A study of the silicate emission features of the IRAS low resolution spectra

Details A study of the silicate emission features of the IRAS low resolution spectra A study of the silicate emission features of the IRAS low resolution spectra

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183...29g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. 29-37.

Astronomy and Astrophysics

Astronomy

17

Astronomical Spectroscopy, Galaxies, Infrared Astronomy Satellite, Interstellar Extinction, Late Stars, Classifications, Galactic Bulge, Histograms, Signal To Noise Ratios, Silicates, Stellar Color

Scientific paper

Using the IRAS catalog of low resolution spectra, the authors have analyzed 1808 silicate emission features, the union of classes 2n and 6n. The sample size is large enough to establish average properties (e.g. energy distributions); correlations between luminosities, excesses, colour and coordinates; histograms and galactic distributions, with a good degree of confidence. Of particular interest are: the detection of the largest silicate excesses ever observed (⪆10) and their location in the bulge of the Galaxy; the progressive strengthening of the 10-μm silicate feature as the objects become fainter (and hence more distant); the tendency for the 10-μm excess to decrease as the galactic latitude increases; the ranges of "effective" dust temperatures (150 to 500K), star colour temperatures (700 to 5000K) and envelope optical thicknesses (0 to ≡0.5 at 10 μm). This analysis also points to the similarity of dust properties between IRAS objects and previously observed Long Period Variables.

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