A study of the dark patches NGC 2209

The globular cluster NGC 2209, belonging to the LMC, shows a striking "hole" in which there are no stars, as well as some other less evident structures. Roberts (1960), Kanagy and Wiatt (1978) concluded that it is very unlikely that such "holes" are caused by statistical fluctuat...

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Detalles Bibliográficos
Autores principales: Ostrov, Pablo Gabriel, Forte, Juan Carlos
Formato: Articulo Comunicacion
Lenguaje:Español
Publicado: 1993
Materias:
Astronomía
Galaxia
ngc 2209
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/148431
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-148431
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Astronomía
Galaxia
ngc 2209
spellingShingle Astronomía
Galaxia
ngc 2209
Ostrov, Pablo Gabriel
Forte, Juan Carlos
A study of the dark patches NGC 2209
topic_facet Astronomía
Galaxia
ngc 2209
description The globular cluster NGC 2209, belonging to the LMC, shows a striking "hole" in which there are no stars, as well as some other less evident structures. Roberts (1960), Kanagy and Wiatt (1978) concluded that it is very unlikely that such "holes" are caused by statistical fluctuations in the distribution of bright stars. Dottori, Melnick and Bica (1987) carried out a CCD photometry in the B,V and I bands, determining that stars superimposed with the patch are unreddened. Our photometry confirms this result, suggesting that the patches are originated by a cloud of dark matter in the interior of the cluster. In Fig.l, are shown the positions of two stars in the most evident hole. Fig. 2, shows the positions of these stars in the Tᵢ vs (C - Tᵢ) diagram. The observations were carried out with the 1.5 m telescope at the CTIO. CCD frames of NGC 2209 were obtained in the C,M, and T₁ bands of the Washington' s photometry System. The photometry was carried out using DAOPHOT. In order to avoid large errors in the sky value determination in more crowded regions toward the center of the cluster, a model of the sky brightness due to unsolved stars was constructed.
format Articulo
Comunicacion
author Ostrov, Pablo Gabriel
Forte, Juan Carlos
author_facet Ostrov, Pablo Gabriel
Forte, Juan Carlos
author_sort Ostrov, Pablo Gabriel
title A study of the dark patches NGC 2209
title_short A study of the dark patches NGC 2209
title_full A study of the dark patches NGC 2209
title_fullStr A study of the dark patches NGC 2209
title_full_unstemmed A study of the dark patches NGC 2209
title_sort study of the dark patches ngc 2209
publishDate 1993
url http://sedici.unlp.edu.ar/handle/10915/148431
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