Optical polarization study in the open cluster NGC 6250

We present (UBVRI) multicolour linear polarimetric data for 32 of the brightest stars in the area of the open cluster NGC 6250, with the aim of studying the properties of the interstellar medium (ISM) towards the cluster. Our data yield a mean polarization per cent, close to the polarization value p...

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Autores principales: Feinstein Baigorri, Carlos, Vergne, María Marcela, Martínez, Rubén Enrique, Orsatti, Ana María
Formato: Articulo
Lenguaje:Inglés
Publicado: 2008
Materias:
Ciencias Astronómicas
Dust, extinction
Open clusters and associations: individual: NGC 6250
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84273
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84273
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
Open clusters and associations: individual: NGC 6250
spellingShingle Ciencias Astronómicas
Dust, extinction
Open clusters and associations: individual: NGC 6250
Feinstein Baigorri, Carlos
Vergne, María Marcela
Martínez, Rubén Enrique
Orsatti, Ana María
Optical polarization study in the open cluster NGC 6250
topic_facet Ciencias Astronómicas
Dust, extinction
Open clusters and associations: individual: NGC 6250
description We present (UBVRI) multicolour linear polarimetric data for 32 of the brightest stars in the area of the open cluster NGC 6250, with the aim of studying the properties of the interstellar medium (ISM) towards the cluster. Our data yield a mean polarization per cent, close to the polarization value produced by the ISM with normal efficiency for a mean colour excess of E B- V = 0.37. Our analysis indicates that the observed visual absorption in NGC 6250 is caused by a nearby dust layer (within 300 pc) producing a polarization with an angle close to the Galactic plane (θGP ∼ 38°). In addition, there are at least two more dust layers along the line of sight between the Sun and the cluster producing a change in the observed polarization, making our results compatible with Neckel and Klare's results. The observations show differences between the orientation of the local magnetic field of the nearby dust layer and the one that is polarizing along the way to the cluster (Δθv = 20°). The internal dispersion of the polarization values for the members of NGC 6250 seems to be compatible with the presence of intracluster dust. The majority of observed stars do not present evidence of intrinsic polarization in their light. In this work, we also show (as in several previous papers) how polarimetry is an excellent technique for identifying non-member stars.
format Articulo
Articulo
author Feinstein Baigorri, Carlos
Vergne, María Marcela
Martínez, Rubén Enrique
Orsatti, Ana María
author_facet Feinstein Baigorri, Carlos
Vergne, María Marcela
Martínez, Rubén Enrique
Orsatti, Ana María
author_sort Feinstein Baigorri, Carlos
title Optical polarization study in the open cluster NGC 6250
title_short Optical polarization study in the open cluster NGC 6250
title_full Optical polarization study in the open cluster NGC 6250
title_fullStr Optical polarization study in the open cluster NGC 6250
title_full_unstemmed Optical polarization study in the open cluster NGC 6250
title_sort optical polarization study in the open cluster ngc 6250
publishDate 2008
url http://sedici.unlp.edu.ar/handle/10915/84273
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AT vergnemariamarcela opticalpolarizationstudyintheopenclusterngc6250
AT martinezrubenenrique opticalpolarizationstudyintheopenclusterngc6250
AT orsattianamaria opticalpolarizationstudyintheopenclusterngc6250
bdutipo_str Repositorios
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