Modeling of molecules in circumstellar media

B[e] stars are characterized by having spectral lines in emission, both of forbiden and allowed transitions, produced in the disk that surrounds the star. The temperature and density conditions in these disks allow the formation of molecules, whose presence is manifested in the observation of molecu...

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Autores principales:	Vallverdú, Rodolfo Enrique, Kraus, M., Torres, Andrea Fabiana, Arias, María Laura
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2021
Materias:	Ciencias Astronómicas stars: emission-line, Be circumstellar matter molecules
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/167215
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-167215
record_format	dspace
spelling	I19-R120-10915-1672152024-06-13T20:02:41Z http://sedici.unlp.edu.ar/handle/10915/167215 Modeling of molecules in circumstellar media Vallverdú, Rodolfo Enrique Kraus, M. Torres, Andrea Fabiana Arias, María Laura 2021 2024-06-13T14:51:41Z en Ciencias Astronómicas stars: emission-line, Be circumstellar matter molecules B[e] stars are characterized by having spectral lines in emission, both of forbiden and allowed transitions, produced in the disk that surrounds the star. The temperature and density conditions in these disks allow the formation of molecules, whose presence is manifested in the observation of molecular bands in emission. In this work we present the code that we have developed which allows us to model the emission bands of different diatomic molecules, such as CO, SiO, CS, SiS, NH, etc. The program takes into account the different isotopes that make up the molecules, since these significantly affect the bands. With this program we can obtain the combined spectra of molecules composed of different isotopes and the superposition of different molecules. Comparing with the observations, we can use these theoretical spectra not only to determine the presence of the molecules, but also other parameters, such as the temperature and density of the regions of formation of the molecules in the disk, the velocity of rotation, and the region of the disk where the molecules are found. We can also use them to determine the abundance ratio of the different isotopes of a molecule, which can be used to determine the evolutionary stage of the star. Las estrellas B[e] se caracterizan por poseer líneas espectrales en emisión, tanto de transiciones prohibidas como permitidas, producidas en el disco que rodea a la estrella. Las condiciones de temperatura y densidad en estos discos permiten la formación de moléculas, cuya presencia se manifiesta en la observación de bandas moleculares en emisión. En este trabajo presentamos el código que hemos desarrollado que nos permite modelar las bandas en emisión de distintas moléculas diatómicas como CO, SiO, CS, SiS, NH, etc. El programa tiene en cuenta los distintos isótopos que componen las moléculas, ya que éstos afectan significativamente a las bandas. Con este programa podemos obtener los espectros combinados tanto de moléculas compuestas por distintos isótopos como de la superposición de distintas moléculas. Comparando con las observaciones, podemos usar estos espectros teóricos no sólo para determinar la presencia de las moléculas, sino también otros parámetros, como la temperatura y densidad de las regiones de formación de las moléculas en el disco, la velocidad de rotación, y la región del disco en donde se encuentran las moléculas. Además los podemos utilizar para determinar la relación de abundancia de los distintos isótopos de una molécula, que puede ser utilizada para determinar la etapa evolutiva de la estrella. Asociación Argentina de Astronomía 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 101-103
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 circumstellar matter molecules
spellingShingle	Ciencias Astronómicas stars: emission-line, Be circumstellar matter molecules Vallverdú, Rodolfo Enrique Kraus, M. Torres, Andrea Fabiana Arias, María Laura Modeling of molecules in circumstellar media
topic_facet	Ciencias Astronómicas stars: emission-line, Be circumstellar matter molecules
description	B[e] stars are characterized by having spectral lines in emission, both of forbiden and allowed transitions, produced in the disk that surrounds the star. The temperature and density conditions in these disks allow the formation of molecules, whose presence is manifested in the observation of molecular bands in emission. In this work we present the code that we have developed which allows us to model the emission bands of different diatomic molecules, such as CO, SiO, CS, SiS, NH, etc. The program takes into account the different isotopes that make up the molecules, since these significantly affect the bands. With this program we can obtain the combined spectra of molecules composed of different isotopes and the superposition of different molecules. Comparing with the observations, we can use these theoretical spectra not only to determine the presence of the molecules, but also other parameters, such as the temperature and density of the regions of formation of the molecules in the disk, the velocity of rotation, and the region of the disk where the molecules are found. We can also use them to determine the abundance ratio of the different isotopes of a molecule, which can be used to determine the evolutionary stage of the star.
format	Articulo Articulo
author	Vallverdú, Rodolfo Enrique Kraus, M. Torres, Andrea Fabiana Arias, María Laura
author_facet	Vallverdú, Rodolfo Enrique Kraus, M. Torres, Andrea Fabiana Arias, María Laura
author_sort	Vallverdú, Rodolfo Enrique
title	Modeling of molecules in circumstellar media
title_short	Modeling of molecules in circumstellar media
title_full	Modeling of molecules in circumstellar media
title_fullStr	Modeling of molecules in circumstellar media
title_full_unstemmed	Modeling of molecules in circumstellar media
title_sort	modeling of molecules in circumstellar media
publishDate	2021
url	http://sedici.unlp.edu.ar/handle/10915/167215
work_keys_str_mv	AT vallverdurodolfoenrique modelingofmoleculesincircumstellarmedia AT krausm modelingofmoleculesincircumstellarmedia AT torresandreafabiana modelingofmoleculesincircumstellarmedia AT ariasmarialaura modelingofmoleculesincircumstellarmedia
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Modeling of molecules in circumstellar media

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