Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26as..144..195o&link_type=abstract
Astronomy and Astrophysics Supplement, v.144, p.195-202
Astronomy and Astrophysics
Astrophysics
10
Ism: Dust, Extinction, Galaxy: Open Clusters And Associations: Individual (Ngc 6611), Ism: Hii Regions, Ism: Magnetic Fields
Scientific paper
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 eta Carinae nebula by Tapia et al. (\cite{TRMR88b}) and subsequently confirmed by Marraco et al. (\cite{MVV93}), the canonical relation between {E_{ V-K}/E_{ B-V}} and lambda_max (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 (\cite{CW90}). 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. \cite{VOM94}), another young open cluster in close relation with an H ii region. Table 1 only available in electronic form at CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
Marraco Hugo G.
Orsatti Ana Maria
Vega Irene E.
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