GS305+04-26: Revisiting the interstellar medium around the Centaurus OB1 stellar association

Context. Massive stars deeply modify their surrounding interstellar medium (ISM) via their high throughput of ionizing photons and their strong stellar winds. In this way, they may create large expanding structures of neutral gas. Aims. We study a new large neutral hydrogen (Hi) shell, labelled GS30...

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Detalles Bibliográficos
Autores principales:	Corti, Mariela Alejandra, Arnal, Edmundo Marcelo, Orellana, Rosa Beatriz
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2012
Materias:	Ciencias Astronómicas Galaxy: kinematics and dynamics Galaxy: structure ISM: bubbles ISM: structure Open clusters and associations: individual: Cen OB1 Radio lines: ISM
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/84549
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-84549
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: kinematics and dynamics Galaxy: structure ISM: bubbles ISM: structure Open clusters and associations: individual: Cen OB1 Radio lines: ISM
spellingShingle	Ciencias Astronómicas Galaxy: kinematics and dynamics Galaxy: structure ISM: bubbles ISM: structure Open clusters and associations: individual: Cen OB1 Radio lines: ISM Corti, Mariela Alejandra Arnal, Edmundo Marcelo Orellana, Rosa Beatriz GS305+04-26: Revisiting the interstellar medium around the Centaurus OB1 stellar association
topic_facet	Ciencias Astronómicas Galaxy: kinematics and dynamics Galaxy: structure ISM: bubbles ISM: structure Open clusters and associations: individual: Cen OB1 Radio lines: ISM
description	Context. Massive stars deeply modify their surrounding interstellar medium (ISM) via their high throughput of ionizing photons and their strong stellar winds. In this way, they may create large expanding structures of neutral gas. Aims. We study a new large neutral hydrogen (Hi) shell, labelled GS305+04-26, and its relationship with the OB association Cen OB1. Methods. To carry out this study, we have used a multi-wavelength approach. We analyse both Hi line data retrieved from the Leiden-Argentina-Bonn (LAB) survey and new spectroscopic optical observations obtained at CASLEO, as well as make use of proper motion databases available from CDS. Results. The analysis of the Hi data reveals a large expanding structure GS305+04-26 centred at (l,b) = (305°, + 4°) in the velocity range from-33 to-17 km s -1. Based on its central velocity of-26 km s -1 and using standard galactic rotation models, a distance of 2.5 ± 0.9 kpc is inferred. This structure, elliptical in shape, has a major and minor axis of 440 and 270 pc, respectively. Its expansion velocity, total gaseous mass, and kinetic energy are ~8 km s -1, (2.4 ± 0.5) × 10 5 M âŠ(tm), and (1.6 ± 0.4) × 10 50 erg, respectively. Several stars of the OB-association Cen OB1 are seen projected onto, and within, the boundaries of GS305+04-26. Based on an analysis of proper motions, new members of Cen OB1 are identified. The mechanical energy injected by these stars could have been the origin of this Hi structure.
format	Articulo Articulo
author	Corti, Mariela Alejandra Arnal, Edmundo Marcelo Orellana, Rosa Beatriz
author_facet	Corti, Mariela Alejandra Arnal, Edmundo Marcelo Orellana, Rosa Beatriz
author_sort	Corti, Mariela Alejandra
title	GS305+04-26: Revisiting the interstellar medium around the Centaurus OB1 stellar association
title_short	GS305+04-26: Revisiting the interstellar medium around the Centaurus OB1 stellar association
title_full	GS305+04-26: Revisiting the interstellar medium around the Centaurus OB1 stellar association
title_fullStr	GS305+04-26: Revisiting the interstellar medium around the Centaurus OB1 stellar association
title_full_unstemmed	GS305+04-26: Revisiting the interstellar medium around the Centaurus OB1 stellar association
title_sort	gs305+04-26: revisiting the interstellar medium around the centaurus ob1 stellar association
publishDate	2012
url	http://sedici.unlp.edu.ar/handle/10915/84549
work_keys_str_mv	AT cortimarielaalejandra gs3050426revisitingtheinterstellarmediumaroundthecentaurusob1stellarassociation AT arnaledmundomarcelo gs3050426revisitingtheinterstellarmediumaroundthecentaurusob1stellarassociation AT orellanarosabeatriz gs3050426revisitingtheinterstellarmediumaroundthecentaurusob1stellarassociation
bdutipo_str	Repositorios
_version_	1764820488882749441

GS305+04-26: Revisiting the interstellar medium around the Centaurus OB1 stellar association

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