2013A&A...559A..53M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST01:56:55

2013A&A...559A..53M - Astronomy and Astrophysics, volume 559A, 53-53 (2013/11-1)

Chemical modeling of the L1498 and L1517B prestellar cores: CO and HCO+ depletion.

MARET S., BERGIN E.A. and TAFALLA M.

Abstract (from CDS):

Prestellar cores exhibit a strong chemical differentiation, which is mainly caused by the freeze-out of molecules onto the grain surfaces. Understanding this chemical structure is important, because molecular lines are often used as probes to constrain the core physical properties. Here we present new observations and analysis of the C18O(1-0) and H13CO+ (1-0) line emission in the L1498 and L1517B prestellar cores, located in the Taurus-Auriga molecular complex. We model these observations with a detailed chemistry network coupled to a radiative transfer code. Our model successfully reproduces the observed C18O(1-0) emission for a chemical age of a few 105 years. On the other hand, the observed H13CO+ (1-0) is reproduced only if cosmic-ray desorption by secondary photons is included, and if the grains have grown to a bigger size than average ISM grains in the core interior. This grain growth is consistent with the infrared scattered light (``coreshine'') detected in these two objects, and is found to increase the CO abundance in the core interior by about a factor four. According to our model, CO is depleted by about 2-3 orders of magnitude in the core center.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: abundances - ISM: molecules - stars: formation

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1008 0
2 LDN 1498 DNe 04 11.0 +24 58           ~ 241 0
3 NAME Tau-Aur Region SFR 04 30 +25.0           ~ 1180 1
4 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3309 0
5 NAME [BM89] L1517B cor 04 55 18.8 +30 38 04           ~ 127 0
6 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 653 0
7 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 674 1
8 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2929 0
9 NAME dze Oph Cloud Cld 16 37 09 -10 34.0           ~ 102 0
10 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 276 1
11 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 882 2

    Equat.    Gal    SGal    Ecl

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2019.10.22-01:56:55

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