Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/99093 |
Resumo: | 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 RCW79 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. |
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Chené, André-NicolasBorissova, JuraClarke, J. R. A.Bonatto, Charles JoseMajaess, Daniel J.Moni Bidin, ChristianSale, Stuart E.Mauro, FrancescoKurtev, Radostin GeorgievBaume, Gustavo LuisFeinstein Baigorri, CarlosIvanov, Valentin D.Geisler, DougCatelan, MárcioMinniti, DanteLucas, Philip W.Grijs, Richard deKumar, M. S. N.2014-08-05T02:07:37Z20120004-6361http://hdl.handle.net/10183/99093000901295Context. 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 RCW79 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.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 545 (Sep. 2012), A54, 18 p.Aglomerados estelaresEstrelas variaveisFotometria estelarEvolucao estelarEspectros infravermelhosGalaxiaAstronomia infravermelhaOpen clusters and associations: generalInfrared: starsSurveysMassive open star clusters using the VVV survey : I. Presentation of the data and description of the approachEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000901295.pdf000901295.pdfTexto completo (inglês)application/pdf6012315http://www.lume.ufrgs.br/bitstream/10183/99093/1/000901295.pdffb5f2eece5cfea64c723c0fbe2d41703MD51TEXT000901295.pdf.txt000901295.pdf.txtExtracted Texttext/plain91264http://www.lume.ufrgs.br/bitstream/10183/99093/2/000901295.pdf.txt598ab522c2dd7a8de6428a4990e74e00MD52THUMBNAIL000901295.pdf.jpg000901295.pdf.jpgGenerated Thumbnailimage/jpeg2121http://www.lume.ufrgs.br/bitstream/10183/99093/3/000901295.pdf.jpg3a9db13cf8e1d830668e6ba68c7669c3MD5310183/990932023-07-15 03:27:54.710166oai:www.lume.ufrgs.br:10183/99093Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-15T06:27:54Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.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, André-Nicolas Aglomerados estelares Estrelas variaveis Fotometria estelar Evolucao estelar Espectros infravermelhos Galaxia Astronomia infravermelha Open clusters and associations: general Infrared: stars 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 |
author |
Chené, André-Nicolas |
author_facet |
Chené, André-Nicolas Borissova, Jura Clarke, J. R. A. Bonatto, Charles Jose Majaess, Daniel J. Moni Bidin, Christian Sale, Stuart E. Mauro, Francesco Kurtev, Radostin Georgiev Baume, Gustavo Luis Feinstein Baigorri, Carlos Ivanov, Valentin D. Geisler, Doug Catelan, Márcio Minniti, Dante Lucas, Philip W. Grijs, Richard de Kumar, M. S. N. |
author_role |
author |
author2 |
Borissova, Jura Clarke, J. R. A. Bonatto, Charles Jose Majaess, Daniel J. Moni Bidin, Christian Sale, Stuart E. Mauro, Francesco Kurtev, Radostin Georgiev Baume, Gustavo Luis Feinstein Baigorri, Carlos Ivanov, Valentin D. Geisler, Doug Catelan, Márcio Minniti, Dante Lucas, Philip W. Grijs, Richard de Kumar, M. S. N. |
author2_role |
author author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Chené, André-Nicolas Borissova, Jura Clarke, J. R. A. Bonatto, Charles Jose Majaess, Daniel J. Moni Bidin, Christian Sale, Stuart E. Mauro, Francesco Kurtev, Radostin Georgiev Baume, Gustavo Luis Feinstein Baigorri, Carlos Ivanov, Valentin D. Geisler, Doug Catelan, Márcio Minniti, Dante Lucas, Philip W. Grijs, Richard de Kumar, M. S. N. |
dc.subject.por.fl_str_mv |
Aglomerados estelares Estrelas variaveis Fotometria estelar Evolucao estelar Espectros infravermelhos Galaxia Astronomia infravermelha |
topic |
Aglomerados estelares Estrelas variaveis Fotometria estelar Evolucao estelar Espectros infravermelhos Galaxia Astronomia infravermelha Open clusters and associations: general Infrared: stars Surveys |
dc.subject.eng.fl_str_mv |
Open clusters and associations: general Infrared: stars Surveys |
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 RCW79 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.issued.fl_str_mv |
2012 |
dc.date.accessioned.fl_str_mv |
2014-08-05T02:07:37Z |
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000901295 |
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Astronomy and astrophysics. Les Ulis. Vol. 545 (Sep. 2012), A54, 18 p. |
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