Observtions of a predicted diffuse interstellar line at 7581 A

Details Observtions of a predicted diffuse interstellar line at 7581 A Observtions of a predicted diffuse interstellar line at 7581 A

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135...77g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 1, June 1984, p. 77-80.

Astronomy and Astrophysics

Astrophysics

4

Astronomical Spectroscopy, B Stars, Interstellar Matter, Line Spectra, O Stars, Spectral Bands, Absorption Spectra, Helium, Stellar Spectra

Scientific paper

The existence of a predicted diffuse interstellar line at 7581 Å has been verified in the spectra of six reddened OB stars. Seven such stars, including HD 183143, were observed with a scanning echelle spectrometer at the Danish 1.5 m reflector at La Silla in the spectral region between 7574 and 7589 Å. The equivalent widths were found to have a strong correlation with the color excess. The weighted mean profile corresponding to unit color excess is found to be asymmetric like the core of a Fano profile and to have an equivalent width of 35±2 mÅ.

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