Silicate Feature Variation in Long-period Variable Stars. I. Initial Observations
Abstract
We report new mid-infrared spectra of five bright, long-period variable (LPV) stars, as well as related objects, obtained at the Wyoming Infrared Observatory with Denver University's medium-resolution CAESR instrument. The data, when combined with low-resolution spectrometer spectra from IRAS, show variation of the silicate feature with phase of the LPV. We perform a calculation for impingement time of the shock on the circumstellar dust shell to demonstrate that this variation could be the result of a shock-shell interaction.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1997
- DOI:
- 10.1086/303723
- Bibcode:
- 1997ApJ...477..825C
- Keywords:
-
- Stars: Circumstellar Matter;
- ISM: Dust;
- Extinction;
- Infrared: Stars;
- stars: variables: other long-period variables