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TWO SPARSE OPEN CLUSTERS IN THE REGION OF COLLINDER 132.

© 1977. The Astronomical Society of the Pacific. All rights reserved. Printed in U.S.A.
, , Citation J. J. Clariá 1977 PASP 89 803 DOI 10.1086/130231

1538-3873/89/532/803

ABSTRACT

Photoelectric measurements in the UBV system are presented for 35 stars in the region of Cr 132. The intensity of the Hfl line was measured for 18 stars, most of them B stars. These UBV-Hfl data are interpreted as demonstrating the existence of two separate physical groups, called Cr 132a and Cr 132h, located at 560 pc and 330 pc from the sun. The clusters have nuclear ages of 6.0 x 10 and 1.6 x 10 years in Sandage's scale and are slightly reddened hy E(B - V) and , respectively. The eclipsing hinary FF CMa (HD 55173) appears to he most prohahly a memher of Cr 132a. Key words: open clusters- photometry

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10.1086/130231