Bibcode
DOI
Fox Machado, L.; Michel, E.; Pérez Hernández, F.; Peña, J. H.; Li, Z. P.; Chevreton, M.; Belmonte, J. A.; Álvarez, M.; Parrao, L.; Dupret, M.-A.; Pau, S.; Fernandez, A.; Michel, J. P.; Michel, R.; Pani, A.
Referencia bibliográfica
The Astronomical Journal, Volume 134, Issue 2, pp. 860-866.
Fecha de publicación:
8
2007
Número de citas
8
Número de citas referidas
5
Descripción
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.