Reference : The B-type variable HD 131120 modelled by rotational modulation
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/132479
The B-type variable HD 131120 modelled by rotational modulation
English
Briquet, Maryline mailto [KULeuven > Instituut voor Sterrenkunde > > >]
De Cat, P. [Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Heverlee, Belgium]
Aerts, C. [Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Heverlee, Belgium]
Scuflaire, Richard [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Evol. et stabilité des étoiles et des amas d'étoiles (ESEA)]
1-Dec-2001
Astronomy and Astrophysics
EDP Sciences
380
177-185
Yes (verified by ORBi)
0004-6361
1432-0746
Les Ulis
France
[en] STARS: EARLY-TYPE ; STARS: VARIABLES ; STARS: INDIVIDUAL: HD 131120
[en] We present ground-based multi-colour Geneva photometry and high-resolution spectra of the variable B-type star HD 131120. All sets of data reveal a monoperiodic star with a period of 1.569 days. We compare the variability of the star with a non-radial g-mode pulsation model and with a rotational modulation model. The latter model appears to be the best explanation for the observed line-profile variations of the star. Moreover, contrary to the pulsational model, it is able to reproduce the behaviour of the first three moments of the Si and He lines as well as the large variability of their equivalent width. We therefore remove the star from the list of new Slowly Pulsating B stars found from Hipparcos data. Based on observations obtained with the Swiss photometric telescope and ESO's CAT/CES telescope, both situated at La Silla, Chile.
http://hdl.handle.net/2268/132479
10.1051/0004-6361:20011340
http://esoads.eso.org/abs/2001A%26A...380..177B

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