Grey extinction in the solar neighbourhood?
1
Toruń Centre for Astronomy (TCfA), Nicholas Copernicus University, Gagarina 11, 87-100 Toruń, 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
Corresponding author: A. Strobel, strobel@astri.uni.torun.pl
Received:
21
March
2003
Accepted:
19
June
2003
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
© ESO, 2003