|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
27 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
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
; R. Szczerba
; M. Schmidt
; L. Decin
; J. Alcolea
; A. de Koter
; F. L. Schöier
; V. Bujarrabal
; J. Cernicharo
; C. Dominik
; K. Justtanont
; A. P. Marston
; K. Menten
; H. Olofsson
; P. Planesas
; D. Teyssier
; L. B. F. M. Waters
; | | Date: |
15 Dec 2010 | | Abstract: | 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, S Cep, and IRC+40540. This survey, performed using
the HIFI instrument on board the Herschel Space Observatory, entailed
observations of the lowest transitions of both ortho- and para-water: the
556.936 GHz 1(10)-1(01) and 1113.343 GHz 1(11)-0(00) transitions, respectively.
Water vapor was unequivocally detected in all eight of the target stars. Prior
to this survey, IRC+10216 was the only carbon-rich AGB star from which thermal
water emissions had been discovered, in that case with the use of the
Submillimeter Wave Astronomy Satellite (SWAS). Our results indicate that
IRC+10216 is not unusual, except insofar as its proximity to Earth leads to a
large line flux that was detectable with SWAS. The water spectral line widths
are typically similar to those of CO rotational lines, arguing against the
vaporization of a Kuiper belt analog (Ford & Neufeld 2001) being the general
explanation for water vapor in carbon-rich AGB stars. There is no apparent
correlation between the ratio of the integrated water line fluxes to the 6.3
micron continuum flux - a ratio which measures the water outflow rate - and the
total mass-loss rate for the stars in our sample. | | Source: | arXiv, 1012.3456 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER