Non-LTE analysis of the ultraviolet spectrum of A Type stars. I Copernicus observations of the LY alpha profile in VEGA (A 0 V)

Details Non-LTE analysis of the ultraviolet spectrum of A Type stars. I Copernicus observations of the LY alpha profile in VEGA (A 0 V) Non-LTE analysis of the ultraviolet spectrum of A Type stars. I Copernicus observations of the LY alpha profile in VEGA (A 0 V)

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98...92p&link_type=abstract

Astronomy and Astrophysics, vol. 98, no. 1, May 1981, p. 92-95.

Astronomy and Astrophysics

Astronomy

9

A Stars, Lyman Alpha Radiation, Stellar Spectra, Ultraviolet Astronomy, Chromosphere, High Resolution, Nonequilibrium Thermodynamics, Oao 3

Scientific paper

Observations of the region of Lyα (1103-1360 Å) have been obtained with 0.2 Å spectral resolution, by means of the Copernicus satellite. The central part (1214-1217 Å) was scanned 100 times. No emission is detectable, nor the interstellar Lyα line. All parts of the profile observed with non zero signal are indeed the wings, and are interpreted in the following paper. No evidence for a chromosphere can be derived.

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