2018A&A...616L...3B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:58:40

2018A&A...616L...3B - Astronomy and Astrophysics, volume 616, L3-3 (2018/8-1)

High-resolution observations of the symbiotic system R Aqr. Direct imaging of the gravitational effects of the secondary on the stellar wind.

BUJARRABAL V., ALCOLEA J., MIKOLAJEWSKA J., CASTRO-CARRIZO A. and RAMSTEDT S.

Abstract (from CDS):

We have observed the symbiotic stellar system R Aqr, aiming to describe the gravitational interaction between the white dwarf (WD) and the wind from the Mira star, the key phenomenon driving the symbiotic activity and the formation of nebulae in such systems. We present high-resolution ALMA maps of the 12CO and 13CO J=3-2 lines, the 0.9mm continuum distribution, and some high-excitation molecular lines in R Aqr. The maps, which have resolutions ranging between 40mas and less than 20mas probe the circumstellar regions at suborbital scales as the distance between the stars is ∼40mas. Our observations show the gravitational effects of the secondary on the stellar wind. The AGB star was identified in our maps from the continuum and molecular line data, and we estimated the probable position of the secondary from a new estimation of the orbital parameters. The (preliminary) comparison of our maps with theoretical predictions is surprisingly satisfactory and the main expected gravitational effects are directly mapped for the first time. We find a strong focusing in the equatorial plane of the resulting wind, which shows two plumes in opposite directions that have different velocities and very probably correspond to the expected double spiral due to the interaction. Our continuum maps show the very inner regions of the nascent bipolar jets, at scales of some AU. Continuum maps obtained with the highest resolution show the presence of a clump that very probably corresponds to the emission of the ionized surroundings of the WD and of a bridge of material joining both stars, which is likely material flowing from the AGB primary to the accretion disk around the WD secondary.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: AGB and post-AGB - circumstellar matter - binaries: close - binaries: symbiotic - stars: individual: R Aqr

Errata: erratum vol. 633, art. C1 (2020)

Simbad objects: 3

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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 QSO B0003-066 BLL 00 06 13.89288849 -06 23 35.3353162   19.1   17.14   ~ 263 1
2 V* R Aqr Sy* 23 43 49.4629939776 -15 17 04.184232557   8.823 7.683 9.37   M6.5-8.5e 736 0
3 QSO B2345-167 QSO 23 48 02.60852518 -16 31 12.0222445   18.00 18.41 16.86   ~ 360 1

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:58:40

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