Mode characterisation in delta Scuti stars. I. rho Pup, GN And, V1208 Aql and AV Cet

Details Mode characterisation in delta Scuti stars. I. rho Pup, GN And, V1208 Aql and AV Cet Mode characterisation in delta Scuti stars. I. rho Pup, GN And, V1208 Aql and AV Cet

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...386..964d&link_type=abstract

Astronomy and Astrophysics, v.386, p.964-970 (2002)

Astronomy and Astrophysics

Astrophysics

6

Stars: Oscillations, Stars: Variables: Delta Sct, Stars: Individual: Gn And

Scientific paper

We present new spectroscopic observations of four bright delta Scuti pulsators. Line indices of the Balmer lines can be used to establish mode identifications using the ratio R between such line index amplitudes and photometric amplitudes. For the well known radial pulsator rho Pup an absolute value of the amplitude ratio of the radial mode was found to R=0.43, consistent with earlier values of R ~ 0.5 reported for other delta Scuti stars. In GN And we recover the recently reported newly excited mode, while the former dominant mode was not recovered. We confirm that V1208 Aql is a non-radial pulsator, containing two modes of different degree. In V1208 Aql we report a previously unseen mode behavior: the phases of both modes are reversed between the core and wings of the Hβ line, suggesting the presence of more undetected modes. For AV Cet we find that the dominant mode is a previously undetected one. We suggest the undertaking of new photometric observations of rho Pup, GN And, V1208 Aql and AV Cet to determine the frequencies and amplitudes of the pulsations. Based in part on observations made with the Danish 1.5-m telescope at ESO, La Silla, Chile.

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