Photopolarimetric studies of Comet Austin

Details Photopolarimetric studies of Comet Austin Photopolarimetric studies of Comet Austin

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992japa...13..267j&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 13, no. 3, p. 267-277.

Astronomy and Astrophysics

Astrophysics

4

Astronomical Photometry, Austin Comet, Cosmic Dust, Error Analysis, Polarimetry, Energy Distribution, Solar Flux

Scientific paper

Results are presented of photopolarimetric observations of Comet Austin with the IAU/IHW filter system obtained on the 2.34-m Vainu Bappu Telescope at Kavalur, India, during preperihelion phase on February 20, 1990 and on the 1.2-m telescope at Gurusikhar, Mount Abu, during postperihelion phase on May 2 and 4, 1990. The flux distribution of the comet as observed through three IAU/IHW continuum filters is bluer on May 2 and 4 compared with the solar flux distribution. Wavelength dependence of polarization in the comet on May 2 and 4 shows that the polarization decreases sharply with decreasing wavelength. Polarization vectors in continuum and emission bands are perpendicular to the scattering plane. The steep wavelength dependence of the degree of polarization and the bluer flux distribution compared to a solar analog indicate that the dust size distribution lies in a narrow range and the sizes of the dominant particle are expected in the range of 0.1 to 0.5 micron.

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