ON THE QUESTION OF THE HELIUM ABUNDANCE IN ORION A MEASURED BY RADIO RECOMBINATION LINES. AND THE PRIMORDIAL HELIUM ABUNDANCE
Recombination radio lines (RRLs) of hydrogen (H), helium (He-4), and carbon (C) are a powerful tool for studying the interstellar medium (ISM) in space. The RRLs observations allow to obtain the physical parameters of regions of ionized hydrogen (HII regions) as well as of the photo-dissociation reg...
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| Format: | Article |
| Language: | English |
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Odessa I. I. Mechnykov National University
2020-11-01
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| Series: | Odessa Astronomical Publications |
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| Online Access: | http://oap.onu.edu.ua/article/view/216303 |