Determination of stellar parameters of rapidly rotating massive stars

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dc.contributor.advisorSupervisor: Cure, Michael
dc.contributor.advisorCo-supervisor: Arcos, Catalina
dc.contributor.advisorExternal reviewer: Levenhagen, Ronaldo
dc.contributor.authorTuris Gallo, Daniela
dc.date.accessioned2024-06-04T14:50:11Z
dc.date.available2024-06-04T14:50:11Z
dc.date.issued2023-03
dc.description.abstractFast rotation directly affects the shape of the observed spectral lines. Therefore, sev- eral physical considerations must be considered when using stellar atmosphere mod- els to obtain stellar parameters. In this work, we used the code ZPEKTR, which con- siders the oblate shape of the stars due to the high rotational velocities, limb darken- ing, and gravity darkening effects. The code divides the stellar surface into a triangu- lar mesh with approximately 120000 area elements. Each one is assigned a TLUSTY model with its effective temperature, log g, and radius; the model depends on the in- clination angle of the star. We applied this code to obtain the stellar parameters of ten classical Be stars and two extremely metal-poor O stars. We create a grid of models for each star and use the chi-square test to determine the best fit to the observed HeI 4471A˚ (Be stars) and CIII 1176A˚ (O stars) spectral lines. Comparing our results of the inclination angle with data from the literature obtained using interferometry, we can conclude that with a small telescope and using spectroscopic techniques, we can find an accurate value for i. For future work, we will use the code for many fast-rotating stars and increase the number of photospheric lines used.
dc.identifier.urihttps://repositoriobibliotecas.uv.cl/handle/uvscl/13878
dc.language.isoen
dc.publisherUniversidad de Valparaíso
dc.subjectESTRELLAS MULTIPLES
dc.subjectROTACION DE ESTRELLAS
dc.subjectESPECTROSCOPIA ASTRONOMICA
dc.titleDetermination of stellar parameters of rapidly rotating massive stars
dc.typeThesis
uv.catalogadorPJR CIEN
uv.colectionTesis
uv.departamentoFacultad de Ciencias. Instituto de Física y Astronomía

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Tesis postgrado Astrofísica