Reddening-free Q parameters to classify B-Type Stars with emission lines

The emission-line B-type stars constitute a heterogeneous group. Many of these stars show similar optical spectroscopic features and color indices, making it difficult to classify them adequately by means of photometric and spectroscopic techniques. Thus, it is relevant to deal with appropriate clas...

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Autores principales: Aidelman, Yael Judith, Cidale, Lydia Sonia
Formato: Articulo
Lenguaje:Inglés
Publicado: 2023
Materias:
Ciencias Astronómicas
stars: early-type
stars: emission-line, Be
(stars:) circumstellar matter
Stars: peculiar (except chemically peculiar)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/152352
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-152352
record_format dspace
spelling I19-R120-10915-1523522023-05-02T20:04:26Z http://sedici.unlp.edu.ar/handle/10915/152352 issn:2075-4434 Reddening-free Q parameters to classify B-Type Stars with emission lines Aidelman, Yael Judith Cidale, Lydia Sonia 2023 2023-05-02T18:05:57Z en Ciencias Astronómicas stars: early-type stars: emission-line, Be (stars:) circumstellar matter Stars: peculiar (except chemically peculiar) The emission-line B-type stars constitute a heterogeneous group. Many of these stars show similar optical spectroscopic features and color indices, making it difficult to classify them adequately by means of photometric and spectroscopic techniques. Thus, it is relevant to deal with appropriate classification criteria to avoid as many selection effects as possible. For this purpose, we analyzed different reddening-free Q parameters, taking advantage of the Gaia and 2MASS photometric surveys, for both main sequence and emission-line B-type stars. Along with this work, we provided various criteria to search for normal and emission-line B-type stars, using different color–color, Q–color, and Q–Q diagrams. It was also possible to identify stars in different transition phases (i.e., (Rp - J) vs. (J - Ks) diagrams) and to classify them according to their NIR radiation excesses (i.e., the (Bp - Rp) vs. (H - Ks) diagram). Other diagrams, such as the QJKHK vs. (H - Ks) or QBpJHK vs. (Bp - Ks), were very useful to search for and classify different classes of B-type stars with emission lines. These diagrams highlighted the presence of several stars, classified as CBe, with large color excesses that seemed to be caused by the presence of dust in their envelopes. Therefore, these stars would be misclassified. Three groups of HAeBe stars with different intrinsic dust properties were also distinguished. The amount of intrinsic dust emission in the diverse groups of emission-line stars was well-recognized via the QJHK vs. QBpRpHK diagram. The different selection criteria are very important tools for automated designs of machine learning and optimal search algorithms. Instituto de Astrofísica de La Plata Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 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: early-type
stars: emission-line, Be
(stars:) circumstellar matter
Stars: peculiar (except chemically peculiar)
spellingShingle Ciencias Astronómicas
stars: early-type
stars: emission-line, Be
(stars:) circumstellar matter
Stars: peculiar (except chemically peculiar)
Aidelman, Yael Judith
Cidale, Lydia Sonia
Reddening-free Q parameters to classify B-Type Stars with emission lines
topic_facet Ciencias Astronómicas
stars: early-type
stars: emission-line, Be
(stars:) circumstellar matter
Stars: peculiar (except chemically peculiar)
description The emission-line B-type stars constitute a heterogeneous group. Many of these stars show similar optical spectroscopic features and color indices, making it difficult to classify them adequately by means of photometric and spectroscopic techniques. Thus, it is relevant to deal with appropriate classification criteria to avoid as many selection effects as possible. For this purpose, we analyzed different reddening-free Q parameters, taking advantage of the Gaia and 2MASS photometric surveys, for both main sequence and emission-line B-type stars. Along with this work, we provided various criteria to search for normal and emission-line B-type stars, using different color–color, Q–color, and Q–Q diagrams. It was also possible to identify stars in different transition phases (i.e., (Rp - J) vs. (J - Ks) diagrams) and to classify them according to their NIR radiation excesses (i.e., the (Bp - Rp) vs. (H - Ks) diagram). Other diagrams, such as the QJKHK vs. (H - Ks) or QBpJHK vs. (Bp - Ks), were very useful to search for and classify different classes of B-type stars with emission lines. These diagrams highlighted the presence of several stars, classified as CBe, with large color excesses that seemed to be caused by the presence of dust in their envelopes. Therefore, these stars would be misclassified. Three groups of HAeBe stars with different intrinsic dust properties were also distinguished. The amount of intrinsic dust emission in the diverse groups of emission-line stars was well-recognized via the QJHK vs. QBpRpHK diagram. The different selection criteria are very important tools for automated designs of machine learning and optimal search algorithms.
format Articulo
Articulo
author Aidelman, Yael Judith
Cidale, Lydia Sonia
author_facet Aidelman, Yael Judith
Cidale, Lydia Sonia
author_sort Aidelman, Yael Judith
title Reddening-free Q parameters to classify B-Type Stars with emission lines
title_short Reddening-free Q parameters to classify B-Type Stars with emission lines
title_full Reddening-free Q parameters to classify B-Type Stars with emission lines
title_fullStr Reddening-free Q parameters to classify B-Type Stars with emission lines
title_full_unstemmed Reddening-free Q parameters to classify B-Type Stars with emission lines
title_sort reddening-free q parameters to classify b-type stars with emission lines
publishDate 2023
url http://sedici.unlp.edu.ar/handle/10915/152352
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AT cidalelydiasonia reddeningfreeqparameterstoclassifybtypestarswithemissionlines
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