2010A&A...518L.143D


Query : 2010A&A...518L.143D

2010A&A...518L.143D - Astronomy and Astrophysics, volume 518, L143-143 (2010/7-2)

Silicon in the dust formation zone of IRC +10216.

DECIN L., CERNICHARO J., BARLOW M.J., ROYER P., VANDENBUSSCHE B., WESSON R., POLEHAMPTON E.T., DE BECK E., AGUNDEZ M., BLOMMAERT J.A.D.L., COHEN M., DANIEL F., DE MEESTER W., EXTER K., FEUCHTGRUBER H., FONFRIA J.P., GEAR W.K., GOICOECHEA J.R., GOMEZ H.L., GROENEWEGEN M.A.T., HARGRAVE P.C., HUYGEN R., IMHOF P., IVISON R.J., JEAN C., KERSCHBAUM F., LEEKS S.J., LIM T., MATSUURA M., OLOFSSON G., POSCH T., REGIBO S., SAVINI G., SIBTHORPE B., SWINYARD B.M., TERCERO B., WAELKENS C., WITHERICK D.K. and YATES J.A.

Abstract (from CDS):

The interstellar medium is enriched primarily by matter ejected from evolved low and intermediate mass stars. The outflows from these stars create a circumstellar envelope in which a rich gas-phase and dust-nucleation chemistry takes place. We observed the nearest carbon-rich evolved star, IRC+10216, using the PACS (55-210µm) and SPIRE (194-672µm) spectrometers on board Herschel. We find several tens of lines from SiS and SiO, including lines from the v=1 vibrational level. For SiS these transitions range up to J=124-123, corresponding to energies around 6700K, while the highest detectable transition is J=90-89 for SiO, which corresponds to an energy around 8400K. Both species trace the dust formation zone of IRC+10216, and the broad energy ranges involved in their detected transitions permit us to derive the physical properties of the gas and the particular zone in which each species has been formed. This allows us to check the accuracy of chemical thermodynamical equilibrium models and the suggested depletion of SiS and SiO due to accretion onto dust grains.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - stars: AGB and post-AGB - stars: carbon - circumstellar matter - stars: mass-loss - stars: individual: IRC+10216

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* VY CMa s*r 07 22 58.3261352189 -25 46 03.194390594 12.01 10.068 8.691 7.938   M5Iae 1070 0
2 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2275 0

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2023.01.30-23:27:56

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