Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach

Autores
Chené, A. N.; Borissova, J.; Clarke, J. R.A.; Bonatto, C.; Majaess, D. J.; Moni Bidin, C.; Sale, S. E.; Mauro, F.; Kurtev, R.; Baume, Gustavo Luis; Feinstein Baigorri, Carlos; Ivanov, V. D.; Geisler, D.; Catelan, M.; Minniti, D.; Lucas, P.; De Grijs, R.; Kumar, M. S. N.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
reseña artículo
Estado
versión publicada
Descripción
Context. The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Aims. The VVV observations will foster the construction of a sample of Galactic star clusters with reliable and homogeneously derived physical parameters (e.g., age, distance, and mass, etc.). In this first paper in a series, the methodology employed to establish cluster parameters for the envisioned database are elaborated upon by analysing four known young open clusters: Danks 1, Danks 2, RCW 79, and DBS 132. The analysis offers a first glimpse of the information that can be gleaned from the VVV observations for clusters in the final database. Methods. Wide-field, deep JHKs VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters. Results. Results are inferred from VVV near-infrared photometry and numerous low resolution spectra (typically more than 10 per cluster). The high quality of the spectra and the deep wide-field VVV photometry enables us to precisely and independently determine the characteristics of the clusters studied, which we compare to previous determinations. An anomalous reddening law in the direction of the Danks clusters is found, specifically E(J - H)/E(H - Ks) = 2.20 ± 0.06, which exceeds published values for the inner Galaxy. The G305 star forming complex, which includes the Danks clusters, lies beyond the Sagittarius-Carina spiral arm and occupies the Centaurus arm. Finally, the first deep infrared colour-magnitude diagram of RCW 79 is presented, which reveals a sizeable pre-main sequence population. A list of candidate variable stars in G305 region is reported. Conclusions. This study demonstrates the strength of the dataset and methodology employed, and constitutes the first step of a broader study which shall include reliable parameters for a sizeable number of poorly characterised and/or newly discovered clusters.
Instituto de Astrofísica de La Plata
Materia
Ciencias Astronómicas
Infrared: stars
Open clusters and associations: general
Surveys
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/84566

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oai_identifier_str oai:sedici.unlp.edu.ar:10915/84566
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approachChené, A. N.Borissova, J.Clarke, J. R.A.Bonatto, C.Majaess, D. J.Moni Bidin, C.Sale, S. E.Mauro, F.Kurtev, R.Baume, Gustavo LuisFeinstein Baigorri, CarlosIvanov, V. D.Geisler, D.Catelan, M.Minniti, D.Lucas, P.De Grijs, R.Kumar, M. S. N.Ciencias AstronómicasInfrared: starsOpen clusters and associations: generalSurveysContext. The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Aims. The VVV observations will foster the construction of a sample of Galactic star clusters with reliable and homogeneously derived physical parameters (e.g., age, distance, and mass, etc.). In this first paper in a series, the methodology employed to establish cluster parameters for the envisioned database are elaborated upon by analysing four known young open clusters: Danks 1, Danks 2, RCW 79, and DBS 132. The analysis offers a first glimpse of the information that can be gleaned from the VVV observations for clusters in the final database. Methods. Wide-field, deep JHKs VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters. Results. Results are inferred from VVV near-infrared photometry and numerous low resolution spectra (typically more than 10 per cluster). The high quality of the spectra and the deep wide-field VVV photometry enables us to precisely and independently determine the characteristics of the clusters studied, which we compare to previous determinations. An anomalous reddening law in the direction of the Danks clusters is found, specifically E(J - H)/E(H - Ks) = 2.20 ± 0.06, which exceeds published values for the inner Galaxy. The G305 star forming complex, which includes the Danks clusters, lies beyond the Sagittarius-Carina spiral arm and occupies the Centaurus arm. Finally, the first deep infrared colour-magnitude diagram of RCW 79 is presented, which reveals a sizeable pre-main sequence population. A list of candidate variable stars in G305 region is reported. Conclusions. This study demonstrates the strength of the dataset and methodology employed, and constitutes the first step of a broader study which shall include reliable parameters for a sizeable number of poorly characterised and/or newly discovered clusters.Instituto de Astrofísica de La Plata2012info:eu-repo/semantics/reviewinfo:eu-repo/semantics/publishedVersionRevisionhttp://purl.org/coar/resource_type/c_dcae04bcinfo:ar-repo/semantics/resenaArticuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/84566enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201219064info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:01Zoai:sedici.unlp.edu.ar:10915/84566Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:01.538SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach
title Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach
spellingShingle Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach
Chené, A. N.
Ciencias Astronómicas
Infrared: stars
Open clusters and associations: general
Surveys
title_short Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach
title_full Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach
title_fullStr Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach
title_full_unstemmed Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach
title_sort Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach
dc.creator.none.fl_str_mv Chené, A. N.
