LkH-alpha 198 and V 376 Cassiopeiae - Speckle interferometric and polarimetric observations of circumstellar dust

Details LkH-alpha 198 and V 376 Cassiopeiae - Speckle interferometric and polarimetric observations of circumstellar dust LkH-alpha 198 and V 376 Cassiopeiae - Speckle interferometric and polarimetric observations of circumstellar dust

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246..180l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. 180-194.

Astronomy and Astrophysics

Astrophysics

39

A Stars, Astronomical Polarimetry, B Stars, Cosmic Dust, Speckle Interferometry, Stellar Envelopes, Albedo, Interstellar Matter, Molecular Flow, Reflection Nebulae, Star Formation, Stellar Structure

Scientific paper

The circumstellar material close to the stellar sources is investigated, and its distribution and its relations to the general optical appearance and the orientation of the molecular outflow are determined. Speckle observations were carried out with a near-infrared speckle interferometer between September 1986 and October 1989. LkH-alpha 198 shows a complicated structure without clear alignment, and this is also true on subarcsec (less than 1000 AU) scales. V 376 Cas appears to be a bipolar nebula, seen nearly edge-on, oriented at position angle 120 deg. The orientations of LkH-alpha 198 and V 376 show no obvious relations with the interstellar field direction. The near-infrared albedo of circumstellar dust is quite high both in the case of LkH-alpha 198 and V 376 Cas, which indicates a larger particle size than typical for interstellar dust.

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