Electron scattering in the infalling envelope of the protostar S CrA

Details Electron scattering in the infalling envelope of the protostar S CrA Electron scattering in the infalling envelope of the protostar S CrA

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....90..338s&link_type=abstract

Astronomy and Astrophysics, vol. 90, no. 3, Oct. 1980, p. 338-340.

Astronomy and Astrophysics

Astrophysics

12

Early Stars, Electron Scattering, Protostars, Stellar Envelopes, Stellar Spectra, Balmer Series, Electronography, Line Spectra, Stellar Evolution

Scientific paper

Very broad shallow wings (total width ≍40 Å) of the Balmer lines Hα and Hβ of the YY Orionis star S CrA were measured from an electronographic spectrogram (dispersion 38 A/mm) and from two photographic coudé spectrograms (dispersion 20 Å/mm). The observed broad wings are interpreted in terms of noncoherent electron scattering of line photons in the infalling envelope of the low mass protostar S CrA. A crude model was adopted to fit the line profiles. From the fitting procedure we estimated the mean electron temperature of the shell to Te ≍ 7000-8000 K. The density at the inner boundary of the infalling envelope was estimated to qs ≍ 0.9 10-12 g cm-3.

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