117 Heidelberg, Königstuhl 17, Germany
3 Instituto de Astrofisica de Andalucia, CSIC, Apdo. 3004, 18080 Granada, Spain
Accepted: 13 September 2006
Aims.This paper investigates the pulsational behavior of the exceptionally slow rotating δ Scuti star 44 Tau.
Methods.During 2000 and 2003 we carried out a photometric observing campaign and obtained 470 h of Strömgren photometry (v and y).
Results.We observed 29 pulsational frequencies, from which 16 linear combinations were detected. Amplitude variations were found to be significant for three frequencies. Furthermore a close frequency pair was derived. The pulsational constant Q has been calculated for all frequencies. The radial fundamental and the first overtone were identified based on Q and the positive phase shifts in all three observing seasons. Additionally we found evidence for the presence of g modes. The newly derived value of the projected rotational velocity of = 2 ± 1 km s-1 is discussed.
Conclusions.Fast rotation can be excluded, but there are no evident proofs to favor slow rotation or pole-on view.
Key words: stars: variables: δ Sct / stars: oscillations / stars: individual: 44 Tau / techniques: photometric
© ESO, 2007
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