Chemical evolution ahead of Herbig-Haro objects

被引：50

作者：

Viti, S ^{[1
]}

Williams, DA ^{[1
]}

机构：

[1] UCL, Dept Phys & Astron, London WC1E 6BT, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1999年 / 310卷 / 02期

关键词：

molecular processes; ISM : clouds; ISM : jets and outflows; ISM : molecules;

D O I：

10.1046/j.1365-8711.1999.02962.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Compact regions of enhanced HCO(+) and NH(3) emission have been detected close to a number of Herbig-Haro objects. An interpretation of these detections is the following: a transient clump within the molecular cloud has been irradiated by the shock that generates the Herbig-Haro object. The irradiation releases icy mantles from the grains within the transient clump and initiates a photochemistry. On the basis of this picture, we have developed an extensive chemical model which predicts that a wide range of species, other than NH(3) and HCO(+), should also be detectable. These include CH(3)OH, H(2)S, C(3)H(4), H(2)CO, SO, SO(2), H(2)CS and NS. The chemical effects should last similar to 10(4) yr.

引用

页码：517 / 526

页数：10

共 17 条

[1] CHEMICAL DIFFERENTIATION BETWEEN STAR-FORMING REGIONS - THE ORION HOT CORE AND COMPACT RIDGE [J].

CASELLI, P ;

HASEGAWA, TI ;

HERBST, E .

ASTROPHYSICAL JOURNAL, 1993, 408 (02) :548-558

[2]

CHARNLEY SB, 1992, APJ, V399, P71

[3]

Dartois E, 1999, ASTRON ASTROPHYS, V342, pL32

[4] THE STRUCTURE OF KNOTS IN VARIABLE STELLAR JETS .1. SYMMETRICAL KNOTS [J].

FALLE, SAEG ;

RAGA, AC .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1993, 261 (03) :573-583

[5]

Girart J. M., 1998, APJ, V495, P59

[6] AMMONIA DOWNSTREAM FROM HH-80-NORTH [J].

GIRART, JM ;

RODRIGUEZ, LF ;

ANGLADA, G ;

ESTALELLA, R ;

TORRELLES, JM ;

MARTI, J ;

PENA, M ;

AYALA, S ;

CURIEL, S ;

NORIEGACRESPO, A .

ASTROPHYSICAL JOURNAL, 1994, 435 (02) :L145-L148

[7]

Hatchell J, 1998, ASTRON ASTROPHYS, V338, P713

[8] Fractional abundances of molecules in dense interstellar clouds: A compendium of recent model results [J].

Lee, HH ;

Bettens, RPA ;

Herbst, E .

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1996, 119 (01) :111-114

[9] Chemical models of hot molecular cores [J].

Millar, TJ ;

Hatchell, J .

FARADAY DISCUSSIONS, 1998, 109 :15-30

[10] The UMIST database for astrochemistry 1995 [J].

Millar, TJ ;

Farquhar, PRA ;

Willacy, K .

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1997, 121 (01) :139-185

← 1 2 →