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The widespread occurence of water vapor in the circumstellar envelopes of carbon-rich AGB stars: first results from a survey with Herschel/HIFI
D. A. Neufeld, E. González-Alfonso, G. Melnick +16
We report the preliminary results of a survey for water vapor in a sample of eight C stars with large mid-IR continuum fluxes: V384 Per, CIT 6, V Hya, Y CVn, IRAS 15194-5115, V Cyg…
Herschel/HIFI observations of IRC+10216: water vapor in the inner envelope of a carbon-rich AGB star
David A. Neufeld, Eduardo González-Alfonso, Gary J. Melnick +6
We report the results of observations of ten rotational transitions of water vapor toward the carbon-rich AGB (asymptotic giant branch) star IRC+10216 (CW Leonis), carried out with…
Are the Stellar Winds in IC1613 stronger than expected?
A. Herrero, M. Garcia, K. Uytterhoeven +8
In this poster we present the results of our analyses of three early massive stars in IC 1613, whose spectra have been observed with VIMOS and analyzed with CMFGEN and FASTWIND. On…
A high resolution line survey of IRC+10216 with Herschel. First results: Detection of warm silicon dicarbide SiC2
J. Cernicharo, L. B. F. M. Waters, L. Decin +24
We present the first results of a high-spectral-resolution survey of the carbon-rich evolved star IRC+10216 that was carried out with the HIFI spectrometer onboard Herschel. This s…
Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles - II. CO line survey of evolved stars: derivation of mass-loss rate formulae
E. De Beck, L. Decin, A. de Koter +4
We aim to (1) set up simple and general analytical expressions to estimate mass-loss rates of evolved stars, and (2) from those calculate estimates for the mass-loss rates of asymp…
Herschel/HIFI deepens the circumstellar NH3 enigma
K. M. Menten, F. Wyrowski, J. Alcolea +23
Circumstellar envelopes (CSEs) of a variety of evolved stars have been found to contain ammonia (NH3) in amounts that exceed predictions from conventional chemical models by many o…