2016MNRAS.455..540D


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.29CET21:59:08

2016MNRAS.455..540D - Mon. Not. R. Astron. Soc., 455, 540-551 (2016/January-1)

Deuterium enrichment of the interstellar grain mantle.

DAS A., SAHU D., MAJUMDAR L. and CHAKRABARTI S.K.

Abstract (from CDS):

We carry out Monte Carlo simulation to study deuterium enrichments of interstellar grain mantles under various physical conditions. Based on the physical properties, various types of clouds are considered. We find that in diffuse cloud regions, very strong radiation fields persists and hardly a few layers of surface species are formed. In translucent cloud regions with a moderate radiation field, significant number of layers would be produced and surface coverage is mainly dominated by photo-dissociation products such as, C,CH3,CH2D,OH and OD. In the intermediate dense cloud regions (having number density of total hydrogen nuclei in all forms ∼ 2x104/ cm3), water and methanol along with their deuterated derivatives are efficiently formed. For much higher density regions ( ∼ 106/ cm3), water and methanol productions are suppressed but surface coverages of CO,CO2,O2andO3 are dramatically increased. We find a very high degree of fractionation of water and methanol. Observational results support a high fractionation of methanol but surprisingly water fractionation is found to be low. This is in contradiction with our model results indicating alternative routes for de-fractionation of water. Effects of various types of energy barriers are also studied. Moreover, we allow grain mantles to interact with various charged particles (such as H+,Fe+, S+ and C+) to study the stopping power and projected range of these charged particles on various target ices.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): astrochemistry - ISM: abundances - dust, extinction - ISM: molecules

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 324 0
2 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 378 3
3 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 575 1
4 Kim 1-38 * 04 39 38.8673861844 +26 11 26.630421918           K1III 124 0
5 NAME OMC1 Ridge reg 05 35 13.4 -05 23 07           ~ 121 0
6 NAME Mon R2 IRS 2 * 06 07 45.83 -06 22 53.5           B0 99 0
7 NAME Mon R2 IRS 3 Y*O 06 07 47.8 -06 22 55           ~ 133 0
8 RAFGL 989 Y*O 06 41 10.1592954288 +09 29 33.635497596   17.4 16.8 18.26 17.28 B2 236 0
9 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 675 1
10 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 263 1
11 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1011 1
12 NAME IRAS 16293E cor 16 32 29.3 -24 29 13           ~ 52 1
13 W 33a Y*O 18 14 39.0 -17 52 03           ~ 573 0
14 RAFGL 7009S Y*O 18 34 20.911 -05 59 42.23           ~ 186 0
15 V* V710 CrA Or* 19 01 50.67792 -36 58 09.6132           K7: 114 0
16 [WBN74] NGC 7538 IRS 9 Y*O 23 14 01.63 +61 27 20.2           ~ 340 0

    Equat.    Gal    SGal    Ecl

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2020.01.29-21:59:08

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