New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy

The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer p...

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Autores principales:	Torres, Andrea Fabiana, Arias, María Laura, Kraus, Michaela, Mercanti, Lorena Verónica, Eenmäe, Tõnis
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2023
Materias:	Ciencias Astronómicas stars: emission-line, Be stars: peculiar stars: individual: MWC 645 circumstellar matter binaries: general techniques: spectroscopic
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/159964
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-159964
record_format	dspace
spelling	I19-R120-10915-1599642023-11-08T20:04:02Z http://sedici.unlp.edu.ar/handle/10915/159964 New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy Torres, Andrea Fabiana Arias, María Laura Kraus, Michaela Mercanti, Lorena Verónica Eenmäe, Tõnis 2023 2023-11-08T18:43:45Z en Ciencias Astronómicas stars: emission-line, Be stars: peculiar stars: individual: MWC 645 circumstellar matter binaries: general techniques: spectroscopic The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios. Instituto de Astrofísica de La Plata Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas stars: emission-line, Be stars: peculiar stars: individual: MWC 645 circumstellar matter binaries: general techniques: spectroscopic
spellingShingle	Ciencias Astronómicas stars: emission-line, Be stars: peculiar stars: individual: MWC 645 circumstellar matter binaries: general techniques: spectroscopic Torres, Andrea Fabiana Arias, María Laura Kraus, Michaela Mercanti, Lorena Verónica Eenmäe, Tõnis New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
topic_facet	Ciencias Astronómicas stars: emission-line, Be stars: peculiar stars: individual: MWC 645 circumstellar matter binaries: general techniques: spectroscopic
description	The B[e] phenomenon is manifested by a heterogeneous group of stars surrounded by gaseous and dusty circumstellar envelopes with similar physical conditions. Among these stars, the FS CMa-type objects are suspected to be binary systems, which could be experiencing or have undergone a mass-transfer process that could explain the large amount of material surrounding them. We aim to contribute to the knowledge of a recently confirmed binary, MWC645, which could be undergoing an active mass-transfer process. We present near-infrared and optical spectra, identify atomic and molecular spectral features, and derive different quantitative properties of line profiles. Based on publicly available photometric data, we search for periodicity in the light curve and model the spectral energy distribution. We have detected molecular bands of CO in absorption at 1.62 m and 2.3 m for the first time. We derive an upper limit for the effective temperature of the cool binary component. We found a correlation between the enhancement of the Ha emission and the decrease in optical brightness that could be associated with mass-ejection events or an increase in mass loss. We outline the global properties of the envelope, possibly responsible for brightness variations due to a variable extinction, and briefly speculate on different possible scenarios.
format	Articulo Articulo
author	Torres, Andrea Fabiana Arias, María Laura Kraus, Michaela Mercanti, Lorena Verónica Eenmäe, Tõnis
author_facet	Torres, Andrea Fabiana Arias, María Laura Kraus, Michaela Mercanti, Lorena Verónica Eenmäe, Tõnis
author_sort	Torres, Andrea Fabiana
title	New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title_short	New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title_full	New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title_fullStr	New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title_full_unstemmed	New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy
title_sort	new insight into the fs cma system mwc 645 from near-infrared and optical spectroscopy
publishDate	2023
url	http://sedici.unlp.edu.ar/handle/10915/159964
work_keys_str_mv	AT torresandreafabiana newinsightintothefscmasystemmwc645fromnearinfraredandopticalspectroscopy AT ariasmarialaura newinsightintothefscmasystemmwc645fromnearinfraredandopticalspectroscopy AT krausmichaela newinsightintothefscmasystemmwc645fromnearinfraredandopticalspectroscopy AT mercantilorenaveronica newinsightintothefscmasystemmwc645fromnearinfraredandopticalspectroscopy AT eenmaetonis newinsightintothefscmasystemmwc645fromnearinfraredandopticalspectroscopy
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New insight into the FS CMa system MWC 645 from near-infrared and optical spectroscopy

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