136 citations · 432 across the 19 of their papers we have counts for
14 papers · 1 filter
Molecules, shocks, and disk in the axi-symmetric wind of the MS-type AGB star RS Cancri
J. M. Winters, D. T. Hoai, K. T. Wong +6
The latest evolutionary phases of low- and intermediate mass stars are characterized by complex physical processes like turbulence, convection, stellar pulsations, magnetic fields,…
HI emission from the red giant Y CVn with the VLA and FAST
D. T. Hoai, P. T. Nhung, L. D. Matthews +2
Imaging studies with the VLA have revealed HI emission associated with the extended circumstellar shells of red giants. We analyse the spectral map obtained on Y CVn, a J-type carb…
Recurring OH Flares towards o Ceti: I. location and structure of the 1990s' and 2010s' events
S. Etoka, E. Gerard, A. M. S. Richards +3
We present the analysis of the onset of the new 2010s' OH flaring event detected in the OH ground-state main line at 1665~MHz towards o Ceti and compare its characteristics with th…
The axisymmetric envelopes of RS Cnc and EP Aqr
T. Le Bertre, D. T. Hoai, P. T. Nhung +1
We report on observations obtained at IRAM on two semi-regular variable Asymptotic Giant Branch (AGB) stars, RS Cnc and EP Aqr, undergoing mass loss at an intermediate rate of ~ 10…
CO and HI emission from the circumstellar envelopes of some evolved stars
P. N. Diep, D. T. Hoai, P. T. Nhung +7
Studies of the CO and HI radio emission of some evolved stars are presented using data collected by the IRAM Plateau de Bure interferometer and Pico Veleta telescope, the Nançay Ra…
12CO emission from EP Aqr: Another example of an axi-symmetric AGB wind?
P. T. Nhung, D. T. Hoai, J. M. Winters +6
The CO(1-0) and (2-1) emission of the circumstellar envelope of the AGB star EP Aqr has been observed using the IRAM PdBI and the IRAM 30-m telescope. The line profiles reveal the…
On the central symmetry of the circumstellar envelope of RS Cnc
Pham Tuyet Nhung, Do Thi Hoai, Jan Martin Winters +3
We present a phenomenological study of CO(1-0) and CO(2-1) emission from the circumstellar envelope (CSE) of the Asymptotic Giant Branch (AGB) star RS\,Cnc. It reveals departures f…
The multi-scale environment of RS Cnc from CO and HI observations
D. T. Hoai, L. D. Matthews, J. M. Winters +4
We present a detailed study of the circumstellar gas distribution and kinematics of the semi-regular variable star RS Cnc on spatial scales ranging from ~1" (~150 AU) to ~6' (~0.25…
An HI Imaging Survey of Asymptotic Giant Branch Stars
L. D. Matthews, T. Le Bertre, E. Gerard +1
We present an imaging study of a sample of eight asymptotic giant branch (AGB) stars in the HI 21-cm line. Using observations from the Very Large Array, we have unambiguously detec…
Discovery of a detached HI gas shell surrounding alpha Orionis
T. Le Bertre, L. D. Matthews, E. Gérard +1
We report the detection of the HI line at 21 cm in the direction of alpha Ori with the Nancay Radiotelescope and with the Very Large Array. The observations confirm the previous de…
An HI 21-cm line survey of evolved stars
E. Gerard, T. Le Bertre, Y. Libert
The HI line at 21 cm is a tracer of circumstellar matter around AGB stars, and especially of the matter located at large distances (0.1-1 pc) from the central stars. It can give un…
HI Observations of the Asymptotic Giant Branch Star X Herculis: Discovery of an Extended Circumstellar Wake Superposed on a Compact High-Velocity Cloud
L. D. Matthews, Y. Libert, E. Gerard +3
We report HI 21-cm line observations of the AGB star X Her obtained with the Green Bank Telescope (GBT) and the Very Large Array (VLA). We have detected HI emission totaling M_HI=2…
HI and CO in the circumstellar environment of the S-type star RS Cnc
Yannick Libert, Jan Martin Winters, Thibaut Le Bertre +2
This paper presents interferometric and single-dish CO observations along with HI data obtained for the oxygen-rich semi-regular variable RS Cnc, in order to probe its circumstella…
Circumstellar HI and CO around the carbon stars V1942 Sgr and V CrB
Y. Libert, E. Gerard, C. Thum +3
Context. The majority of stars that leave the main sequence are undergoing extensive mass loss, in particular during the asymptotic giant branch (AGB) phase of evolution. Observati…