Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..731i&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, April 1, 1987, p. 731-739.
Astronomy and Astrophysics
Astronomy
Astronomical Catalogs, Infrared Sources (Astronomy), M Stars, Spaceborne Astronomy, Stellar Spectrophotometry, Supergiant Stars, Giant Stars, Infrared Astronomy Satellite, Radiant Flux Density, Stellar Color, Stellar Envelopes, T Tauri Stars
Scientific paper
The authors have studied 85 of the initially "unidentified" 88 Equatorial Infrared Catalogue 1 objects using the data from the Infrared Astronomical Satellite Point Source Catalog. The [2.2] - [12] versus [12] - [25] colour-colour diagram of these sources indicate that most of them are M giants or supergiants with or without circumstellar shells. One of the sources, EIC 146 has far-infrared colours typical of T Tauri stars. About 10 per cent of these sources have an IRAS variability index of 9 indicating significant time variation of [12] and [25] magnitudes. The authors have estimated the dust temperature for the 20 sources for which 12, 25 and 60 μm flux densities are available using the photometric data. They have also determined the dust temperature of the radiating (hot) dust and the optical depth at 9.7 μm (τ9.7) for the absorbing (cold) dust for six of these sources. A comparison with model calculation of Rowan-Robinson &Harris indicates ≡1/λ emissivity dependence between 25 and 60 μm.
Iyengar V. K. K.
Rengarajan T. N.
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