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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 448361.0, MPI für Astronomie / Publikationen_mpia
Binarity and multiperiodicity in high-amplitude delta Scuti stars
Authors:Derekas, A.; Kiss, L. L.; Bedding, T. R.; Ashley, M. C. B.; Csák, B.; Danos, A.; Fernandez, J. M.; Furész, G.; Mészáros, Sz; Szabó, Gy M.; Szakáts, R.; Székely, P.; Szatmáry, K.
Language:English
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Volume:394
Start Page:995
End Page:1008
Review Status:not specified
Audience:Experts Only
Abstract / Description:We have carried out a photometric and spectroscopic survey of bright high-amplitude delta Scuti (HADS) stars. The aim was to detect binarity and multiperiodicity (or both) in order to explore the possibility of combining binary star astrophysics with stellar oscillations. Here, we present the first results for 10, predominantly southern, HADS variables. We detected the orbital motion of RS Gru with a semi-amplitude of ~6.5 kms-1 and 11.5 d period. The companion is inferred to be a low-mass dwarf star in a close orbit around RS Gru. We found multiperiodicity in RY Lep from both photometric and radial velocity data and detected orbital motion in the radial velocities with hints of a possible period of 500-700 d. The data also revealed that the amplitude of the secondary frequency is variable on the time-scale of a few years, whereas the dominant mode is stable. Radial velocities of AD CMi revealed cycle-to-cycle variations, which might be due to non-radial pulsations. We confirmed the multiperiodic nature of BQ Ind, while we obtained the first radial velocity curves of
Free Keywords:methods: observational; techniques: photometric; techniques: radial velocities; binaries: general; binaries: spectroscopic; delta Scuti
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009MNRAS.394..995D [ID No:1]
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