Astron. J., 134, 860-866 (2007/August-0)
Multisite observations of δ Scuti stars 7 Aql and 8 Aql (a new δ Scuti variable): the twelfth STEPHI campaign in 2003.
FOX MACHADO L., MICHEL E., PEREZ HERNANDEZ F., PENA J.H., LI Z.P., CHEVRETON M., BELMONTE J.A., ALVAREZ M., PARRAO L., DUPRET M.-A., PAU S., FERNANDEZ A., MICHEL J.P., MICHEL R. and PANI A.
Abstract (from CDS):
We present an analysis of the pulsation behavior of the δ Scuti stars 7 Aql (HD 174532) and 8 Aql (HD 174589), a new variable star, observed in the framework of the STEPHI XII campaign during 2003 June and July; 183 hr of high-precision photometry were acquired by using four-channel photometers at three sites on three continents during 21 days. The light curves and amplitude spectra were obtained following a classical scheme of multichannel photometry. Observations in different filters were also obtained and analyzed. Six and three frequencies have been unambiguously detected above a 99% confidence level in the range 190-300 µHz and 100-145 µHz in 7 Aql and 8 Aql, respectively. A comparison of observed and theoretical frequencies shows that 7 Aql and 8 Aql may oscillate with p-modes of low radial orders, typical among δ Scuti stars. In terms of radial oscillations the range of 8 Aql goes from n=1 to 3, while for 7 Aql the range spans from n=4 to 7. Nonradial oscillations have to be present in both stars as well. The expected range of excited modes according to a nonadiabatic analysis goes from n=1 to 6 in both stars.
Stars: Variables: δ Scuti - stars: individual (HD 174532) - stars: individual (HD 174589) - Stars: Oscillations - Techniques: Photometric
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