Other
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..381o&link_type=abstract
The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 381
Other
3
Infrared Spectroscopy, Mira Variables, Circumstellar Emission, Dust Formation
Scientific paper
Two M-type Mira variables, Z Cyg and T Cep, have been observed with SWS01 over an entire light variability cycle. Each star was observed 7 times with an interval of variability phase of approximately 0.2. Z Cyg has prominent ``silicate bands'' at 10 and 20 μm and shows large variation in the circumstellar emission. The 10 and 20 μm bands become stronger relative to the photospheric emission at maximum than at minimum and the relative intensity of the 10 μm to the 20 μm bands increases at maximum, indicating increase in the temperature of circumstellar grains. In contrast, T Cep shows relatively small, but complicated variation in its SWS spectrum. The dust shell emission is weak in T Cep compared to Z Cyg. It has atypical 10 μm feature, peaking at λ > 10 μm and band emission around 13 μm. It also shows several molecular features, including 13-17 μm CO2 and 7.3 μm SO2 bands, both of which originate from the layers of temperature of less than 1000 K. These circumstellar molecular bands show significant variations. On the other hand, the continuum slope of the dust emission in T Cep shows little change, indicating that the dust temperature does not vary largely during light variation. Neither the circumstellar molecular features nor the dust continuum intensity seems to vary synchronously with the visual light variation. The amounts of SO2 molecules and dust grains seem to be decreasing after the maximum.
Cami Jan
de Jong Teije
Onaka Takashi
Tanab'e T.
Yamamura Issei
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