111 citations · 1.1k across the 28 of their papers we have counts for
25 papers · 1 filter
MELCHIORS: The Mercator Library of High Resolution Stellar Spectroscopy
P. Royer, T. Merle, K. Dsilva +71
Over the past decades, libraries of stellar spectra have been used in a large variety of science cases, including as sources of reference spectra for a given object or a given spec…
PACS and SPIRE range spectroscopy of cool, evolved stars
Dries Nicolaes, M. A. T. Groenewegen, P. Royer +3
Context: At the end of their lives AGB stars are prolific producers of dust and gas. The details of this mass-loss process are still not understood very well. Herschel PACS and SPI…
Chemical content of the circumstellar envelope of the oxygen-rich AGB star R Dor: Non-LTE abundance analysis of CO, SiO, and HCN
M. Van de Sande, L. Decin, R. Lombaert +5
(abridged) Our aim is to determine the radial abundance profile of SiO and HCN throughout the stellar outflow of R Dor, an oxygen-rich AGB star with a low mass-loss rate. We have a…
Water isotopologues in the circumstellar envelopes of M-type AGB stars
Taïssa Danilovich, R. Lombaert, L. Decin +3
AIM: In this study we examine rotational emission lines of two isotopologues of water: HO and HO. By determining the abundances of these molecules, we aim to…
ALMA observations of the vibrationally-excited rotational CO transition towards five AGB stars
T. Khouri, W. H. T. Vlemmings, S. Ramstedt +3
We report the serendipitous detection with ALMA of the vibrationally-excited pure-rotational CO transition towards five asymptotic giant branch (AGB) stars, Cet, R…
Nucleosynthesis in AGB stars traced by oxygen isotopic ratios. I - Determining the stellar initial mass by means of the O/O ratio
R. De Nutte, L. Decin, H. Olofsson +8
The aim of this paper is to investigate the O/O ratio for a sample of AGB stars, containing M-, S- and C-type stars. These ratios are evaluated in relation to fundame…
A HIFI view on circumstellar H2O in M-type AGB stars: radiative transfer, velocity profiles, and H2O line cooling
M. Maercker, T. Danilovich, H. Olofsson +4
We aim to constrain the temperature and velocity structures, and H2O abundances in the winds of a sample of M-type AGB stars. We further aim to determine the effect of H2O line coo…
H2O vapor excitation in dusty AGB envelopes. A PACS view of OH 127.8+0.0
R. Lombaert, L. Decin, A. de Koter +6
Context: AGB stars lose a large percentage of their mass in a dust-driven wind. This creates a circumstellar envelope, which can be studied through thermal dust emission and molecu…
Simplified models of stellar wind anatomy for interpreting high-resolution data: Analytical approach to embedded spiral geometries
Ward Homan, Leen Decin, Alex de Koter +3
Recent high-resolution observations have shown stellar winds to harbour complexities which strongly deviate from spherical symmetry, generally assumed as standard wind model. One s…
Micron-sized forsterite grains in the pre-planetary nebula of IRAS 17150-3224 - Searching for clues on the mysterious evolution of massive AGB stars
B. L. de Vries, K. M. Maaskant, M. Min +3
We study the grain properties and location of the forsterite crystals in the circumstellar environment of the pre-planetary nebula (PPN) IRAS 17150-3224 in order to learn more abou…
ALMA data suggest the presence of a spiral structure in the inner wind of CW Leo
L. Decin, A. M. S. Richards, D. Neufeld +3
(abbreviated) We aim to study the inner wind of the well-known AGB star CW Leo. Different diagnostics probing different geometrical scales have pointed toward a non-homogeneous mas…
The wind of W Hya as seen by Herschel. II. The molecular envelope of W Hya
T. Khouri, A. de Koter, L. Decin +18
The evolution of low- and intermediate-mass stars on the asymptotic giant branch (AGB) is mainly controlled by the rate at which these stars lose mass in a stellar wind. Understand…
