The N$_{2}$D$^+$/N$_{2}$H$^+$ ratio as an evolutionary tracer of Class 0 protostars

Publisher： Edp Sciences

E-ISSN： 1432-0746|493|1|89-105

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.493, Iss.1, 2009-01, pp. : 89-105

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