Ruprecht 55: An OB association at the edge of our Galaxy

We present new spectroscopy in the optical range and 21-cm Hi data covering the Ruprecht 55 (Ru 55) field in the Puppis window where several authors have proposed the existence of one (or two) clusters. We have determined new MK spectral types for about 50 stars in the region, finding 43 OB-type sta...

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Detalles Bibliográficos
Autores principales: Bosch, Guillermo Luis, Barbá, Rodolfo Héctor, Morrell, Nidia Irene, Niemelä, Virpi Sinikka, Ostrov, Pablo Gabriel, Arnal, Edmundo Marcelo, Cappa, Cristina Elisabet, Morras, Ricardo, Giménez de Castro, Guillermo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2003
Materias:
Ciencias Astronómicas
Galaxy: Structure
ISM: Bubbles
ISM: Kinematics and dynamics
Open clusters and associations: Individual: Ruprecht 55
Stars: Early-type
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84555
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84555
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
Galaxy: Structure
ISM: Bubbles
ISM: Kinematics and dynamics
Open clusters and associations: Individual: Ruprecht 55
Stars: Early-type
spellingShingle Ciencias Astronómicas
Galaxy: Structure
ISM: Bubbles
ISM: Kinematics and dynamics
Open clusters and associations: Individual: Ruprecht 55
Stars: Early-type
Bosch, Guillermo Luis
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Niemelä, Virpi Sinikka
Ostrov, Pablo Gabriel
Arnal, Edmundo Marcelo
Cappa, Cristina Elisabet
Morras, Ricardo
Giménez de Castro, Guillermo
Ruprecht 55: An OB association at the edge of our Galaxy
topic_facet Ciencias Astronómicas
Galaxy: Structure
ISM: Bubbles
ISM: Kinematics and dynamics
Open clusters and associations: Individual: Ruprecht 55
Stars: Early-type
description We present new spectroscopy in the optical range and 21-cm Hi data covering the Ruprecht 55 (Ru 55) field in the Puppis window where several authors have proposed the existence of one (or two) clusters. We have determined new MK spectral types for about 50 stars in the region, finding 43 OB-type stars among them. LS 985 was found to be an O9 V + 09.5 III binary and it is the earliest type of star in our observed sample. We have identified a stellar OB association (Ru 55), which is most likely related to a depletion detected in our H I data, as: (i) they are located at the same distance (6 kpc), within observational errors; (ii) both have similar radial velocities (∼67 km s<SUP>-1</SUP>); (iii) current OB stars could have provided the energy needed to blow the cavity; (iv) the dynamical time-scale for the hole buildup matches the age estimated for the earliest OB stars; and (v) LS 985 might be responsible for ionizing the Hi cavity inner walls close to it.
format Articulo
Articulo
author Bosch, Guillermo Luis
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Niemelä, Virpi Sinikka
Ostrov, Pablo Gabriel
Arnal, Edmundo Marcelo
Cappa, Cristina Elisabet
Morras, Ricardo
Giménez de Castro, Guillermo
author_facet Bosch, Guillermo Luis
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Niemelä, Virpi Sinikka
Ostrov, Pablo Gabriel
Arnal, Edmundo Marcelo
Cappa, Cristina Elisabet
Morras, Ricardo
Giménez de Castro, Guillermo
author_sort Bosch, Guillermo Luis
title Ruprecht 55: An OB association at the edge of our Galaxy
title_short Ruprecht 55: An OB association at the edge of our Galaxy
title_full Ruprecht 55: An OB association at the edge of our Galaxy
title_fullStr Ruprecht 55: An OB association at the edge of our Galaxy
title_full_unstemmed Ruprecht 55: An OB association at the edge of our Galaxy
title_sort ruprecht 55: an ob association at the edge of our galaxy
publishDate 2003
url http://sedici.unlp.edu.ar/handle/10915/84555
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bdutipo_str Repositorios
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