Detailed modelling of the circumstellar molecular line emission of the S-type AGB star W Aquilae
T. Danilovich, P. Bergman, K. Justtanont +5
S-type AGB stars have a C/O ratio which suggests that they are transition objects between oxygen-rich M-type stars and carbon-rich C-type stars. As such, their circumstellar compos…
The wind of W Hya as seen by Herschel - I. The CO envelope
T. Khouri, A. de Koter, L. Decin +25
Asymptotic giant branch (AGB) stars lose their envelopes by means of a stellar wind whose driving mechanism is not understood well. Characterizing the composition and thermal and d…
KIC 11285625: a double-lined spectroscopic binary with a gamma Dor pulsator discovered from Kepler space photometry
J. Debosscher, C. Aerts, A. Tkachenko +8
We present the first binary modelling results for the pulsating eclipsing binary KIC 11285625, discovered by the Kepler mission. An automated method to disentangle the pulsation sp…
Detection of a large sample of Gamma Dor stars from Kepler space photometry and high-resolution ground-based spectroscopy
A. Tkachenko, C. Aerts, A. Yakushechkin +10
The space-missions MOST, CoRoT, and Kepler deliver a huge amount of high-quality photometric data suitable to study numerous pulsating stars. Our ultimate goal is a detection and a…
The orbits of subdwarf B + main-sequence binaries. I: The sdB+G0 system PG 1104+243
J. Vos, R. H. Östensen, P. Degroote +18
The predicted orbital period histogram of an sdB population is bimodal with a peak at short (< 10 days) and long (> 250 days) periods. Observationally, there are many short-period…
Observational evidence for composite grains in an AGB outflow: MgS in the extreme carbon star LL Peg
R. Lombaert, B. L. de Vries, A. de Koter +5
The broad 30 μm feature in carbon stars is commonly attributed to MgS dust particles. However, reproducing the 30 μm feature with homogeneous MgS grains would require much more sul…
Detection of gravity modes in the massive binary V380 Cyg from Kepler spacebased photometry and high-resolution spectroscopy
A. Tkachenko, C. Aerts, K. Pavlovski +17
We report the discovery of low-amplitude gravity-mode oscillations in the massive binary star V380 Cyg, from 180 d of Kepler custom-aperture space photometry and 5 months of high-r…
The CoRoT B-type binary HD50230: a prototypical hybrid pulsator with g-mode period and p-mode frequency spacings
P. Degroote, C. Aerts, E. Michel +14
B-type stars are promising targets for asteroseismic modelling, since their frequency spectrum is relatively simple. We deduce and summarise observational constraints for the hybri…
Mass ratio from Doppler beaming and Rømer delay versus ellipsoidal modulation in the Kepler data of KOI-74
S. Bloemen, T. R. Marsh, P. Degroote +18
We present a light curve analysis and radial velocity study of KOI-74, an eclipsing A star + white dwarf binary with a 5.2 day orbit. Aside from new spectroscopy covering the orbit…
On the physical structure of IRC+10216. Ground-based and Herschel observations of CO and CCH
E. De Beck, R. Lombaert, M. Agúndez +17
The C-rich AGB star IRC+10216 undergoes strong mass loss, and quasi-periodic density enhancements in the circumstellar matter have been reported. CO is ubiquitous in the CSE, while…
Warm water vapour in the sooty outflow from a luminous carbon star
L. Decin, M. Agundez, M. J. Barlow +34
In 2001, the discovery of circumstellar water vapour around the ageing carbon star IRC+10216 was announced. This detection challenged the current understanding of chemistry in old…
PACS spectroscopy of OH/IR stars
R. Lombaert, B. L. de Vries, L. Decin +5
Observations of high-excitation molecular emission lines can greatly increase our understanding of AGB winds, as they trace the innermost regions of the circumstellar envelope. The…