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

Autores
Aidelman, Yael Judith; Cidale, Lydia Sonia
Año de publicación
2023
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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
Materia
Ciencias Astronómicas
stars: early-type
stars: emission-line, Be
(stars:) circumstellar matter
Stars: peculiar (except chemically peculiar)
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/152352

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repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Reddening-free Q parameters to classify B-Type Stars with emission linesAidelman, Yael JudithCidale, Lydia SoniaCiencias Astronómicasstars: early-typestars: emission-line, Be(stars:) circumstellar matterStars: 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 Plata2023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/152352enginfo:eu-repo/semantics/altIdentifier/issn/2075-4434info:eu-repo/semantics/altIdentifier/doi/10.3390/galaxies11010031info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:39:17Zoai:sedici.unlp.edu.ar:10915/152352Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:39:17.752SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Reddening-free Q parameters to classify B-Type Stars with emission lines
title Reddening-free Q parameters to classify B-Type Stars with emission lines
spellingShingle Reddening-free Q parameters to classify B-Type Stars with emission lines
Aidelman, Yael Judith
Ciencias Astronómicas
stars: early-type
stars: emission-line, Be
(stars:) circumstellar matter
Stars: peculiar (except chemically peculiar)
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
dc.creator.none.fl_str_mv Aidelman, Yael Judith
Cidale, Lydia Sonia
author Aidelman, Yael Judith
author_facet Aidelman, Yael Judith
Cidale, Lydia Sonia
author_role author
author2 Cidale, Lydia Sonia
author2_role author
dc.subject.none.fl_str_mv Ciencias Astronómicas
stars: early-type
stars: emission-line, Be
(stars:) circumstellar matter
Stars: peculiar (except chemically peculiar)
topic Ciencias Astronómicas
stars: early-type
stars: emission-line, Be
(stars:) circumstellar matter
Stars: peculiar (except chemically peculiar)
dc.description.none.fl_txt_mv 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
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.
publishDate 2023
dc.date.none.fl_str_mv 2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/152352
url http://sedici.unlp.edu.ar/handle/10915/152352
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/2075-4434
info:eu-repo/semantics/altIdentifier/doi/10.3390/galaxies11010031
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
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