The outer atmosphere of the carbon star TX PISCIUM

Details The outer atmosphere of the carbon star TX PISCIUM The outer atmosphere of the carbon star TX PISCIUM

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161..305e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 2, June 1986, p. 305-313. Research supported by the Naturvetenskaplig

Astronomy and Astrophysics

Astronomy

41

Carbon Stars, Chromosphere, Spectrum Analysis, Stellar Envelopes, Emission Spectra, Iron, Magnesium, Mass Flow Rate, Radial Velocity, Radio Sources (Astronomy), Stellar Evolution

Scientific paper

A high-resolution LWP IUE spectrum of the bright N-type carbon star TX Psc demonstrates that the Mg II h and k emission profiles are strongly affected by absorption from Mg II, Mn I, probably Fe I, and possibly from molecules. The indication that the absorbing matter has a column density of not less than 10 to the 20th H atoms or molecules per sq cm is consistent with absorption in a slowly expanding envelope. The integrated Mg II line flux is found to be much greater than in 1981, and the radio CO (J = 1 - 0) line from the circumstellar shell is detected. Results for a column density of not larger than 10 to the 22nd H2 molecules/sq cm, and a radial velocity close to that of the star, are in agreement with those obtained from UV data. Some dust emission from carbon grains is suggested by the far infrared flux distribution, and a mass-loss rate estimation for the star of 10 to the -6th to 10 to the -8th solar masses is obtained.

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