ORBi: Salmon Sébastien - Can an underestimation of opacity explain B-type pulsators in the SMC?

Reference : Can an underestimation of opacity explain B-type pulsators in the SMC?


	Document type :	Scientific congresses and symposiums : Paper published in a journal
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/112097

Title :	Can an underestimation of opacity explain B-type pulsators in the SMC?
Language :	English
Author, co-author :	Salmon, Sébastien [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
	Montalban Iglesias, Josefa [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
	Miglio, Andrea [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
	Dupret, Marc-Antoine [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
	Morel, Thierry [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)]
	Noels-Grötsch, Arlette [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Publication date :	9-Oct-2010
Journal title :	Astronomische Nachrichten
Publisher :	Wiley
Volume :	331
Issue/season :	9-10
Special issue title :	Proceedings of the 4th HELAS International Conference: Seismological Challenges for Stellar Structure
Pages :	electronic supplement
Audience :	International
ISSN :	0004-6337
e-ISSN :	1521-3994
City :	Berlin
Country :	Germany
Event name :	4th HELAS International Conference: Seismological Challenges for Stellar Structure
Event date :	1-5 février 2010
Event organizer :	Instituto de Astrofísica de Canarias
Event place (city) :	Arrecife
Event country :	Lanzarote
Keywords :	[en] Astrophysics - Solar and Stellar Astrophysics
Abstract :	[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.
Target :	Researchers ; Students
Permalink :	http://hdl.handle.net/2268/112097
	also: http://hdl.handle.net/2268/132625
Other URL :	http://adsabs.harvard.edu/abs/2010arXiv1007.3088S
Commentary :	Proceedings of the 4th HELAS International Conference: "Seismological Challenges for Stellar Structure"

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