Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226..460s&link_type=abstract
Astrophysical Journal, Part 1, vol. 226, Dec. 1, 1978, p. 460-468. Research supported by the Robert A. Welch Foundation.
Astronomy and Astrophysics
Astronomy
46
Astronomical Spectroscopy, Interstellar Matter, Interstellar Radiation, Spectral Bands, Ultraviolet Astronomy, Astronomical Catalogs, Early Stars, Stellar Spectra, Wavelengths
Scientific paper
The coude spectrograph of the 2.7-m telescope at McDonald Observatory has been used with a Reticon detector to search for diffuse interstellar features in the wavelength region 6500-8900 A. Low-resolution (0.92 A) spectra of 15 spectral-type O, B, and A stars with color excesses ranging from E(B - V) equals 0.00 to 1.28 were recorded. These spectra show the previously detected features in this wavelength region at 6613, 6661, and 8621 A; confirm the interstellar nature of a previously suspected feature at 6699 A; and show several new features: at 7562 A of definite, at 7570, 8650 A of probable, and at 8572, 8384 A of possible interstellar origin. Correlations between diffuse-feature equivalent widths and color excess are presented. As in the near-ultraviolet, the frequency of occurrence of diffuse features in the near-infrared per unit energy interval is much less than in the visual.
Sanner Fred
Snell Ronald
vanden Bout Paul
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