Article (Scientific journals)
A diagnostic diagram for gamma Doradus variables and slowly pulsating B-type stars
Takata, M.; Ouazzani, R.-M.; Saio, H. et al.
2020In Astronomy and Astrophysics, 635, p. 106
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Abstract :
[en] Pulsating variables of γ Doradus type (γ Dor) and slowly pulsating B-type (SPB) stars are found on and near the main sequence with typical periods varying between one and several days, making them rather hard to detect from the ground. It is only with space missions such as CoRoT and Kepler that we became truly capable of determining their oscillation frequencies with enough precision to perform in-depth analyses. Here we present an efficient and easy-to-implement seismic tool, in which the frequency (ν) and the square root of the frequency difference () are plotted against each other as the abscissa and the ordinate, respectively. This allows us to immediately (1) perform mode identification; (2) estimate the average rotation rate and the characteristic period of gravity modes; and (3) recognise certain physical effects, including buoyancy glitches and avoided crossings. This diagnostic tool can only be applied to prograde sectoral g modes. To validate the tool presented here, we used stellar models and also applied it to three γ Dor (KIC 12066947, KIC 5608334 and KIC 4846809) and one SPB star (KIC 3459297), all observed with Kepler. Furthermore, we show that the rotation rates determined using this new tool are consistent with the results of previous studies.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Takata, M.
Ouazzani, R.-M.
Saio, H.
Christophe, S.
Ballot, J.
Antoci, V.
Salmon, Sébastien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Hijikawa, K.
Language :
English
Title :
A diagnostic diagram for gamma Doradus variables and slowly pulsating B-type stars
Publication date :
March 2020
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
635
Pages :
A106
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 March 2020

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