Interstellar oxygen chemistry

Citation
S. Viti et al., Interstellar oxygen chemistry, ASTRON ASTR, 370(2), 2001, pp. 557-569
Citations number
50
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
0004-6361 → ACNP
Volume
370
Issue
2
Year of publication
2001
Pages
557 - 569
Database
ISI
SICI code
0004-6361(200105)370:2<557:IOC>2.0.ZU;2-W
Abstract
We present results of chemical models for a variety of types of regions: sh own by SWAS observations to contain less O-2 and H2O than previously expect ed. We identify time-dependent models for which O-2 and H2O abundances meet the SWAS constraints and for which calculated abundances of other species are in harmony with measurements made primarily at millimeter wavelengths. The phases of acceptable composition are transient in these time-dependent models but are of very substantial length in many models for which CO and N -2 are assumed to be returned promptly and unaltered to the gas: phase thou gh other species, except for H-2 and He, freeze-out onto the dust. We also consider whether the presence of bistability in some steady-state models ca n account for the SWAS and other observations.