Long-term photometric monitoring with the Mercator telescope Frequencies and multicolour amplitudes of γ Doradus stars

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Authors
Cuypers, J.
Aerts, C.
De Cat, P.
De Ridder, J.
Goossens, K.
Schoenaers, C.
Uytterhoeven, K.
Acke, B.
Davignon, G.
Debosscher, J.
Decin, L.
De Meester, W.
Deroo, P.
Drummond, R.
Kolenberg, K.
Lefever, K.
Raskin, G.
Reyniers, M.
Saesen, S.
Vandenbussche, B.
Van Malderen, R.
Verhoelst, T.
Van Winckel, H.
Waelkens, C.
Discipline
Physical sciences
Subject
Amplitude ratios
Asteroseismology
Frequency Analysis
Gravity modes
HIPPARCOS
Mode identification
Passbands
Photometric monitoring
Photometric systems
Stars: oscillations
Stars: variables: general
Stellar interior
Techniques: photometric
Gravitational effects
Optical instruments
Optical telescopes
Photometry
Telescopes
Stars
Audience
Scientific
Date
2009Metadata
Show full item recordDescription
Context. γ Dor stars are excellent targets for asteroseismology since the gravity modes present in these stars probe the deep stellar interiors. Mode identification will improve the knowledge of these stars considerably. Aims. A selected group of γ Dor stars and some candidates were observed with the Mercator telescope to find and/or confirm the periodicities in the light variations and to derive reliable amplitude ratios in different pass bands. Methods. A frequency analysis was performed on all new data obtained in the Geneva photometric system. In order to have more reliable and accurate frequencies, the new data were combined with similar data from the literature and with Hipparcos observations. A set of frequencies that minimized the residuals in a harmonic fit was searched for while allowing means and amplitudes to vary from one observation set to another. Results. Frequencies and amplitudes in the photometric passbands of the Geneva system are given for 21 γ Dor stars. We report the discovery of HD 74504 as a newly found γ Dor star. Conclusions. Our study provides the first extensive multicolour database for the understanding of gravity modes in F-type stars. © ESO 2009.
Citation
Cuypers, J.; Aerts, C.; De Cat, P.; De Ridder, J.; Goossens, K.; Schoenaers, C.; Uytterhoeven, K.; Acke, B.; Davignon, G.; Debosscher, J.; Decin, L.; De Meester, W.; Deroo, P.; Drummond, R.; Kolenberg, K.; Lefever, K.; Raskin, G.; Reyniers, M.; Saesen, S.; Vandenbussche, B.; Van Malderen, R.; Verhoelst, T.; Van Winckel, H.; Waelkens, C. (2009). Long-term photometric monitoring with the Mercator telescope Frequencies and multicolour amplitudes of γ Doradus stars. , Astronomy and Astrophysics, Vol. 499, Issue 3, 967-982, DOI: 10.1051/0004-6361/200911691.Identifiers
scopus: 2-s2.0-66949132457
Type
Article
Peer-Review
Yes
Language
eng