Title: A study of bright southern slowly pulsating B stars - III. Mode identification for singly-periodic targets in spectroscopy
Authors: De Cat, P
Briquet, Maryline
Daszynska-Daszkiewicz, J
Dupret, MA
De Ridder, Joris
Scuflaire, R
Aerts, Conny #
Issue Date: Mar-2005
Publisher: E d p sciences
Series Title: Astronomy & astrophysics vol:432 issue:3 pages:1013-1024
Abstract: We present the results of the mode identification for a sample of 7 bright southern slowly pulsating B stars showing one pulsation frequency in the.. 413 nm Si II profiles. We combined the results from ( 1) the method of photometric amplitudes; ( 2) the moment method; and ( 3) the amplitude and phase variation across the profile to search for the l and m values of the modes best fitting the data. It is the first time that the applicability of these techniques is tested to a sample of main-sequence g-mode pulsators. Combining the moment method with the amplitude and phase variations across the observed line profile gives an improvement in spectroscopic identification of low degree l g-mode pulsations. Using the variations of the higher order even moments [v(4)] and [v(6)] of the moment method solutions can also help. For HD181558, HD24587, HD140873 and HD177863, the photometric and spectroscopic results are compatible and point towards ( l, m) = ( 1, + 1) sectoral modes. For HD215573, HD53921 and HD92287, the results are inconclusive. Our proposed methodology for mode identification is also applicable to gamma Doradus stars.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
# (joint) last author

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