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J/MNRAS/403/1577 Polarization towards open cluster NGC 6823 (Medhi+, 2010)
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Beginning of ReadMe :J/MNRAS/403/1577 Polarization towards open cluster NGC 6823 (Medhi+, 2010)
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Polarization towards the young open cluster NGC 6823.
Medhi B.J., Maheswar G., Pandey J.C., Tamura M., Sagar R.
<Mon. Not. R. Astron. Soc., 403, 1577-1591 (2010)>
=2010MNRAS.403.1577M
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ADC_Keywords: Clusters, open ; Polarization
Keywords: polarization - dust, extinction -
open clusters and associations: individual: NGC 6823
Abstract:
We present multiwavelength linear polarimetric observations of 104
stars towards the region of young open cluster NGC 6823. The
polarization towards NGC 6823 is dominated by foreground dust grains
and we found evidence for the presence of several layers of dust
towards the line of sight. The first layer of dust is approximately
located within 200pc towards the cluster, which is much closer to the
Sun than the cluster itself ( 2.1kpc). The radial distribution of
the position angles for the member stars is found to show a systematic
change, while the polarization is found to reduce towards the outer
parts of the cluster and the average position angle of the coronal
region of the cluster is very close to the inclination of the Galactic
parallel ( 32deg). The size distribution of the grains within
NGC 6823 is similar to those in the general interstellar medium. The
patchy distribution of foreground dust grains is suggested to be
mainly responsible for both differential reddening and polarization
towards NGC 6823. The majority of the observed stars do not show
evidence of intrinsic polarization in their light.
Description:
The polarimetric data for the four fields (centred at
19:43:10+23:17:55; 19:43:24=+23:12:26; 19:43:24+23:23:55 and
19:42:4+23:17:43) in NGC 6823 were acquired using the ARIES Imaging
Polarimeter (AIMPOL) mounted on the Cassegrain focus of the 104cm
Sampurnanand Telescope of ARIES, Nainital in B, V and Rc photometric
bands, on 2007 May 24, May 25, June 6 and June 7.