Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.275..889w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 275, NO. 3/AUG1, P. 889, 1995
Astronomy and Astrophysics
Astronomy
8
Circumstellar Matter - Stars: Wolf-Rayet - Dust, Extinction - Infrared: Stars
Scientific paper
Near-infrared spectroscopy of two IRAS sources, and 18405A)448, whose LRS spectra suggested the presence of carbonaceous dust, confirms that the former is a late-type Wolf-Rayet (WC8-9) star and shows that the latter is not. Together with new red spectroscopy, our data for IRAS 18405A)448 show H I (Hα and Pa6-16), O I excited by the Lyβ fluorescence mechanism, Fe II, [S III] and [O II]. This shows that IRAS 18405-0448 is similar to luminous emission-line objects like LkHα 101 or η Car. The reddening from the continuum and Paschen decrement is found to be E(B - V) = 5.5±0.5 and that from the O I lines E(B - V) ≥ 4.5. It is suggested that this extinction is mostly circumstellar and that the corresponding absorption in the `silicates' feature can account for the IRAS LRS spectral shape. New photometry of IRAS indicates variability in the dust luminosity on a time-scale ˜1.4 yr, possibly caused by variation in the dust condensation rate.
Bouchet Patrice
Cohen Martin
Vacca William D.
van der Hucht Karel A.
Williams Peredur M.
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