Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...463..225a&link_type=abstract
Astronomy and Astrophysics, Volume 463, Issue 1, February III 2007, pp.225-232
Astronomy and Astrophysics
Astrophysics
15
Stars: Variables: Δ Sct, Stars: Oscillations, Stars: Individual: 44 Tau, Techniques: Photometric
Scientific paper
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 v sin i = 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.
Antoci Victoria
Bischof K.
Breger Michel
Garrido Rafa
Rodler Florian
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