1998A&A...330L..17J


Query : 1998A&A...330L..17J

1998A&A...330L..17J - Astronomy and Astrophysics, volume 330, L17-20 (1998/2-1)

Discovery of CO2 emission in AGB stars with the 13µm dust feature.

JUSTTANONT K., FEUCHTGRUBER H., DE JONG T., CAMI J., WATERS L.B.F.M., YAMAMURA I. and ONAKA T.

Abstract (from CDS):

We have detected strong emission lines at 13.48, 13.87, 14.97, 15.40 and 16.28µm in the ISO/SWS spectra of O-rich AGB stars. These lines are only found in the spectra of Miras and semi-regular variables when they also show the 13µm dust emission feature. The lines appear just resolved in the high-resolution (AOT06, resolution ∼1500) SWS spectra that we recently obtained. Here we report the identification of these emission lines as the Q-branches of ro-vibrational transitions in CO2 molecules. This identification is corroborated by our SWS Fabry-Perot observation of the 13.87µm line in W Hya where individual Q-branch components of the 1000{SIGMA}+g - 0110{PI}u transition of CO2 have been detected. The 15.40µm line is probably due to 13CO2. We speculate that the simultaneous occurence of the 13µm dust feature and the CO2 emission lines indicates the existence of a warm (∼650-1250K) gas layer close to the star where both the 13µm dust and the CO2 emission lines are formed.

Abstract Copyright:

Journal keyword(s): line: identification - stars: AGB and post-AGB - stars: circumstellar matter - stars: late-type - stars: mass loss - infrared: stars

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* R Hya Mi* 13 29 42.7818674 -23 16 52.774679 7.26 6.58 4.97 2.27 -0.15 M6-9e 471 0
2 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 622 0
3 V* R Cen Mi* 14 16 34.3193427192 -59 54 49.294904112   9.65 7.55 4.45 1.37 M4-6e 132 0
4 V* RX Boo AB* 14 24 11.6253191184 +25 42 13.394221596   9.23 8.60     M7.5-M8 431 0
5 V* EP Aqr AB* 21 46 31.8494911920 -02 12 45.928582560   7.93 6.78     M7-III: 229 0
6 V* R Cas Mi* 23 58 24.8682785040 +51 23 19.713029388 6.71 6.63 4.80     M6.5-9e 690 0

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2022.05.23-11:14:01

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