The physical properties of the H-alpha-emission line stars - CD-42 deg 11721, KK OPH and XX OPH

Details The physical properties of the H-alpha-emission line stars - CD-42 deg 11721, KK OPH and XX OPH The physical properties of the H-alpha-emission line stars - CD-42 deg 11721, KK OPH and XX OPH

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.166...99d&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 166, no. 1, April 1990, p. 99-121.

Astronomy and Astrophysics

Astronomy

38

Early Stars, H Alpha Line, Stellar Envelopes, Stellar Spectrophotometry, Emission Spectra, Infrared Astronomy Satellite, Shell Stars, Stellar Physics, Stellar Spectra

Scientific paper

By use of the data found in the literature, observed at the ESO and taken from the IRAS point source catalog, the physical properties of the H-alpha-emission stars: CD-42 deg 11721, KK Oph and XX Oph were studied photometrically and spectroscopically. The results can be summarized as follows: (1) Fe II and forbidden Fe II emission lines show that these stars have a gaseous envelope of which part is of low density. (2) P Cygni profiles in the spectral lines of XX Oph indicate the existence of rapid gaseous motions in its atmosphere. The presence of P Cygni profiles in the spectra of the other two stars is not certain. (3) In the outer atmosphere of CD-42 deg 11721 and KK Oph at least two circumstellar concentrations of dust grains seems to be present; the temperatures of these dust shells are, for both stars, about 1200 and 250 K. (4) XX Oph has an M6III companion causing the infrared excess. Furthermore, the physical properties of the dust shells are studied. The distances to the central star, the chemical composition and the masses of each shell were estimated.

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