Reference : Can an underestimation of opacity explain B-type pulsators in the SMC?
Scientific congresses and symposiums : Paper published in a journal
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/112097
Can an underestimation of opacity explain B-type pulsators in the SMC?
English
Salmon, Sébastien mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
Montalban Iglesias, Josefa mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
Miglio, Andrea mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
Dupret, Marc-Antoine mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
Morel, Thierry mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)]
Noels-Grötsch, Arlette mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
9-Oct-2010
Astronomische Nachrichten
Wiley
331
9-10
Proceedings of the 4th HELAS International Conference: Seismological Challenges for Stellar Structure
electronic supplement
No
International
0004-6337
1521-3994
Berlin
Germany
4th HELAS International Conference: Seismological Challenges for Stellar Structure
1-5 février 2010
Instituto de Astrofísica de Canarias
Arrecife
Lanzarote
[en] Astrophysics - Solar and Stellar Astrophysics
[en] Slowly Pulsating B and ß Cephei are ĸ mechanism driven pulsating B stars. That ĸ mechanism works since a peak in the opacity due to a high number of atomic transitions from iron-group elements occurs in the area of log T ~ 5.3. Theoretical results predict very few SPBs and no ß Cep to be encountered in low metallicity environments such as the Small Magellanic Cloud. However recent variability surveys of B stars in the SMC reported the detection of a significant number of SPB and ß Cep candidates. Though the iron content plays a major role in the excitation of ß Cep and SPB pulsations, the chemical mixture representative of the SMC B stars such as recently derived does not leave room for a significant increase of the iron abundance in these stars. Whilst abundance of iron-group elements seems reliable, is the opacity in the iron-group elements bump underestimated? We determine how the opacity profile in B-type stars should change to excite SPB and ß Cep pulsations in early-type stars of the SMC.
Researchers ; Students
http://hdl.handle.net/2268/112097
also: http://hdl.handle.net/2268/132625
http://adsabs.harvard.edu/abs/2010arXiv1007.3088S
Proceedings of the 4th HELAS International Conference: "Seismological Challenges for Stellar Structure"

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