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...
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2015
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/86345 |
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I19-R120-10915-86345 |
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dspace |
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Universidad Nacional de La Plata |
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I-19 |
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R-120 |
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SEDICI (UNLP) |
| language |
Inglés |
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Ciencias Astronómicas Binaries: spectroscopic Dust, extinction ISM: lines and bands Open clusters and associations: individual: Berkeley 90 Stars: early-type Stars: individual: LS III +46 11 |
| spellingShingle |
Ciencias Astronómicas Binaries: spectroscopic Dust, extinction ISM: lines and bands Open clusters and associations: individual: Berkeley 90 Stars: early-type Stars: individual: LS III +46 11 Maíz Apellániz, J. Negueruela, I. Barbá, Rodolfo Héctor Walborn, N. R. Pellerin, A. Simón Díaz, S. Sota, A. Marco, A. Alonso Santiago, J. Sanchez Bermudez, J. Gamen, Roberto Claudio Lorenzo, J. The little-studied cluster Berkeley 90 : I. LS III +46 11: a very massive O3.5 If* + O3.5 If* binary |
| topic_facet |
Ciencias Astronómicas Binaries: spectroscopic Dust, extinction ISM: lines and bands Open clusters and associations: individual: Berkeley 90 Stars: early-type Stars: individual: LS III +46 11 |
| 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. |
| format |
Articulo Articulo |
| author |
Maíz Apellániz, J. Negueruela, I. Barbá, Rodolfo Héctor Walborn, N. R. Pellerin, A. Simón Díaz, S. Sota, A. Marco, A. Alonso Santiago, J. Sanchez Bermudez, J. Gamen, Roberto Claudio Lorenzo, J. |
| author_facet |
Maíz Apellániz, J. Negueruela, I. Barbá, Rodolfo Héctor Walborn, N. R. Pellerin, A. Simón Díaz, S. Sota, A. Marco, A. Alonso Santiago, J. Sanchez Bermudez, J. Gamen, Roberto Claudio Lorenzo, J. |
| author_sort |
Maíz Apellániz, J. |
| title |
The little-studied cluster Berkeley 90 : I. LS III +46 11: a very massive O3.5 If* + O3.5 If* binary |
| 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 |
little-studied cluster berkeley 90 : i. ls iii +46 11: a very massive o3.5 if* + o3.5 if* binary |
| publishDate |
2015 |
| url |
http://sedici.unlp.edu.ar/handle/10915/86345 |
| work_keys_str_mv |
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