Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..305f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 2, April 1985, p. 305-310. Research supported by the Consiglio Nazion
Astronomy and Astrophysics
Astrophysics
30
Ionized Gases, Line Spectra, Nebulae, Stellar Envelopes, Stellar Winds, H Ii Regions, H Lines, Helium, Infrared Spectra, Stellar Luminosity
Scientific paper
The authors present new observations that help set the parameters of the ionized circumstellar envelope of S 106-IRS 4. The part of the envelope that is optically thick at 1.35 cm wavelength is smaller than 0arcsec.15 diameter which corresponds to 90 AU at 600 pc distance. The profiles of the Brackett-α and -γ lines are somewhat different with half power widths of 121±10 and 181±15 km s-1, respectively. The He I (21P-21S) line is detected at the S 106 nebula but not at IRS 4. The He I line emission of the nebula indicates that the central star of IRS 4 must have an effective temperature of about 35,000K. Comparison of the wind model scenario presented by Felli et al. (1984) with the present data and the Paschen line and Paschen edge data of McGregor et al. (1984) shows that the model encounters difficulties when observables that require details of the velocity field and of the innermost regions of the flow are considered.
Felli Marcello
Fischer Jan
Hamann Fred
Simon Manfred
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