A&A 408, 297-304 (2003)
DOI: 10.1051/0004-6361:20030998

Grey extinction in the solar neighbourhood?

W. Skórzynski¹, A. Strobel¹ and G. A. Galazutdinov<sup>1, 2, 3

1</sup>  Torun Centre for Astronomy (TCfA), Nicholas Copernicus University, Gagarina 11, 87-100 Torun, Poland
    e-mail: red@astri.uni.torun.pl
²  Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Russia
    e-mail: gala@sao.ru
³  Isaac Newton Institute of Chile, SAO Branch, Russia

(Received 21 March 2003 / Accepted 19 June 2003 )

Abstract
Some of the close O and B dwarfs appear to be fainter than indicated by their Hipparcos distances, intrinsic absolute magnitudes attributed to their spectral types, and estimated selective interstellar extinction. This discrepancy is explained in the paper by the grey (neutral) interstellar extinction in the visual range of spectrum. The measure of such an effect is related to discrete features of the interstellar matter.

Key words: ISM: dust -- extinction

Offprint request: A. Strobel, strobel@astri.uni.torun.pl

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