Interstellar Na I and Ca II absorption in intercloud regions
Journal Article
·
· Astrophys. J., v. 202, no. 3, pp. 628-633
The weak interstellar absorption lines of Na i, Ca ii, and H i formed in the intercloud medium toward eight nearly unreddened stars are analyzed. Compared with the corresponding column densities within a standard cloud, the N (Na i)/N/sub H/ ratio is smaller by a factor probably in excess of 17, while the N (Ca ii)/N/sub H/ ratio is about normal. These results imply that the local intercloud medium extensively contains low-density H i regions in which the temperature Tapproximately-greater-than2500 K and the depletion of calcium is less severe than in the clouds by a factor of 20. (AIP)
- Research Organization:
- Yerkes Observatory, University of Chicago
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-33-024125
- OSTI ID:
- 4056830
- Journal Information:
- Astrophys. J., v. 202, no. 3, pp. 628-633, Journal Name: Astrophys. J., v. 202, no. 3, pp. 628-633; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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