Broad-band optical polarimetric studies of NGC1893

C. Eswaraiah1*, A. K. Pandey1, G. Maheswar1, B. J. Medhi1,J. C. Pandey1and D. K. Ojha2
1Aryabhatta Research Institute of Observational Sciences, Nainital 263 129, India
2Tata Institute of Fundamental Research, Mumbai 400 005, India

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We present the results obtained through new optical broad-band (BV(RI )c) polarimetric observations carried out towards NGC 1893. In this study we found at least two foreground dust layers present towards NGC 1893. One at 170 pc and another at 350 pc. Second dust layer was found to be mainly responsible for the observed polarization towards the cluster. The polarization efficiency toward NGC 1893 is found to be higher than mean value for the general diffuse interstellar medium, thereby indicating that the dust grains are aligned well with respect to the Galactic magnetic field. The weighted mean in the λmax (0.55 ± 0.01 μm), and the estimated Rv , the total-to-selective extinction (3.08 ± 0.05) are quite similar to the values corresponding to the general interstellar medium (ISM).

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Keywords : Polarization: dust, magnetic field, individual: NGC 1893.