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Published April 1971 | Published
Journal Article Open

Interstellar Absorption and Color Excesses in Sco OB-1


New spectral types and photometry are reported for numerous stars in Sco OB-1 and in the foreground of the association. The new data permit reddening in the local spiral arm to be subtracted out in a discussion of reddening in the gas and dust of an adjacent spiral arm. The reddening that occurs within the association Sco OB-1 itself appears to be normal and to have R = 3. Infrared fluxes indicate no deviations (in the reddening law from the ultraviolet to 2.2 μ) from the law for the local spiral arm in Scorpio. The new data show no evidence for a recently reported correlation between absolute magnitude and color excess.

Additional Information

© 1971 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 11 January 1971. We thank Dr. V. M. Blanco and the Cerro Tololo staff for extending to us the use of the southern observing facilities; we especially thank Ricardo Gonzales for his help in making the observations. This work was supported in part by National Science Foundation Grant GP 15-25 and National Aeronautics and Space Administration Grant NGL 05-002-007.

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Published - 1971AJ_____76__237S.pdf


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