Journal Article

Spectroscopic pulsational frequency identification and mode determination of γ Doradus star HD12901<sup>⋆</sup>

E. Brunsden, K. R. Pollard, P. L. Cottrell, D. J. Wright and P. De Cat

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 3, pages 2512-2522
Published in print December 2012 | ISSN: 0035-8711
Published online December 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.22125.x
Spectroscopic pulsational frequency identification and mode determination of γ Doradus star HD12901⋆

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Abstract

Using multisite spectroscopic data collected from three sites, the frequencies and pulsational modes of the γ Doradus star HD 12901 were identified. A total of six frequencies in the range 1–2 d−1 were observed, their identifications supported by multiple line-profile measurement techniques and previously published photometry. Five frequencies were of sufficient signal-to-noise ratio for mode identification, and all five displayed similar three-bump standard deviation profiles which were fitted well with (l,m) = (1,1) modes. These fits had reduced χ2 values of less than 18. We propose that this star is an excellent candidate to test models of non-radially pulsating γ Doradus stars as a result of the presence of multiple (1,1) modes.

Keywords: line: profiles; techniques: spectroscopic; stars: individual: HD12901; stars: oscillations; stars: variables: general

Journal Article.  6563 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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