Recent high-dispersion observations of CH Cygni

Details Recent high-dispersion observations of CH Cygni Recent high-dispersion observations of CH Cygni

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..577w&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, Oct.-Nov. 1981, p. 577-580.

Astronomy and Astrophysics

Astronomy

11

Emission Spectra, High Dispersion Spectrographs, Line Spectra, Oxygen Spectra, Stellar Spectra, Variable Stars, Chromosphere, Forbidden Bands, Hot Stars, Radial Velocity, Sodium, Spectrograms, Spectrum Analysis, Tables (Data)

Scientific paper

In 1979-80 CH Cyg showed an increasingly intense emission spectrum. Forbidden lines of O I are now present and indicate a systemic velocity of -63.4 km/s. The Na I D lines show inverted P Cygni profiles. Large numbers of permitted and forbidden lines of singly ionized metals are present. Four components of circumstellar Ca II absorption lines are present and two components of Na I can be recognized. Broad, shallow absorption lines of He I are visible; they are likely to come from a hot star or an accretion disk. Nevertheless, a chromospheric event in a single star could be responsible for many of the observed features. Soft X-rays are not observed; hence CH Cyg does not have a corona nor are high-velocity shock waves present.

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