ISO observations of CH Cyg

Details ISO observations of CH Cyg ISO observations of CH Cyg

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..397s&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 397

Computer Science

10

Circumstellar Matter, Stars: Individual: Ch Cyg, Stars: Late-Type, Binaries: Symbiotic, Stars: Fundamental Parameters

Scientific paper

The symbiotic red giant CH Cyg is a bright IR source and we discuss the salient spectral features of its SWS and LWS spectrum. We find strong OH and weak H2O emission between 60 and 130 μm. This is qualitatively different from W Hya, a single semiregular M8-M9 giant, where OH emission is absent and the dominant cooling species in the molecular envelope is water. Apart from the well known photospheric absorptions of CO, OH and SiO we also suspect traces of HCl. We find relatively weak PAH features which indicate that apart from the oxygen rich material from the red giant, there may be carbon rich material ejected from the companion star. Much of the ISO wavelength range is dominated by the emission of silicate dust. A good model fit can be obtained with standard dust properties. We present a procedure by which radii of symbiotic red giants can be determined if the J and K magnitudes and the distance is known. The radius of the red giant in CH Cyg is R=280+/-65 Rodot.

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