VLT observations of GRS 1915+105

We present near infrared spectroscopy of the super-luminal microquasar GRS 1915+105 obtained with the first unit of the VLT1 and the ISAAC spectro-imager. The emission features detected in the VLT data have been identified as He I, Br γ, He II and Na I. The detection of Na I is reported here for the...

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Guardado en:
Detalles Bibliográficos
Publicado: 2000
Materias:
Infrared: stars
Radio continuum: stars
Stars: individual: GRS 1915+105
X-rays: stars
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v356_n3_p943_Marti
http://hdl.handle.net/20.500.12110/paper_00046361_v356_n3_p943_Marti
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00046361_v356_n3_p943_Marti
record_format dspace
spelling paper:paper_00046361_v356_n3_p943_Marti2023-06-08T14:27:24Z VLT observations of GRS 1915+105 Infrared: stars Radio continuum: stars Stars: individual: GRS 1915+105 X-rays: stars We present near infrared spectroscopy of the super-luminal microquasar GRS 1915+105 obtained with the first unit of the VLT1 and the ISAAC spectro-imager. The emission features detected in the VLT data have been identified as He I, Br γ, He II and Na I. The detection of Na I is reported here for the first time, while our confirmation of weak He II emission provides support to previous marginal detections of this feature. By comparing the observed spectra with those of massive stars, we find that our results are very consistent with GRS 1915+105 being a high mass X-ray system with an early type primary, as previously proposed by Chaty et al. (1996) and Mirabel et al. (1997). The VLT spectra also provide evidence of P Cygni profiles, that turn into blue emission wings when the system is in outburst. This observed line profile evolution implies that GRS 1915+105 must be surrounded by an expanding envelope, that is partially blown out during the X-ray outbursts. The presence of such circumstellar gaseous material around GRS 1915+105 is more naturally understood in the context of a massive luminous star than if the system was a low-mass X-ray binary. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v356_n3_p943_Marti http://hdl.handle.net/20.500.12110/paper_00046361_v356_n3_p943_Marti
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Infrared: stars
Radio continuum: stars
Stars: individual: GRS 1915+105
X-rays: stars
spellingShingle Infrared: stars
Radio continuum: stars
Stars: individual: GRS 1915+105
X-rays: stars
VLT observations of GRS 1915+105
topic_facet Infrared: stars
Radio continuum: stars
Stars: individual: GRS 1915+105
X-rays: stars
description We present near infrared spectroscopy of the super-luminal microquasar GRS 1915+105 obtained with the first unit of the VLT1 and the ISAAC spectro-imager. The emission features detected in the VLT data have been identified as He I, Br γ, He II and Na I. The detection of Na I is reported here for the first time, while our confirmation of weak He II emission provides support to previous marginal detections of this feature. By comparing the observed spectra with those of massive stars, we find that our results are very consistent with GRS 1915+105 being a high mass X-ray system with an early type primary, as previously proposed by Chaty et al. (1996) and Mirabel et al. (1997). The VLT spectra also provide evidence of P Cygni profiles, that turn into blue emission wings when the system is in outburst. This observed line profile evolution implies that GRS 1915+105 must be surrounded by an expanding envelope, that is partially blown out during the X-ray outbursts. The presence of such circumstellar gaseous material around GRS 1915+105 is more naturally understood in the context of a massive luminous star than if the system was a low-mass X-ray binary.
title VLT observations of GRS 1915+105
title_short VLT observations of GRS 1915+105
title_full VLT observations of GRS 1915+105
title_fullStr VLT observations of GRS 1915+105
title_full_unstemmed VLT observations of GRS 1915+105
title_sort vlt observations of grs 1915+105
publishDate 2000
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v356_n3_p943_Marti
http://hdl.handle.net/20.500.12110/paper_00046361_v356_n3_p943_Marti
_version_ 1768546470402719744

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