SIMBAD references

Interstellar extinction in a ∼100 sq. degree area at the Camelopardalis and Perseus border is investigated. The study is based on the results of photoelectric photometry of 455 stars in the seven-color Vilnius photometric system published earlier. The nearest 100 stars with Hipparcos parallaxes show that the extinction starts to grow at a distance of 110-150 pc. At a distance of 1 kpc the extinction A_V is within 1.2 and 2.4 mag. At larger distances the extinction determination is affected by the limiting magnitude effect. At distances >1.5 kpc a number of O-B stars with the extinctions between 2 and 4 mag are found.