Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.287..455b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 287, Issue 2, pp. 455-471.
Astronomy and Astrophysics
Astronomy
12
Infrared: Ism: Continuum, Radio Continuum: Ism, Radio Lines: Ism
Scientific paper
Sh 185, which is associated with the B0-B0.5IV star gamma Cas and contains the two nebulae IC 63 and IC 59, has been observed with the DRAO synthesis telescope in continuum emission at 408 and 1420MHz, and in H i line emission. Continuum emission is clearly detected for IC 63 and weakly detected for IC 59. The emission from both nebulae is thermal, with the masses of ionized gas being 0.08 and 0.07 Msolar, respectively. The masses of H i detected are 0.15 Msolar for IC 63, and 0.64 Msolar for IC 59. Infrared emission was detected in the IRAS survey from both IC 63 and IC 59, and also from a point source, IRAS 00556+6048, located between the two clouds. The infrared and radio luminosities of IC 63 and IC 59 are consistent with the heating and ionization being produced by gamma Cas. However, the time required to produce the observed H i through photodissociation is less than any reasonable age for gamma Cas by orders of magnitude. This suggests that the nebulae are density-bounded and the production of H i through photodissociation by radiation from gamma Cas has mostly ceased. The exception occurs in a small region of molecular gas in IC 63, where extended red emission and molecular hydrogen fluorescent emission are still observed. H i is also detected near IRAS 00556+6048. This H i appears to be associated with the infrared source, and with a velocity of -34kms^-1 suggests that the infrared source is not associated with Sh 185. The exciting star for IRAS 00556+6048 may be another example of a dissociating star.
Blouin D.
Bontekoe Romke Tj.
Dewdney Peter E.
Kester D.
McCutcheon William H.
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