Non-radial pulsations in be stars : preparation of the corot space mission
NAGIOS: RODERIC FUNCIONANDO

Non-radial pulsations in be stars : preparation of the corot space mission

DSpace Repository

Non-radial pulsations in be stars : preparation of the corot space mission

Show simple item record

dc.contributor.advisor Fabregat Llueca, Juan es_ES
dc.contributor.author Gutiérrez Soto, Juan es_ES
dc.contributor.other Universitat de València - FÍSICA TEÒRICA es_ES
dc.date.accessioned 2010-07-07T15:33:21Z
dc.date.available 2010-07-07T15:33:21Z
dc.date.issued 2006 es_ES
dc.date.submitted 2006-12-15 es_ES
dc.identifier.uri http://www.tesisenred.net/TDX-0113110-095658/ es_ES
dc.identifier.uri http://hdl.handle.net/10550/15799
dc.format.mimetype application/pdf es_ES
dc.language cat-en-es es_ES
dc.rights eng es_ES
dc.rights Copyright information available at source archive es_ES
dc.subject Small Magellanic Clouds es_ES
dc.subject COROT es_ES
dc.subject Astersoseismology es_ES
dc.subject Be stars es_ES
dc.title Non-radial pulsations in be stars : preparation of the corot space mission es_ES
dc.type info:eu-repo/semantics/doctoralThesis es_ES
dc.description.abstractenglish The general objective of the present work is to contribute to the knowledge of the physics of Be Stars. In particular, we are interested in studying and characterizing their pulsational properties. A very suitable tool to reach this goal is the study and analysis of photometric time series with the maximum time baseline, density and photometric accuracy. The space mission COROT scheduled to be launched in December 2006, will provide ultra high precision, relative stellar photometry for very long continuous observing runs. Up to ten stars will be observed in the seismology fields with a photometric accuracy of a few 10-4 and color information during 150 days. The observations of Be stars with COROT will provide photometric time series with unprecedented quality. Their analysis will allow us to qualitatively improve our knowledge and understanding of the pulsational characteristics of Be stars. In consequence, we have started a research project aimed at observing Be stars both in the seismology and exoplanet fields of COROT. In this thesis we present the first step of this project, which is the preparation and study of the sample of Be stars that will be observed by COROT. We have performed photometric analysis of all Be stars located in the seismology fields (Chap. 2). Special emphasis has been given to two stars (NW Ser and V1446 Aql) in which we have detected multiperiodic variability and these variations have been modeled in terms of stellar pulsations (Chap. 3). We have also performed an in-depth spectroscopic study of NW Ser and identified the non-radial pulsating modes taking into account the rotational effects (Chap. 4). A technique to search for faint Be stars based on CCD photometry has been developed and is presented in Chap. 5. We also present a list of faint Be stars located in the exoplanet fields of COROT detected with this technique and which we propose as targets for COROT. In addition, we have proven that our period-analysis techniques are suitable to detect multiperiodicity in large temporal baseline data. In particular, we have detected non-radial pulsations in some Be stars in the low-metallicity galaxy Small Magellanic Clouds (Chap. 6). The current theoretical models do not predict the presence of pulsational instabilities in such low-metallicity environment, and therefore, our results point towards the necessity of new and improved models. es_ES

View       (7.302Mb)

This item appears in the following Collection(s)

Show simple item record

Search DSpace

Advanced Search

Browse

Statistics