Open clusters : I. Fundamental parameters of B stars in NGC 3766 and NGC 4755

Context. Spectroscopic investigations of galactic open clusters are scarce and limited to a reduced sample of cluster members. Aims. We intend to perform a complete study of the physical parameters of two galactic clusters as well as of their individual members. Methods. To carry out this study, w...

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Detalles Bibliográficos
Autores principales:	Aidelman, Yael Judith, Cidale, Lydia Sonia, Zorec, Juan, Arias, María Laura
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2012
Materias:	Ciencias Astronómicas Open clusters and associations: individual: NGC 3766 Open clusters and associations: individual: NGC 4755 Stars: early-type Stars: emission-line, Be Stars: fundamental parameters
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/84712
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-84712
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas Open clusters and associations: individual: NGC 3766 Open clusters and associations: individual: NGC 4755 Stars: early-type Stars: emission-line, Be Stars: fundamental parameters
spellingShingle	Ciencias Astronómicas Open clusters and associations: individual: NGC 3766 Open clusters and associations: individual: NGC 4755 Stars: early-type Stars: emission-line, Be Stars: fundamental parameters Aidelman, Yael Judith Cidale, Lydia Sonia Zorec, Juan Arias, María Laura Open clusters : I. Fundamental parameters of B stars in NGC 3766 and NGC 4755
topic_facet	Ciencias Astronómicas Open clusters and associations: individual: NGC 3766 Open clusters and associations: individual: NGC 4755 Stars: early-type Stars: emission-line, Be Stars: fundamental parameters
description	Context. Spectroscopic investigations of galactic open clusters are scarce and limited to a reduced sample of cluster members. Aims. We intend to perform a complete study of the physical parameters of two galactic clusters as well as of their individual members. Methods. To carry out this study, we used the BCD (Barbier-Chalonge-Divan) spectrophotometric system, which is based on the study of the Balmer discontinuity and is independent of interstellar and circumstellar extinction. Additional physical properties were derived from the line profiles (FWHM) and stellar evolution models. We analyzed low-resolution spectra around the Balmer discontinuity for normal B-type and Be stars in two open clusters: NGC 3766 and NGC 4755. We determined the stellar fundamental parameters, such as effective temperatures, surface gravities, spectral types, luminosity classes, absolute and bolometric magnitudes, and color gradient excesses. The stellar rotation velocity was also determined. Complementary information, mainly stellar mass, age, and radius of the star population were calculated using stellar evolution models. In some cases, the stellar fundamental parameters were derived for the first time. The obtained results allowed us also to determine the reddening, age, and distance to the clusters. Results. The cluster parameters obtained through the BCD method agree very well with those derived from classical methods based on photometric data. The BCD system also provides physical properties of the star members. This study enables us to test the good behavior of M<sub>bol</sub>(λ₁,D)-calibrations and detect systematic discrepancies between log g estimates from model atmospheres and those derived from stellar evolution models. To improve our knowledge on the formation and evolution of the clusters, more statistical studies on the initial mass luminosity and angular momentum distributions should be addressed. Therefore, the BCD spectrophotometric system could be a powerful tool for studying far galactic and extragalactic clusters with the generation of large telescopes and the multi-object technique.
format	Articulo Articulo
author	Aidelman, Yael Judith Cidale, Lydia Sonia Zorec, Juan Arias, María Laura
author_facet	Aidelman, Yael Judith Cidale, Lydia Sonia Zorec, Juan Arias, María Laura
author_sort	Aidelman, Yael Judith
title	Open clusters : I. Fundamental parameters of B stars in NGC 3766 and NGC 4755
title_short	Open clusters : I. Fundamental parameters of B stars in NGC 3766 and NGC 4755
title_full	Open clusters : I. Fundamental parameters of B stars in NGC 3766 and NGC 4755
title_fullStr	Open clusters : I. Fundamental parameters of B stars in NGC 3766 and NGC 4755
title_full_unstemmed	Open clusters : I. Fundamental parameters of B stars in NGC 3766 and NGC 4755
title_sort	open clusters : i. fundamental parameters of b stars in ngc 3766 and ngc 4755
publishDate	2012
url	http://sedici.unlp.edu.ar/handle/10915/84712
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bdutipo_str	Repositorios
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Open clusters : I. Fundamental parameters of B stars in NGC 3766 and NGC 4755

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