ISO LWS Observations of H2O from R Cas: A Consistent Model For Its Circumstellar Envelope

被引：0
|
作者：
R.J. Truong-Bach
M.J. Nguyen-Q-Rieu
X.W. Sylvester
T. Barlow
A. Liu
P. Lim
C.J. Omont
机构：
[1] Observatoire de Paris,Department of Physics & Astronomy
[2] DEMIRM,Institut d'Astrophysique Spatiale
[3] University College London,undefined
[4] The LWS Instrument-Dedicated Team,undefined
[5] ISO Science Operations Center,undefined
[6] Institut d'Astrophysique,undefined
[7] Universite Paris XI,undefined
[8] Space Telescope Science Institute,undefined
来源：
Astrophysics and Space Science | 1997年 / 255卷 / 1-2期
关键词：
Physical Parameter; Photodissociation; Radiative Transfer; Cool Process; Consistent Manner;
D O I：
10.1023/A:1001539824590
中图分类号：
学科分类号：
摘要：
We present an ISO LWS 43-197 µm grating spectrum of the oxygen-rich AGB star R Cas. The spectrum is rich of isolated and blended H2O lines. For their identification and in order to determine the physical parameters of the circumstellar envelope, we have constructed a model which treats radiative transfer, chemical exchange and photodissociation reactions, and various heating and cooling processes in a consistent manner. By fitting the observed line fluxes and using stellar parameters based upon the Hipparcos distance, we derived a mass-loss rate of M = 1 10-6 M⊙ yr-1 which is close to the value 6 10-7 M⊙ yr-1 previously derived for W Hya, another oxygen-rich AGB star.
引用
收藏
页码：325 / 328
页数：3
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