Image Details
Caption: Fig. 5.
Normalized indices of Ca II IRT emission, ﹩R_{8498}﹩, vs. ﹩R_{\mathrm{H}\,\alpha }﹩ for stars in M34. As expected, the two quantities are well correlated overall, but the correlation breaks down among the weak emitters.
© 2001. The American Astronomical Society. All rights reserved. Printed in U.S.A.