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Radio observations of CH in front of globular clusters and the galactic gas-to-dust ratio
The gas-to-dust ratio beyond the immediate solar neighborhood isinvestigated using observations of the CH ground state emission line at3335 MHz toward 16 globular clusters. The results show that the N(CH) toE(B - V) ratio is significantly lower for the globular cluster lines ofsight than for dark clouds. The total hydrogen column density toward theglobular clusters is obtained, and its ratio to E(B - V) is found to bein agreement with other observations. The ratio is used to derive acolor excess E(B - V) = 1.6 m + or - 0.2 m for the Pal 10 cluster, whichdiffers significantly from the cosec-law value of 1.15 m, the onlyavailable color excess estimate for Pal 10 so far.
| Photometric Observations of RZ Eridani
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