Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1173l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, April 1990, p. 1173-1186.
Astronomy and Astrophysics
Astronomy
87
Emission Spectra, Mira Variables, Stellar Spectra, Color-Color Diagram, Infrared Astronomy Satellite, Interstellar Masers, Spectral Energy Distribution, Spectrometers, Water Masers
Scientific paper
A total of 291 M Mira variables with IRAS low-resolution spectrometer (LRS) spectra that have 8-micron fluxes greater than 15 Jy have been analyzed. After subtraction of a 2500 K blackbody energy distribution from the spectrum, the remaining difference spectra can be classified into seven groups, depending on the shape of their spectral emission features around 10 microns: Sil, Sil(+) Sil(2+), S, three-component, 'broad', and no feature. The spectral emission features are interpreted as being produced primarily by amorphous silicates with differing amounts of crystalline olivine. A weak broad feature at 9-13 microns is possibly produced by aluminum oxide and/or a size distribution of silicate particles that favors larger grains. The 8-22-micron IR excess, defined as the fraction of energy above the 2500 K continuum, shows only a slight tendency to correlate with period and no tendency to correlate with mass loss rate. Maser emission from OH and H2O is much more frequently detected in stars that show the Sil or Sil(+) emission feature, but SiO maser emission is detected with the same percentage in all emission feature classes with the exception of the S feature. Stars showing the S feature appear to be closely related to the MS and S stars.
Little Stephen J.
Little-Marenin Irene R.
No associations
LandOfFree
Emission features in IRAS LRS spectra of M Mira variables does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Emission features in IRAS LRS spectra of M Mira variables, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Emission features in IRAS LRS spectra of M Mira variables will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1379602