CCD photometry in the region of NGC 6994: the remains of an old open cluster

We present the results of BV(RI)<sub>KC</sub> CCD photometry down to V=21 mag in the region of NGC 6994. To our knowledge, no photometry has previously been reported for this object and we find evidences that it is a poor and sparse old open cluster, with a minimum angular diameter of 9...

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Autores principales: Bassino, Lilia Patricia, Waldhausen, Silvia, Martínez, Rubén Enrique
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Astronomía
open clusters and associations: general
open clusters and associations: individual: NGC 6994
techniques: photometric
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/93554
https://ri.conicet.gov.ar/handle/11336/37078
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-93554
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
open clusters and associations: general
open clusters and associations: individual: NGC 6994
techniques: photometric
spellingShingle Astronomía
open clusters and associations: general
open clusters and associations: individual: NGC 6994
techniques: photometric
Bassino, Lilia Patricia
Waldhausen, Silvia
Martínez, Rubén Enrique
CCD photometry in the region of NGC 6994: the remains of an old open cluster
topic_facet Astronomía
open clusters and associations: general
open clusters and associations: individual: NGC 6994
techniques: photometric
description We present the results of BV(RI)<sub>KC</sub> CCD photometry down to V=21 mag in the region of NGC 6994. To our knowledge, no photometry has previously been reported for this object and we find evidences that it is a poor and sparse old open cluster, with a minimum angular diameter of 9 arcmin, i.e. larger than the 3 arcmin originally assigned to it. We obtain a color excess E<sub>B-V</sub> = 0.07 ± 0.02 mag by means of the BVIC technique. Based on the theoretical isochrones from VandenBerg (1985) that are in better agreement with our data, we estimate for this cluster a distance from the Sun of 620 pc (V<sub>0</sub> - M<sub>V</sub> = 9 ± 0.25 mag) and an age lying within the range of 2 - 3 Gyr, adopting solar metallicity. Thus, the corresponding cluster's Galactocentric distance is 8.1 kpc and is placed at about 350 pc below the Galactic plane. According to these results, NGC 6994 belongs to the old open cluster population located in the outer disk and at large distances from the Galactic plane, and must have suffered significant individual dynamical evolution, resulting in mass segregation and evaporation of low mass stars.
format Articulo
Articulo
author Bassino, Lilia Patricia
Waldhausen, Silvia
Martínez, Rubén Enrique
author_facet Bassino, Lilia Patricia
Waldhausen, Silvia
Martínez, Rubén Enrique
author_sort Bassino, Lilia Patricia
title CCD photometry in the region of NGC 6994: the remains of an old open cluster
title_short CCD photometry in the region of NGC 6994: the remains of an old open cluster
title_full CCD photometry in the region of NGC 6994: the remains of an old open cluster
title_fullStr CCD photometry in the region of NGC 6994: the remains of an old open cluster
title_full_unstemmed CCD photometry in the region of NGC 6994: the remains of an old open cluster
title_sort ccd photometry in the region of ngc 6994: the remains of an old open cluster
publishDate 2000
url http://sedici.unlp.edu.ar/handle/10915/93554
https://ri.conicet.gov.ar/handle/11336/37078
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AT waldhausensilvia ccdphotometryintheregionofngc6994theremainsofanoldopencluster
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