2010A&A...521L...4D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST09:10:32

2010A&A...521L...4D - Astronomy and Astrophysics, volume 521, L4-4 (2010/10-1)

Water content and wind acceleration in the envelope around the oxygen-rich AGB star IK Tauri as seen by Herschel/HIFI.

DECIN L., JUSTTANONT K., DE BECK E., LOMBAERT R., DE KOTER A., WATERS L.B.F.M., MARSTON A.P., TEYSSIER D., SCHOEIER F.L., BUJARRABAL V., ALCOLEA J., CERNICHARO J., DOMINIK C., MELNICK G., MENTEN K., NEUFELD D.A., OLOFSSON H., PLANESAS P., SCHMIDT M., SZCZERBA R., DE GRAAUW T., HELMICH F., ROELFSEMA P., DIELEMAN P., MORRIS P., GALLEGO J.D., DIEZ-GONZALEZ M.C. and CAUX E.

Abstract (from CDS):

During their asymptotic giant branch evolution, low-mass stars lose a significant fraction of their mass through an intense wind, enriching the interstellar medium with products of nucleosynthesis. We observed the nearby oxygen-rich asymptotic giant branch star IK Tau using the high-resolution HIFI spectrometer onboard Herschel. We report on the first detection of H216O and the rarer isotopologues H217O and H218O in both the ortho and para states. We deduce a total water content (relative to molecular hydrogen) of 6.6x10–5, and an ortho-to-para ratio of 3:1. These results are consistent with the formation of H2O in thermodynamical chemical equilibrium at photospheric temperatures, and does not require pulsationally induced non-equilibrium chemistry, vaporization of icy bodies or grain surface reactions. High-excitation lines of 12CO, 13CO, 28SiO, 29SiO, 30SiO, HCN, and SO have also been detected. From the observed line widths, the acceleration region in the inner wind zone can be characterized, and we show that the wind acceleration is slower than hitherto anticipated.

Abstract Copyright:

Journal keyword(s): line: profiles - radiative transfer - instrumentation: spectrographs - stars: AGB and post-AGB - matter - submillimeter: stars circumstellar

Simbad objects: 3

goto Full paper

goto View the reference in ADS

Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* IK Tau Mi* 03 53 28.8884898148 +11 24 21.865959095 16.99 17.03 13.39 7.29 3.20 M7-11 570 0
2 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 598 0
3 * chi Cyg S* 19 50 33.9243904 +32 54 50.609683 7.02 6.06 4.24 1.81 -0.01 S6-9/1-2e 663 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2010A&A...521L...4D and select 'bookmark this link' or equivalent in the popup menu


2020.07.05-09:10:32

© Université de Strasbourg/CNRS

    • Contact