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dc.contributor.author
Aidelman, Yael Judith
dc.contributor.author
Cidale, Lydia Sonia
dc.contributor.author
Zorec, Juan
dc.contributor.author
Panei, Jorge Alejandro
dc.date.available
2017-03-20T14:06:06Z
dc.date.issued
2015-05
dc.identifier.citation
Aidelman, Yael Judith; Cidale, Lydia Sonia; Zorec, Juan ; Panei, Jorge Alejandro; Open clusters: II fundamental parameters of B stars in Collinder 223, Hogg 16, NGC2645, NGC3114, and NGC6025; Edp Sciences; Astronomy And Astrophysics; 577; 5-2015; 45-62
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/14076
dc.description.abstract
Context. The knowledge of accurate values of effective temperature, surface gravity, and luminosity of stars in open clusters is very important not only to derive cluster distances and ages but also to discuss the stellar structure and evolution. Unfortunately, stellar parameters are still very scarce. Aims. Our goal is to study five open clusters to derive stellar parameters of the B and Be star population and discuss the cluster properties. In a near future, we intend to gather a statistically relevant samples of Be stars to discuss their origin and evolution. Methods. We use the Barbier-Chalonge-Divan spectrophotometric system, based on the study of low-resolution spectra around the Balmer discontinuity, since it is independent of the interstellar and circumstellar extinction and provides accurate Hertzsprung-Russell diagrams and stellar parameters. Results. We determine stellar fundamental parameters, such as effective temperatures, surface gravities, spectral types, luminosity classes, absolute and bolometric magnitudes and colour gradient excesses of the stars in the field of Collinder 223, Hogg 16,NGC2645, NGC3114, and NGC6025. Additional information, mainly masses and ages of cluster stellar populations, is obtained using stellar evolution models. In most cases, stellar fundamental parameters have been derived for the first time. We also discuss the derived cluster properties of reddening, age and distance. Conclusions. Collinder 223 cluster parameters are E(B − V) = 0.25 ± 0.03 mag and (mv − Mv)0 = 11.21 ± 0.25 mag. In Hogg 16, we clearly distinguish two groups of stars (Hogg 16a and Hogg 16b) with very different mean true distance moduli (8.91 ± 0.26 mag and 12.51 ± 0.38 mag), mean colour excesses (0.26 ± 0.03 mag and 0.63 ± 0.08 mag), and spectral types (B early-type and B late-/Atype stars, respectively). The farthest group could be merged with Collinder 272. NGC2645 is a young cluster (<14 Myr) with E(B − V) = 0.58±0.05 mag and (mv − Mv)0 = 12.18±0.30 mag. The cluster parameters of NGC 3114 are E(B − V) = 0.10 ± 0.01 mag and (mv − Mv)0 = 9.20 ± 0.15 mag. This cluster presents an important population of Be star, but it is difficult to define the cluster membership of stars because of the high contamination by field stars or the possible overlapping with a nearby cluster. Finally, we derive the following cluster parameters of NGC6025: E(B − V) = 0.34 ± 0.02 mag, (mv − Mv)0 = 9.25 ± 0.17 mag, and an age between 40 Myr and 69 Myr. In all the cases, new Be candidate stars are reported based on the appearance of a second Balmer discontinuity.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Edp Sciences
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Collinder 223
dc.subject
Fundamental Parameters
dc.subject
Emission Lines
dc.subject
Hogg 16
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Ngc 2645
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Ngc 3114
dc.subject
Ngc 6025
dc.subject
Be Stars
dc.subject.classification
Astronomía
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Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Open clusters: II fundamental parameters of B stars in Collinder 223, Hogg 16, NGC2645, NGC3114, and NGC6025
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-03-06T18:08:13Z
dc.journal.volume
577
dc.journal.pagination
45-62
dc.journal.pais
Francia
dc.journal.ciudad
Paris
dc.description.fil
Fil: Aidelman, Yael Judith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.description.fil
Fil: Cidale, Lydia Sonia. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
dc.description.fil
Fil: Zorec, Juan . Sorbonne Université; Francia
dc.description.fil
Fil: Panei, Jorge Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.journal.title
Astronomy And Astrophysics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2015/05/aa25085-14/aa25085-14.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201425085


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