Pulsating B and Be stars in the Small Magellanic Cloud
NAGIOS: RODERIC FUNCIONANDO

Pulsating B and Be stars in the Small Magellanic Cloud

DSpace Repository

Pulsating B and Be stars in the Small Magellanic Cloud

Show simple item record

dc.contributor.author Diago Nebot, Pascual David
dc.contributor.author Gutiérrez Soto, Juan
dc.contributor.author Fabregat Llueca, Juan
dc.contributor.author Martayan, C.
dc.date.accessioned 2010-06-29T11:11:41Z
dc.date.available 2010-06-29T11:11:41Z
dc.date.issued 2008
dc.identifier.uri http://hdl.handle.net/10550/14023
dc.description.abstract Context. Stellar pulsations in main-sequence B-type stars are driven by the κ-mechanism due to the Fe-group opacity bump. The current models do not predict the presence of instability strips in the B spectral domain at very low metallicities. As the metallicity of the SMC is lower than Z = 0.005, it constitutes a very suitable object to test these predictions. Aims. The main objective is to investigate the existence of B-type pulsators at low metallicities, searching for short-term periodic variability in absorption-line B and Be stars in the SMC. The analysis has been performed in a sample of 313 B and Be stars with fundamental astrophysical parameters accurately determined from high-resolution spectroscopy. Methods. Photometric light curves of the MACHO project have been analyzed using standard Fourier techniques and linear and non- linear least squares fitting methods. The position of the pulsating stars in the HR diagram has been used to ascertain their nature and to map the instability regions in the SMC. Results. We have detected 9 absorption-line B stars showing short-period variability, two among them being multiperiodic. One star is most likely a β Cephei variable and the remaining 8 are SPB stars. The SPB instability strip in the SMC is shifted towards higher temperatures than the Galaxy. In the Be star sample, 32 stars are short-period variables, 20 among them multiperiodic. 4.9% of B stars and 25.3% of Be stars are pulsating stars. Conclusions. β Cephei and SPB stars do exist at the SMC metallicity. The fractions of SPB stars and pulsating Be stars in the SMC are lower than in the Galaxy. The fraction of pulsating Be stars in the SMC is much higher than the fraction of pulsating absorption-line B stars, as in the Galaxy. en
dc.language.iso en en
dc.relation http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361:20078754&Itemid=129 en
dc.source Diago, P. D., Gutiérrez-Soto, J., Fabregat, J. and Martayan, C. (2008): Pulsating B and Be stars in the Small Magellanic Cloud, Astronomy and Astrophysics, núm. 480, vol. 1, pp. 179-186 en
dc.subject Stars : emission-line, Be; stars : oscillations; Stars : early-type; Stars : statistics; Galaxies : Magellanic Clouds en
dc.title Pulsating B and Be stars in the Small Magellanic Cloud en
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Estrellas en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Galaxias en
dc.identifier.doi 10.1051/0004-6361:20078754 en
dc.description.private pascual.diago@uv.es; juan.gutierrez-soto@uv.es; fabregaj@uv.es en
dc.identifier.idgrec 040313 en

View       (6.437Mb)

This item appears in the following Collection(s)

Show simple item record

Search DSpace

Advanced Search

Browse

Statistics