Very broadband structure in the extinction curves of southern Milky Way stars

Details Very broadband structure in the extinction curves of southern Milky Way stars Very broadband structure in the extinction curves of southern Milky Way stars

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195...79v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 195, Apr. 1981, p. 79-88. Research supported by the Science Research Co

Astronomy and Astrophysics

Astronomy

30

Broadband, Interstellar Extinction, Milky Way Galaxy, Spectral Bands, Chemical Composition, Polarized Electromagnetic Radiation, Stellar Spectra

Scientific paper

Very broadband structure (VBS), previously detected in the interstellar extinction curve, is examined in detail for 22 reddened stars in the southern Milky Way. The VBS, which takes the form of a shallow depression in the 5200-6000 A region, appears to be a widespread feature of the general galactic extinction, with the central depth amounting to about 0.02 mag per magnitude of visual extinction for stars with long path-length reddening. Two stars in the Rho Ophiuchi dark cloud exhibit a modified form of VBS which may reflect chemical changes occurring on the grain surfaces. A possible identification of the VBS with solid magnetite (Fe3O4) in the grain material is discussed.

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