Dust properties in NGC 6611

An investigation on dust properties in the NW portion of NGC 6611 has been conducted polarimetrically to test the existence of abnormal extinction in that section of the open cluster in an independent way. As previously suggested for the η Carinae nebula by Tapia et al. (1988b) and subsequently conf...

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Detalles Bibliográficos
Autores principales: Orsatti, A.M., Vega, E.I., Marraco, H.G.
Formato: JOUR
Materias:
Galaxy: Open clusters and associations: Individual (NGC 6611)
ISM: Dust, extinction
ISM: HII regions
ISM: Magnetic fields
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03650138_v144_n2_p195_Orsatti
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03650138_v144_n2_p195_Orsatti
record_format dspace
spelling todo:paper_03650138_v144_n2_p195_Orsatti2023-10-03T15:27:42Z Dust properties in NGC 6611 Orsatti, A.M. Vega, E.I. Marraco, H.G. Galaxy: Open clusters and associations: Individual (NGC 6611) ISM: Dust, extinction ISM: HII regions ISM: Magnetic fields An investigation on dust properties in the NW portion of NGC 6611 has been conducted polarimetrically to test the existence of abnormal extinction in that section of the open cluster in an independent way. As previously suggested for the η Carinae nebula by Tapia et al. (1988b) and subsequently confirmed by Marraco et al. (1993), the canonical relation between EV-K/EB-V and λmax (the wavelength of maximun interstellar polarization) is not valid for stars belonging to dusty H II regions, as is the case for the observed portion of M 16. This may arise mainly from the presence of silicate grains of a slightly larger size than the standard ISM and also from a considerable increase in mean graphite grain size, according to previous results from Chini & Wargau (1990). About 50% of the observed stars in NGC 6611 present indications of intrinsic polarization in their measurements; a similar percentage was found in IC 2944 (Vega et al. 1994), another young open cluster in close relation with an H II region. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03650138_v144_n2_p195_Orsatti
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Galaxy: Open clusters and associations: Individual (NGC 6611)
ISM: Dust, extinction
ISM: HII regions
ISM: Magnetic fields
spellingShingle Galaxy: Open clusters and associations: Individual (NGC 6611)
ISM: Dust, extinction
ISM: HII regions
ISM: Magnetic fields
Orsatti, A.M.
Vega, E.I.
Marraco, H.G.
Dust properties in NGC 6611
topic_facet Galaxy: Open clusters and associations: Individual (NGC 6611)
ISM: Dust, extinction
ISM: HII regions
ISM: Magnetic fields
description An investigation on dust properties in the NW portion of NGC 6611 has been conducted polarimetrically to test the existence of abnormal extinction in that section of the open cluster in an independent way. As previously suggested for the η Carinae nebula by Tapia et al. (1988b) and subsequently confirmed by Marraco et al. (1993), the canonical relation between EV-K/EB-V and λmax (the wavelength of maximun interstellar polarization) is not valid for stars belonging to dusty H II regions, as is the case for the observed portion of M 16. This may arise mainly from the presence of silicate grains of a slightly larger size than the standard ISM and also from a considerable increase in mean graphite grain size, according to previous results from Chini & Wargau (1990). About 50% of the observed stars in NGC 6611 present indications of intrinsic polarization in their measurements; a similar percentage was found in IC 2944 (Vega et al. 1994), another young open cluster in close relation with an H II region.
format JOUR
author Orsatti, A.M.
Vega, E.I.
Marraco, H.G.
author_facet Orsatti, A.M.
Vega, E.I.
Marraco, H.G.
author_sort Orsatti, A.M.
title Dust properties in NGC 6611
title_short Dust properties in NGC 6611
title_full Dust properties in NGC 6611
title_fullStr Dust properties in NGC 6611
title_full_unstemmed Dust properties in NGC 6611
title_sort dust properties in ngc 6611
url http://hdl.handle.net/20.500.12110/paper_03650138_v144_n2_p195_Orsatti
work_keys_str_mv AT orsattiam dustpropertiesinngc6611
AT vegaei dustpropertiesinngc6611
AT marracohg dustpropertiesinngc6611
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