The Galactic deuterium gradient
2009 ◽
Vol 5
(S268)
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pp. 179-180
Keyword(s):
The Sun
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AbstractThe Galactic deuterium abundance gradient has been determined from observations of DCN in Galactic molecular clouds. This is the only way to observe D throughout the Galaxy because the molecular clouds are not limited to the 2 kpc region around the Sun observed with FUSE and from DI. We used an astrochemistry model and the DCN/HCN ratios to estimate the underlying D/H ratios in 16 molecular clouds including five in the Galactic Center. The resulting positive Galactic D gradient and reduced Galactic Center D/H ratio imply that there are no significant Galactic sources of D, there is continuous infall of low-metallicity gas into the Galaxy, and that deuterium is cosmological.
Keyword(s):
1980 ◽
Vol 87
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pp. 397-404
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Keyword(s):
On the Mass and Metallicity Distributions of the Parent AGB Stars of O-Rich Presolar Stardust Grains
2009 ◽
Vol 26
(3)
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pp. 271-277
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Keyword(s):
1989 ◽
Vol 136
◽
pp. 129-133
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Keyword(s):