The interstellar extinction law in some dusty HII regions

Details The interstellar extinction law in some dusty HII regions The interstellar extinction law in some dusty HII regions

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26as...45..451n&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 45, Sept. 1981, p. 451-454.

Astronomy and Astrophysics

Astrophysics

25

Astronomical Photometry, Cosmic Dust, H Ii Regions, Hydrogen Ions, Interstellar Extinction, B Stars, O Stars

Scientific paper

UBVRI data for 62 O and B stars in dusty H II regions and for nine field stars are presented. The data are used to investigate the reddening law in the range BVRI. For the field stars and the H II regions M8, M20, S5, S66, S67, the normal interstellar extinction law has been confirmed. However, in NGC 6334, NGC 6357 and M16 unusually high color excess ratios have been found: E(V-R)/E(B-V) and E(V-I)/E(B-V), indicating abnormal values of the ratio of total to selective extinction, R equals 3.8 for NGC 6334/6357 and R equals 4.0 for M16.

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