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

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 th...

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Autores: Maíz Apellániz, Jesús, Negueruela, I., Barbá, R. H., Walborn, N. R., Pellerín, A., Simon-Diaz, S., Sota Ballano, Alfredo, Marco, A., Alonso-Santiago, J., Sánchez Bermúdez, Joel, Gamen, R. C., Lorenzo, J.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/133832
Acceso en línea:http://hdl.handle.net/10261/133832
Access Level:acceso abierto
Palabra clave:Stars: early-type
Binaries: spectroscopic
Dust, extinction
ISM: lines and bands
Stars: individual: LS III+46 11
Open clusters and associations: individual: Berkeley 90
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spelling The little-studied cluster Berkeley 90: I. LS III +46 11: A very massive O3.5 If∗ + O3.5 If∗ binaryMaíz Apellániz, JesúsNegueruela, I.Barbá, R. H.Walborn, N. R.Pellerín, A.Simon-Diaz, S.Sota Ballano, AlfredoMarco, A.Alonso-Santiago, J.Sánchez Bermúdez, JoelGamen, R. C.Lorenzo, J.Stars: early-typeBinaries: spectroscopicDust, extinctionISM: lines and bandsStars: individual: LS III+46 11Open clusters and associations: individual: Berkeley 90Context. 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 spectroscopic-orbit 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.J.M.A. and A.S. acknowledge support from [a] the Spanish Government Ministerio de Economia y Competitividad (MINECO) through grants AYA2010-15 081, AYA2010-17631, and AYA2013-40611-P and [b] the Consejeria de Educacion of the Junta de Andalucia through grant P08-TIC-4075. J.M.A. was also supported by the George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy and he is grateful to the Department of Physics and Astronomy at Texas A&M University for their hospitality during some of the time this work was carried out. I.N., A.M., J.A., and J.L. acknowledge support from [a] the Spanish Government Ministerio de Econoia y Competitividad (MINECO) through grant AYA2012-39364-C02-01/02, [b] the European Union, and [c] the Generalitat Valenciana through grant ACOMP/2014/129. R.H.B. acknowledges support from FONDECYT Project 1140076. S.S.-D. acknowledges funding by [a] the Spanish Government Ministerio de Economia y Competitividad (MINECO) through grants AYA2010-21697-C05-04, AYA2012-39 364-C02-01, and Severo Ochoa SEV-2011-0187 and [b] the Canary Islands Government under grant PID2 010 119. J.S.-B. acknowledges support by the JAE-PreDoc program of the Spanish Consejo Superior de Investigaciones Cientificas (CSIC). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.Peer ReviewedEDP SciencesGobierno de CanariasGeneralitat ValencianaConsejo Superior de Investigaciones Científicas (España)NASAMinisterio de Economía y Competitividad (España)European CommissionJunta de AndalucíaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2016201620152016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/133832reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2013-40611-PSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1338322026-05-22T06:33:51Z
dc.title.none.fl_str_mv The little-studied cluster Berkeley 90: I. LS III +46 11: A very massive O3.5 If∗ + O3.5 If∗ binary
title The little-studied cluster Berkeley 90: I. LS III +46 11: A very massive O3.5 If∗ + O3.5 If∗ binary
spellingShingle The little-studied cluster Berkeley 90: I. LS III +46 11: A very massive O3.5 If∗ + O3.5 If∗ binary
Maíz Apellániz, Jesús
Stars: early-type
Binaries: spectroscopic
Dust, extinction
ISM: lines and bands
Stars: individual: LS III+46 11
Open clusters and associations: individual: Berkeley 90
title_short The little-studied cluster Berkeley 90: I. LS III +46 11: A very massive O3.5 If∗ + O3.5 If∗ binary
title_full The little-studied cluster Berkeley 90: I. LS III +46 11: A very massive O3.5 If∗ + O3.5 If∗ binary
title_fullStr The little-studied cluster Berkeley 90: I. LS III +46 11: A very massive O3.5 If∗ + O3.5 If∗ binary
title_full_unstemmed The little-studied cluster Berkeley 90: I. LS III +46 11: A very massive O3.5 If∗ + O3.5 If∗ binary
title_sort The little-studied cluster Berkeley 90: I. LS III +46 11: A very massive O3.5 If∗ + O3.5 If∗ binary
dc.creator.none.fl_str_mv Maíz Apellániz, Jesús
Negueruela, I.
Barbá, R. H.
Walborn, N. R.
Pellerín, A.
Simon-Diaz, S.
Sota Ballano, Alfredo
Marco, A.
Alonso-Santiago, J.
Sánchez Bermúdez, Joel
Gamen, R. C.
Lorenzo, J.
author Maíz Apellániz, Jesús
author_facet Maíz Apellániz, Jesús
Negueruela, I.
Barbá, R. H.
Walborn, N. R.
Pellerín, A.
Simon-Diaz, S.
Sota Ballano, Alfredo
Marco, A.
Alonso-Santiago, J.
Sánchez Bermúdez, Joel
Gamen, R. C.
Lorenzo, J.
author_role author
author2 Negueruela, I.
Barbá, R. H.
Walborn, N. R.
Pellerín, A.
Simon-Diaz, S.
Sota Ballano, Alfredo
Marco, A.
Alonso-Santiago, J.
Sánchez Bermúdez, Joel
Gamen, R. C.
Lorenzo, J.
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Gobierno de Canarias
Generalitat Valenciana
Consejo Superior de Investigaciones Científicas (España)
NASA
Ministerio de Economía y Competitividad (España)
European Commission
Junta de Andalucía
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Stars: early-type
Binaries: spectroscopic
Dust, extinction
ISM: lines and bands
Stars: individual: LS III+46 11
Open clusters and associations: individual: Berkeley 90
topic Stars: early-type
Binaries: spectroscopic
Dust, extinction
ISM: lines and bands
Stars: individual: LS III+46 11
Open clusters and associations: individual: Berkeley 90
description 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 spectroscopic-orbit 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.
publishDate 2015
dc.date.none.fl_str_mv 2015
2016
2016
2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/133832
url http://hdl.handle.net/10261/133832
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2013-40611-P
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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