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

Autores
Bassino, Lilia Patricia; Waldhausen, Silvia; Martínez, Rubén Enrique
Año de publicación
2000
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present the results of BV(RI)KC 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 EB-V = 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 (V0 - MV = 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.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
Materia
Astronomía
open clusters and associations: general
open clusters and associations: individual: NGC 6994
techniques: photometric
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:10915/93554
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/93554
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling CCD photometry in the region of NGC 6994: the remains of an old open clusterBassino, Lilia PatriciaWaldhausen, SilviaMartínez, Rubén EnriqueAstronomíaopen clusters and associations: generalopen clusters and associations: individual: NGC 6994techniques: photometricWe 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.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plata2000-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf138-144http://sedici.unlp.edu.ar/handle/10915/93554enginfo:eu-repo/semantics/altIdentifier/url/https://ri.conicet.gov.ar/handle/11336/37078info:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/hdl/11336/37078info:eu-repo/semantics/altIdentifier/arxiv/astro-ph/0001238info: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:UNLP2025-09-29T11:19:26Zoai:sedici.unlp.edu.ar:10915/93554Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:19:26.94SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv CCD photometry in the region of NGC 6994: the remains of an old open cluster
title CCD photometry in the region of NGC 6994: the remains of an old open cluster
spellingShingle CCD photometry in the region of NGC 6994: the remains of an old open cluster
Bassino, Lilia Patricia
Astronomía
open clusters and associations: general
open clusters and associations: individual: NGC 6994
techniques: photometric
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
dc.creator.none.fl_str_mv Bassino, Lilia Patricia
Waldhausen, Silvia
Martínez, Rubén Enrique
author Bassino, Lilia Patricia
author_facet Bassino, Lilia Patricia
Waldhausen, Silvia
Martínez, Rubén Enrique
author_role author
author2 Waldhausen, Silvia
Martínez, Rubén Enrique
author2_role author
author
dc.subject.none.fl_str_mv Astronomía
open clusters and associations: general
open clusters and associations: individual: NGC 6994
techniques: photometric
topic Astronomía
open clusters and associations: general
open clusters and associations: individual: NGC 6994
techniques: photometric
dc.description.none.fl_txt_mv 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.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
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.
publishDate 2000
dc.date.none.fl_str_mv 2000-03
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/93554
url http://sedici.unlp.edu.ar/handle/10915/93554
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://ri.conicet.gov.ar/handle/11336/37078
info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/hdl/11336/37078
info:eu-repo/semantics/altIdentifier/arxiv/astro-ph/0001238
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
138-144
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.070432

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