Polarimetry of an intermediate-age open cluster: NGC 5617

Aims. We present polarimetric observations in the UBVRI bands of 72 stars located in the direction of the medium age open cluster NGC 5617. Our intention is to use polarimetry as a tool in membership identification, by building on previous investigations intended mainly to determine the cluster'...

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Autores principales: Orsatti, Ana María, Feinstein Baigorri, Carlos, Vergne, María Marcela, Martínez, Rubén Enrique, Vega, Ema Irene
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Astronómicas
Dust
Extinction
Individual
NGC 5617
Open clusters and associations
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82424
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82424
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
Dust
Extinction
Individual
NGC 5617
Open clusters and associations
spellingShingle Ciencias Astronómicas
Dust
Extinction
Individual
NGC 5617
Open clusters and associations
Orsatti, Ana María
Feinstein Baigorri, Carlos
Vergne, María Marcela
Martínez, Rubén Enrique
Vega, Ema Irene
Polarimetry of an intermediate-age open cluster: NGC 5617
topic_facet Ciencias Astronómicas
Dust
Extinction
Individual
NGC 5617
Open clusters and associations
description Aims. We present polarimetric observations in the UBVRI bands of 72 stars located in the direction of the medium age open cluster NGC 5617. Our intention is to use polarimetry as a tool in membership identification, by building on previous investigations intended mainly to determine the cluster's general characteristics rather than provide membership suitable for studies such as stellar content and metallicity, as well as study the characteristics of the dust lying between the Sun and the cluster. Methods. The obsevations were carried out using the five-channel photopolarimeter of the Torino Astronomical Observatory attached to the 2.15 m telescope at the Complejo Astronómico El Leoncito (CASLEO; Argentina). Results. We are able to add 32 stars to the list of members of NGC 5617, and review the situation for others listed in the literature. In particular, we find that five blue straggler stars in the region of the cluster are located behind the same dust as the member stars are and we confirm the membership of two red giants. The proposed polarimetric memberships are compared with those derived by photometric and kinematical methods, with excellent results. Among the observed stars, we identify 10 with intrinsic polarization in their light. NGC 5617 can be polarimetrically characterized with Pmax = 4.40 % and θv = 73°1. The spread in polarization values for the stars observed in the direction of the cluster seems to be caused by the uneven distribution of dust in front of the cluster's face. Finally, we find that in the direction of the cluster, the interstellar medium is apparently free of dust, from the Sun's position up to the Carina-Sagittarius arm, where NGC 5617 seems to be located at its farthest border.
format Articulo
Articulo
author Orsatti, Ana María
Feinstein Baigorri, Carlos
Vergne, María Marcela
Martínez, Rubén Enrique
Vega, Ema Irene
author_facet Orsatti, Ana María
Feinstein Baigorri, Carlos
Vergne, María Marcela
Martínez, Rubén Enrique
Vega, Ema Irene
author_sort Orsatti, Ana María
title Polarimetry of an intermediate-age open cluster: NGC 5617
title_short Polarimetry of an intermediate-age open cluster: NGC 5617
title_full Polarimetry of an intermediate-age open cluster: NGC 5617
title_fullStr Polarimetry of an intermediate-age open cluster: NGC 5617
title_full_unstemmed Polarimetry of an intermediate-age open cluster: NGC 5617
title_sort polarimetry of an intermediate-age open cluster: ngc 5617
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/82424
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AT vergnemariamarcela polarimetryofanintermediateageopenclusterngc5617
AT martinezrubenenrique polarimetryofanintermediateageopenclusterngc5617
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bdutipo_str Repositorios
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