Solid-state CO toward ρ Ophiuchi Elias 25:: Ice thresholds revisited

被引：13

作者：

Shuping, RY

Snow, TP

Chiar, JE

Kerr, T

机构：

[1] Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80309 USA

[2] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[3] Joint Astron Ctr, Hilo, HI 96720 USA

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 529卷 / 02期

关键词：

infrared : ISM : lines and bands; ISM : abundances; ISM : clouds; ISM : individual (Ophiuchus Cloud); ISM : molecules;

D O I：

10.1086/308324

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper we report the detection of CO ice at 4.67 mu m toward Elias 25 in the rho Ophiuchi cloud. The data were obtained using the UKIRT CGS4, and the CO-ice band is among the weakest yet observed. We compare our result to previous CO and H(2)O ice detections in an effort to understand the extinction thresholds for ice growth (A(th)). Our data imply A(th) < 11 magnitudes for CO ices in rho Oph, much less than previously thought. We tentatively suggest that the OB star lines of sight reflect ice growth trends for pristine molecular cloud material not associated with star formation.

引用

页码：932 / 935

页数：4

共 30 条

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