Optical multicolor polarization observations in the region of the open cluster NGC 5749

We present (UBVRI) multicolor linear polarimetric data for 31 of the brightest stars in the area of the open cluster NGC 5749 considered to study the properties of the interstellar medium (ISM) towards the cluster. Our data yield a mean polarization percentage of Pv ∼ 1.7%, close to the polarization...

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Detalles Bibliográficos
Autores principales: Vergne, María Marcela, Feinstein Baigorri, Carlos, Martínez, Rubén Enrique
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Astronómicas
ISM: dust, extinction
Open clusters and associations: individual: NGC 5749
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82966
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82966
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
ISM: dust, extinction
Open clusters and associations: individual: NGC 5749
spellingShingle Ciencias Astronómicas
ISM: dust, extinction
Open clusters and associations: individual: NGC 5749
Vergne, María Marcela
Feinstein Baigorri, Carlos
Martínez, Rubén Enrique
Optical multicolor polarization observations in the region of the open cluster NGC 5749
topic_facet Ciencias Astronómicas
ISM: dust, extinction
Open clusters and associations: individual: NGC 5749
description We present (UBVRI) multicolor linear polarimetric data for 31 of the brightest stars in the area of the open cluster NGC 5749 considered to study the properties of the interstellar medium (ISM) towards the cluster. Our data yield a mean polarization percentage of Pv ∼ 1.7%, close to the polarization value produced by the ISM with normal efficiency (P(%) = 3.5E (B-V)0.8) for a mean color excess of EB-V = 0.42. The mean angle of polarization vectors, θ = 74°, agrees quite well with the expected angle produced by dust particles aligned in the direction of the galactic disk (and the magnetic field) in the region. Our analysis indicates that the visual absorption affecting the stars in NGC 5749 is partially produced by a dust layer located up to 300 pc from the Sun and also by a second layer of dust closer to the cluster (located at least at 700 pc). The observed photometry and our polarization data are consistent with the existence of dust within the cluster. We also show in this work how polarimetry could be an excellent technique for identifying nonmember stars.
format Articulo
Articulo
author Vergne, María Marcela
Feinstein Baigorri, Carlos
Martínez, Rubén Enrique
author_facet Vergne, María Marcela
Feinstein Baigorri, Carlos
Martínez, Rubén Enrique
author_sort Vergne, María Marcela
title Optical multicolor polarization observations in the region of the open cluster NGC 5749
title_short Optical multicolor polarization observations in the region of the open cluster NGC 5749
title_full Optical multicolor polarization observations in the region of the open cluster NGC 5749
title_fullStr Optical multicolor polarization observations in the region of the open cluster NGC 5749
title_full_unstemmed Optical multicolor polarization observations in the region of the open cluster NGC 5749
title_sort optical multicolor polarization observations in the region of the open cluster ngc 5749
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/82966
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AT feinsteinbaigorricarlos opticalmulticolorpolarizationobservationsintheregionoftheopenclusterngc5749
AT martinezrubenenrique opticalmulticolorpolarizationobservationsintheregionoftheopenclusterngc5749
bdutipo_str Repositorios
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