The extended emission around GK Per - stranger and stranger

Details The extended emission around GK Per - stranger and stranger The extended emission around GK Per - stranger and stranger

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..309e&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 309

Computer Science

Old Novae, Classical Novae, Gk Per, Circumstellar Matter

Scientific paper

GK Per is a classical nova which erupted in 1901. At an estimated distance of 500 pc, circumstellar matter is found to extend north-west to south-east over 5 pc. Studies at mm wavelengths show CO emission. IRAS observations at 12, 25, 60, and 100 μm, imaged the extended nebulosity and suggested it consisted of 23 K `crystalline' dust. A diffuse 100 K dust component may also be present close to the nova. The environment of GK Per was observed with ISO PHT-C at 120, 160 and 180 μm. The structure found in previous HIRAS images is confirmed. The brightness distribution has 120 < λmax < 180 μm, suggesting the dust is cooler than previously thought. Modelling the emission in terms of dust, it can be expected that the emissivity β-index will be in the range 0 to 2. However, comparison of flux densities from ISO and IRAS suggests this is not the case, and we discuss several possibilities.

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