Borissova, J.
Clarke, J. R.A.
Bonatto, C.
Majaess, D. J.
Moni Bidin, C.
Sale, S. E.
Mauro, F.
Kurtev, R.
Baume, Gustavo Luis
Feinstein Baigorri, Carlos
Ivanov, V. D.
Geisler, D.
Catelan, M.
Minniti, D.
Lucas, P.
De Grijs, R.
Kumar, M. S. N.
author Chené, A. N.
author_facet Chené, A. N.
Borissova, J.
Clarke, J. R.A.
Bonatto, C.
Majaess, D. J.
Moni Bidin, C.
Sale, S. E.
Mauro, F.
Kurtev, R.
Baume, Gustavo Luis
Feinstein Baigorri, Carlos
Ivanov, V. D.
Geisler, D.
Catelan, M.
Minniti, D.
Lucas, P.
De Grijs, R.
Kumar, M. S. N.
author_role author
author2 Borissova, J.
Clarke, J. R.A.
Bonatto, C.
Majaess, D. J.
Moni Bidin, C.
Sale, S. E.
Mauro, F.
Kurtev, R.
Baume, Gustavo Luis
Feinstein Baigorri, Carlos
Ivanov, V. D.
Geisler, D.
Catelan, M.
Minniti, D.
Lucas, P.
De Grijs, R.
Kumar, M. S. N.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Infrared: stars
Open clusters and associations: general
Surveys
topic Ciencias Astronómicas
Infrared: stars
Open clusters and associations: general
Surveys
dc.description.none.fl_txt_mv Context. The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Aims. The VVV observations will foster the construction of a sample of Galactic star clusters with reliable and homogeneously derived physical parameters (e.g., age, distance, and mass, etc.). In this first paper in a series, the methodology employed to establish cluster parameters for the envisioned database are elaborated upon by analysing four known young open clusters: Danks 1, Danks 2, RCW 79, and DBS 132. The analysis offers a first glimpse of the information that can be gleaned from the VVV observations for clusters in the final database. Methods. Wide-field, deep JHKs VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters. Results. Results are inferred from VVV near-infrared photometry and numerous low resolution spectra (typically more than 10 per cluster). The high quality of the spectra and the deep wide-field VVV photometry enables us to precisely and independently determine the characteristics of the clusters studied, which we compare to previous determinations. An anomalous reddening law in the direction of the Danks clusters is found, specifically E(J - H)/E(H - Ks) = 2.20 ± 0.06, which exceeds published values for the inner Galaxy. The G305 star forming complex, which includes the Danks clusters, lies beyond the Sagittarius-Carina spiral arm and occupies the Centaurus arm. Finally, the first deep infrared colour-magnitude diagram of RCW 79 is presented, which reveals a sizeable pre-main sequence population. A list of candidate variable stars in G305 region is reported. Conclusions. This study demonstrates the strength of the dataset and methodology employed, and constitutes the first step of a broader study which shall include reliable parameters for a sizeable number of poorly characterised and/or newly discovered clusters.
Instituto de Astrofísica de La Plata
description Context. The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Aims. The VVV observations will foster the construction of a sample of Galactic star clusters with reliable and homogeneously derived physical parameters (e.g., age, distance, and mass, etc.). In this first paper in a series, the methodology employed to establish cluster parameters for the envisioned database are elaborated upon by analysing four known young open clusters: Danks 1, Danks 2, RCW 79, and DBS 132. The analysis offers a first glimpse of the information that can be gleaned from the VVV observations for clusters in the final database. Methods. Wide-field, deep JHKs VVV observations, combined with new infrared spectroscopy, are employed to constrain fundamental parameters for a subset of clusters. Results. Results are inferred from VVV near-infrared photometry and numerous low resolution spectra (typically more than 10 per cluster). The high quality of the spectra and the deep wide-field VVV photometry enables us to precisely and independently determine the characteristics of the clusters studied, which we compare to previous determinations. An anomalous reddening law in the direction of the Danks clusters is found, specifically E(J - H)/E(H - Ks) = 2.20 ± 0.06, which exceeds published values for the inner Galaxy. The G305 star forming complex, which includes the Danks clusters, lies beyond the Sagittarius-Carina spiral arm and occupies the Centaurus arm. Finally, the first deep infrared colour-magnitude diagram of RCW 79 is presented, which reveals a sizeable pre-main sequence population. A list of candidate variable stars in G305 region is reported. Conclusions. This study demonstrates the strength of the dataset and methodology employed, and constitutes the first step of a broader study which shall include reliable parameters for a sizeable number of poorly characterised and/or newly discovered clusters.
publishDate 2012
dc.date.none.fl_str_mv 2012
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