Detailed study of open cluster PIS 20

The very young open cluster Pis 20 has been analyzed by employing CCD UBVR photometry. Down to V = 19 mag, new blue and faint members were found. With them we obtain a better definition of the lower cluster main sequence. Using the fitting method we situate the cluster at a distance of d = 3600 pc (...

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Autores principales: Vázquez, Rubén Ángel, Will, J.M., Prado, P., Feinstein, Alejandro
Formato: Articulo Comunicacion
Lenguaje:Español
Publicado: 1994
Materias:
Astronomía
Galaxia
pis 20
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/159803
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SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-159803
record_format dspace
spelling I19-R120-10915-1598032023-11-06T20:02:08Z http://sedici.unlp.edu.ar/handle/10915/159803 Detailed study of open cluster PIS 20 Vázquez, Rubén Ángel Will, J.M. Prado, P. Feinstein, Alejandro 1994 2023-11-06T13:15:50Z es Astronomía Galaxia pis 20 The very young open cluster Pis 20 has been analyzed by employing CCD UBVR photometry. Down to V = 19 mag, new blue and faint members were found. With them we obtain a better definition of the lower cluster main sequence. Using the fitting method we situate the cluster at a distance of d = 3600 pc (Vo-Mv = 12.80). The main color excess value is <E(B-V)> = 1.24 mag. In analyzing observed characteristics and spatial positions of the bluest cluster stars we conclude that the star WR 67 has a good chance to be a cluster member. In that case the mass of its progenitor should be greater than 50 M⊙ according to evolutionary models. From isochrone fitting the age of Pis 20 is 5.1 x 10⁶ y. We discuss the cluster mass spectrum whose slope, within the observational uncertainties, appears to be similar to a Salpeter law. We notice that high WR/OB and WC/WN number ratios are present not only within the cluster itself but also in the association where Pis 20 is situated. The cluster distance derived here prevents to assume any spatial connection between Pis 20 and the supernova remnant MSH 15-52. The total cluster mass is around 600 M⊙. Asociación Argentina de Astronomía Articulo Comunicacion http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Astronomía
Galaxia
pis 20
spellingShingle Astronomía
Galaxia
pis 20
Vázquez, Rubén Ángel
Will, J.M.
Prado, P.
Feinstein, Alejandro
Detailed study of open cluster PIS 20
topic_facet Astronomía
Galaxia
pis 20
description The very young open cluster Pis 20 has been analyzed by employing CCD UBVR photometry. Down to V = 19 mag, new blue and faint members were found. With them we obtain a better definition of the lower cluster main sequence. Using the fitting method we situate the cluster at a distance of d = 3600 pc (Vo-Mv = 12.80). The main color excess value is <E(B-V)> = 1.24 mag. In analyzing observed characteristics and spatial positions of the bluest cluster stars we conclude that the star WR 67 has a good chance to be a cluster member. In that case the mass of its progenitor should be greater than 50 M⊙ according to evolutionary models. From isochrone fitting the age of Pis 20 is 5.1 x 10⁶ y. We discuss the cluster mass spectrum whose slope, within the observational uncertainties, appears to be similar to a Salpeter law. We notice that high WR/OB and WC/WN number ratios are present not only within the cluster itself but also in the association where Pis 20 is situated. The cluster distance derived here prevents to assume any spatial connection between Pis 20 and the supernova remnant MSH 15-52. The total cluster mass is around 600 M⊙.
format Articulo
Comunicacion
author Vázquez, Rubén Ángel
Will, J.M.
Prado, P.
Feinstein, Alejandro
author_facet Vázquez, Rubén Ángel
Will, J.M.
Prado, P.
Feinstein, Alejandro
author_sort Vázquez, Rubén Ángel
title Detailed study of open cluster PIS 20
title_short Detailed study of open cluster PIS 20
title_full Detailed study of open cluster PIS 20
title_fullStr Detailed study of open cluster PIS 20
title_full_unstemmed Detailed study of open cluster PIS 20
title_sort detailed study of open cluster pis 20
publishDate 1994
url http://sedici.unlp.edu.ar/handle/10915/159803
work_keys_str_mv AT vazquezrubenangel detailedstudyofopenclusterpis20
AT willjm detailedstudyofopenclusterpis20
AT pradop detailedstudyofopenclusterpis20
AT feinsteinalejandro detailedstudyofopenclusterpis20
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