Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..610h&link_type=abstract
Astrophysical Journal, Part 1, vol. 252, Jan. 15, 1982, p. 610-615.
Astronomy and Astrophysics
Astrophysics
76
A Stars, Astronomical Spectroscopy, B Stars, Interstellar Matter, Line Spectra, Supergiant Stars, Atmospheric Attenuation, Atmospheric Moisture, Potassium, Red Shift, Spectral Resolution
Scientific paper
The diffuse interstellar bands at 6195 and 6613 A and two new features at 6993 and 7223 A are observed with an echelle scanner in several reddened B-type and early A-type supergiants. The resolution is either 2.6 or 4.6 km/sec at 6613 A. When interfering atmospheric H2O lines are removed, no evidence is found in any of these features for any fine structure, although at 6613 A there is unsharp structure on the shortward side and an extended wing to longer wavelengths. The interstellar K I lines are also compared with that of the diffuse features. The sharpest diffuse band at 6195 A (full width at half-depth, 0.34 A) is in HD 183143 partially resolvable into two lines having the same splitting as K I. In similar fashion, the structure at 6613 A in HD 183143 is a blurred version of that seen in single-cloud stars; it also can be decomposed into two equal components having the K I separation.
David Soderblom R.
Herbig George H.
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