2001A&A...366..229H


Query : 2001A&A...366..229H

2001A&A...366..229H - Astronomy and Astrophysics, volume 366, 229-240 (2001/1-4)

Circumstellar dust shells around long-period variables. IX. Molecular layers resulting from shocked carbon-rich atmospheres.

HELLING C. and WINTERS J.M.

Abstract (from CDS):

The existence of warm zones of an enhanced molecular content surrounding the photospheres of AGB stars has been postulated to explain observed molecular absorption/emission components which are in excess of the results obtained from classical hydrostatic model atmospheres. We have analyzed the chemical equilibrium molecular composition of time-dependent models of carbon-rich circumstellar envelopes for various combinations of the stellar parameters and found that groups of molecules appear to be present in different zones with temporally varying temperature and density. The regions of enhanced molecular abundances are situated between the stellar photosphere and the circumstellar dust shell. In the models, these zones are produced by the levitation of the atmospheric gas due to the dissipation of shock waves and/or due to radiation pressure on molecules and dust.

Abstract Copyright:

Journal keyword(s): infrared: stars - molecular processes - hydrodynamics - stars: late type - circumstellar matter

Errata: Erratum vol.370, p.555 (2001)

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2201 0
2 V* TT Cyg C* 19 40 57.0159854799 +32 37 05.755486755   10.43 10.20     C-N5- 192 0
3 V* V460 Cyg C* 21 42 01.0831986858 +35 30 36.713658662 12.97 8.32 5.84 4.10 2.71 C-N5 203 1
4 * 19 Psc C* 23 46 23.5126056542 +03 29 12.505415198 10.95 7.62 5.02 3.19 1.82 C-N6 435 0

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2021.08.01-12:35:16

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