Physics – Optics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....43...85g&link_type=abstract
Astronomy and Astrophysics, vol. 43, no. 1, Sept. 1975, p. 85-92.
Physics
Optics
8
Absorption Spectra, Diffuse Radiation, Galactic Evolution, Spectral Bands, A Stars, B Stars, Cassegrain Optics, Line Spectra, O Stars, Photomultiplier Tubes, Spiral Galaxies, Stellar Luminosity, X Ray Absorption
Scientific paper
Photoelectric narrow-band observations of the intensity of the diffuse interstellar 4430 A absorption band have been carried out for 65 southern O, B and A stars of luminosity classes I and II. The dependence of the 4430 A index on stellar spectral lines is eliminated and the variation of the ratio Jc/E(B-V) of 4430-A wavelength to selective absorption from place to place in the Galaxy is discussed. It is found that Jc/E(B-V) is significantly lower in the inter-arm region from inside the inner and outer spiral arms. The observed value of Jc/E(B-V) for HD 153919, the optical component of the binary system containing the X-ray source 2 U 1700-37, indicates a distance of at least 1.5 kpc which suggests that it is more luminous and massive than an ordinary O 6 star.
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