What question did this study set out to answer?

This study aims to derive UV extinction curves for O and B stars in the Cep OB3 association and understand interstellar grain impacts.

Ultraviolet observations of interstellar extinction near the Cepheus OB3 molecular cloud

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Randomized trial analyzes UV extinction curves in O and B stars, suggesting insights into interstellar grain physics.

This study aims to derive UV extinction curves for O and B stars in the Cep OB3 association and understand interstellar grain impacts.
Analyzed IUE data for O and B stars in the Cep OB3 region
Combined with ANS photometry of additional stars
Evaluated the shape and strength of extinction curves, focusing on the 2175 Å bump and its relation to reddening.
Identified that the far-UV extinction varies significantly across the region
The shape of the 2175 Å bump remains consistent despite varying extinction levels
The bump index can effectively deredden UV energy distributions of early-type stars when intrinsic indices are known.

Massa et al. (1984) studied this question.

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