Title: Long-term multicolour photometry and high-resolution spectroscopy of the two gamma Doradus stars HD 12901 and HD 48501
Authors: Aerts, Conny
Cuypers, J
De Cat, P
Dupret, MA
De Ridder, Joris
Eyer, L
Scuflaire, R
Waelkens, Christoffel #
Issue Date: Mar-2004
Publisher: E d p sciences
Series Title: Astronomy & astrophysics vol:415 issue:3 pages:1079-1088
Abstract: We gathered long-term multicolour Geneva UB(1)BB(2)V(1)VG photometric and high-resolution (R = 40000) spectroscopic data of the two gamma Doradus stars HD 12901 and HD48501. The photometry reveals three frequencies for each of the two stars: f(1) = 1.21563 c d(-1). f(2) = 1.39594 c d(-1) and f(3) = 2.18636 c d(-1) for HD 12901 and f(1) = 1.09408 c d(-1), f(2) = 1.29054 c d(-1) and f(3) = 1.19924 c d(-1) for HD 48501. The photometric amplitude is each time largest in the Geneva B-1 filter and the variations in all the different filters are perfectly in phase within the measurement errors. Mode identification points out that the six modes are all ( = I modes and that the non-adiabatic temperature variations are extremely small, in contradiction to current,theoretical predictions. Our spectra show that all the observed frequencies are intrinsic to the stars and cannot be due to binarity. We detect clear line-profile variations at low amplitude (<1 km s(-1)) due to the oscillations of both targets. The estimated v sin i from the spectra are &SIM;53 km s(-1) for HD 12901 and &SIM;29 km s(-1) for HD 48501. It is at present unclear if the triplet-like structure for HD 48501 is the consequence of rotational splitting or of the large separation expected for high-order gravity modes in the asymptotic regime.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
# (joint) last author

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