Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula

We present and discuss broad band CCD UBV(I)c photometry and low resolution spectroscopy for stars in the region of the open cluster NGC 6996, located in the North America Nebula. The new data allow us to tightly constrain the basic properties of this object. We revise the cluster size, which in the...

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Detalles Bibliográficos
Autores principales: Villanova, S., Baume, Gustavo, Carraro, G., Geminale, A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Ciencias Astronómicas
Galaxy: Open clusters and associations: general
Galaxy: open clusters and associations: individual NGC 6996
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83258
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83258
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxy: Open clusters and associations: general
Galaxy: open clusters and associations: individual NGC 6996
spellingShingle Ciencias Astronómicas
Galaxy: Open clusters and associations: general
Galaxy: open clusters and associations: individual NGC 6996
Villanova, S.
Baume, Gustavo
Carraro, G.
Geminale, A.
Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula
topic_facet Ciencias Astronómicas
Galaxy: Open clusters and associations: general
Galaxy: open clusters and associations: individual NGC 6996
description We present and discuss broad band CCD UBV(I)c photometry and low resolution spectroscopy for stars in the region of the open cluster NGC 6996, located in the North America Nebula. The new data allow us to tightly constrain the basic properties of this object. We revise the cluster size, which in the past has been significantly underestimated. The width of the Main Sequence is mainly interpreted in terms of differential reddening, and indeed the stars' color excess EB-V ranges from 0.43 to 0.65, implying the presence of a significant and evenly distributed dust component. We cross-correlate our optical photometry with near infrared photometry from 2MASS, and by means of spectral classification we are able to build extinction curves for an handful of bright members. We find that the reddening slope and the total to selective absorption ratio Rv toward NGC 6996 are anomalous. Moreover the reddening-corrected colors and magnitudes allow us to derive estimates for the cluster distance and age, which turn out to be 760 ± 70 pc (V0 - Mv = 9.4 ± 0.2) and ∼350 Myr, respectively. Based on our results, we suggest that NGC 6996 is located in front of the North America Nebula, and does not seem to have any apparent relationship with it.
format Articulo
Articulo
author Villanova, S.
Baume, Gustavo
Carraro, G.
Geminale, A.
author_facet Villanova, S.
Baume, Gustavo
Carraro, G.
Geminale, A.
author_sort Villanova, S.
title Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula
title_short Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula
title_full Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula
title_fullStr Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula
title_full_unstemmed Optical photometry and spectral classification in the field of the open cluster NGC 6996 in the North America Nebula
title_sort optical photometry and spectral classification in the field of the open cluster ngc 6996 in the north america nebula
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/83258
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AT carrarog opticalphotometryandspectralclassificationinthefieldoftheopenclusterngc6996inthenorthamericanebula
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