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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 606351.0, MPI für Astronomie / Publikationen_mpia
HD 135344B: a young star has reached its rotational limit
Authors:Müller, A.; van den Ancker, M. E.; Launhardt, R.; Pott, J. U.; Fedele, D.; Henning, T.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:Astronomy and Astrophysics
Start Page:id.A85
Audience:Not Specified
Abstract / Description:<BR /> Aims: We search for periodic variations in the radial velocity of the young Herbig star HD 135344B to determine a rotation period. <BR /> Methods: We analyze 44 high-resolution optical spectra taken over a time period of 151 days. The spectra were acquired with FEROS at the 2.2 m MPG/ESO telescope in La Silla. The stellar parameters of HD 135344B are determined by fitting synthetic spectra to the stellar spectrum. To obtain radial velocity measurements, the stellar spectra are cross-correlated with a theoretical template computed from determined stellar parameters. <BR /> Results: We report the first direct measurement of the rotation period of a Herbig star from radial velocity measurements. The rotation period is found to be 0.16 d (3.9 h), which makes HD 135344B a rapid rotator at or close to its break-up velocity. The rapid rotation could explain some of the properties of the circumstellar environment of HD 135344B such as an inner disk with properties (composition, inclination) that differ significantly from the outer disk. Based on observations collected at the European Southern Observatory, La Silla, Chile (Program ID: 084.A-9016, 085.A-9027, 085.A-9024.
Free Keywords:stars: activity; stars: atmospheres; stars: fundamental parameters; stars: mass-loss; stars: pre-main sequence; stars: variables: T Tauri; Herbig Ae/Be
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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