Long-term photometric monitoring with the Mercator telescope. Frequencies and multicolour amplitudes of gamma Doradus stars
| Autor: | K. Goossens, Karolien Lefever, Sophie Saesen, Gert Raskin, Bram Acke, Conny Aerts, C. Schoenaers, Pieter Deroo, Katrien Kolenberg, G. Davignon, R. Drummond, L. Decin, Jonas Debosscher, T. Verhoelst, K. Uytterhoeven, Maarten Reyniers, W. De Meester, J. De Ridder, P. De Cat, Bart Vandenbussche, H. Van Winckel, J. Cuypers, C. Waelkens, R. Van Malderen |
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| Rok vydání: | 2009 |
| Předmět: |
oscillations [stars]
spaced data spectroscopy 010504 meteorology & atmospheric sciences candidates Astronomy variables Photometric system Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics multisite campaign 01 natural sciences Asteroseismology law.invention Telescope photometric [techniques] individual: &gamma Doradus [stars] law 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics pulsations 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Physics Frequency analysis Astronomy and Astrophysics calibration Astrophysics - Astrophysics of Galaxies individual: gamma doradus [stars] Stars Amplitude Space and Planetary Science variables [stars] variables: general [stars] oscillations Harmonic ComputingMethodologies_DOCUMENTANDTEXTPROCESSING time-series analysis Astrophysics::Earth and Planetary Astrophysics Mercator projection |
| Zdroj: | Astronomy & Astrophysics, 499, 967-982 Astronomy & Astrophysics, 499, 3, pp. 967-982 |
| ISSN: | 0004-6361 |
| DOI: | 10.26093/cds/vizier.34990967 |
| Popis: | Gamma Doradus 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. A selected group of Gamma Doradus 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. 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 the residuals in a harmonic fit was searched for while allowing means and amplitudes to vary from one observation set to another. Frequencies and amplitudes in the photometric passbands of the Geneva system are given for 21 Gamma Doradus stars. We report the discovery of HD 74504 as a newly found Gamma Doradus star. Our study provides the first extensive multicolour database for the understanding of gravity modes in F-type stars. Comment: Electronic tables (5 to 25) not included in this version |
| Databáze: | OpenAIRE |
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