Article (Scientific journals)
The B-type variable HD 131120 modelled by rotational modulation
Briquet, Maryline; De Cat, P.; Aerts, C. et al.
2001In Astronomy and Astrophysics, 380, p. 177-185
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Keywords :
STARS: EARLY-TYPE; STARS: VARIABLES; STARS: INDIVIDUAL: HD 131120
Abstract :
[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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Briquet, Maryline ;  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 - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Evol. et stabilité des étoiles et des amas d'étoiles (ESEA)
Language :
English
Title :
The B-type variable HD 131120 modelled by rotational modulation
Publication date :
01 December 2001
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
380
Pages :
177-185
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 October 2012

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