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Artículo

The little-studied cluster Berkeley 90. I. LS III +46 11: a very massive O3.5 If* + O3.5 If* binary

Maíz Apellániz, J. ; Negueruela, I.; Barbá, R. H. ; Walborn, N. R.; Pellerin, A.; Simón Díaz, S.; Sota, A.; Marco, A.; Alonso Santiago, J.; Sanchez Bermudez, J.; Gamen, Roberto ClaudioIcon ; Lorenzo, J.
Fecha de publicación: 07/2015
Editorial: Edp Sciences
Revista: Astronomy And Astrophysics
ISSN: 0004-6361
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

Context. It appears that most (if not all) massive stars are born in multiple systems. At the same time, the most massive binaries are hard to find owing to their low numbers throughout the Galaxy and the implied large distances and extinctions. Aims. We want to study LS III +46 11, identified in this paper as a very massive binary; another nearby massive system, LS III +46 12; and the surrounding stellar cluster, Berkeley 90. Methods. Most of the data used in this paper are multi-epoch high S/N optical spectra, although we also use Lucky Imaging and archival photometry. The spectra are reduced with dedicated pipelines and processed with our own software, such as a spectroscopicorbit code, CHORIZOS, and MGB. Results. LS III +46 11 is identified as a new very early O-type spectroscopic binary [O3.5 If* + O3.5 If*] and LS III +46 12 as another early O-type system [O4.5 V((f))]. We measure a 97.2-day period for LS III +46 11 and derive minimum masses of 38.80 ± 0.83 M and 35.60 ± 0.77 M for its two stars. We measure the extinction to both stars, estimate the distance, search for optical companions, and study the surrounding cluster. In doing so, a variable extinction is found as well as discrepant results for the distance. We discuss possible explanations and suggest that LS III +46 12 may be a hidden binary system where the companion is currently undetected.
Palabras clave: Spectroscopic Binaries , Extinction , Interstellar Medium , Early Type Stars , Ls Iii +46 11 (Estrella) , Open Clusters , Aassociations , Berkeley 90
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/12789
DOI: http://dx.doi.org/10.1051/0004-6361/201526123
URL: http://www.aanda.org/articles/aa/abs/2015/07/aa26123-15/aa26123-15.html
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Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Maíz Apellániz, J. ; Negueruela, I.; Barbá, R. H. ; Walborn, N. R.; Pellerin, A.; et al.; The little-studied cluster Berkeley 90. I. LS III +46 11: a very massive O3.5 If* + O3.5 If* binary; Edp Sciences; Astronomy And Astrophysics; 579; 7-2015; 108-120
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