Journal
ASTROPHYSICAL JOURNAL
Volume 684, Issue 1, Pages 358-363Publisher
IOP PUBLISHING LTD
DOI: 10.1086/590242
Keywords
ISM : abundances; ISM : atoms; ISM : lines and bands; planetary nebulae : general
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Funding
- NASA [NAS5-32985]
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The negative ion H- is widely understood to be important in many astrophysical environments, including the atmospheres of late-type stars like the Sun. However, the ion has never been detected spectroscopically outside the laboratory. A search for the far-ultraviolet autodetaching transitions of H- in interstellar and circumstellar matter seems to be the best hope for directly detecting this ion. We undertook a highly sensitive search using data from the FUSE instrument. We concentrated on two types of sight lines: planetary nebulae, where model calculations suggest a sufficient abundance of H- to be determined, and translucent clouds, where H- might form on dust grains as an intermediate step in molecular hydrogen formation. Upper limits on H- abundances were set.
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