2017A&A...605A.116K


Query : 2017A&A...605A.116K

2017A&A...605A.116K - Astronomy and Astrophysics, volume 605A, 116-116 (2017/9-1)

Rings and filaments: The remarkable detached CO shell of U Antliae.

KERSCHBAUM F., MAERCKER M., BRUNNER M., LINDQVIST M., OLOFSSON H., MECINA M., DE BECK E., GROENEWEGEN M.A.T., LAGADEC E., MOHAMED S., PALADINI C., RAMSTEDT S., VLEMMINGS W.H.T. and WITTKOWSKI M.

Abstract (from CDS):

Aims. Our goal is to characterize the intermediate age, detached shell carbon star U Antliae morphologically and physically in order to study the mass-loss evolution after a possible thermal pulse.
Methods. High spatial resolution ALMA observations of unprecedented quality in thermal CO lines allow us to derive first critical spatial and temporal scales and constrain modeling efforts to estimate mass-loss rates for both the present day as well as the ejection period of the detached shell.
Results. The detached shell is remarkably thin, overall spherically symmetric, and shows a barely resolved filamentary substructure possibly caused by instabilities in the interaction zone of winds with different outflow velocities. The expansion age of the detached shell is of the order of 2700yr and its overall width indicates a high expansion-velocity and high mass-loss period of only a few hundred years at an average mass-loss rate of ~=10–5M/yr. The post-high-mass-loss-rate-epoch evolution of U Ant shows a significant decline to a substantially lower gas expansion velocity and a mass-loss rate amounting to 4x10–8M/yr, at present being consistent with evolutionary changes as predicted for the period between thermal pulses.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: AGB and post-AGB - stars: carbon - stars: evolution - stars: mass-loss - stars: mass-loss

VizieR on-line data: <Available at CDS (J/A+A/605/A116): list.dat fits/*>

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* R Scl C* 01 26 58.0946233986 -32 32 35.437732667 17.26 9.59 5.72 3.69 2.30 C-N5+ 307 0
2 V* U Cam C* 03 41 48.1762532767 +62 38 54.397016016   11.5 11.00     C-N5 236 0
3 V* U Ant C* 10 35 12.8508908507 -39 33 45.320533564 15.32 8.22 5.38 3.18 1.86 C-N3 140 0
4 2MASS J10424438-4143254 QSO 10 42 44.3996872309 -41 43 25.746824060   18.82   17.54   ~ 16 0
5 QSO B1104-445 QSO 11 07 08.6939954176 -44 49 07.617187122   17.84 18.2 17.37   ~ 206 1
6 V* S Sct C* 18 50 20.0367524071 -07 54 27.430964220 13.93 9.89 6.80     C-N5 199 0
7 V* TT Cyg C* 19 40 57.0159854799 +32 37 05.755486755   10.43 10.20     C-N5- 193 0

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2021.10.16-17:38:40

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