A spectral atlas of post-main-sequence stars in ω Centauri: kinematics, evolution, enrichment and interstellar medium

  title={A spectral atlas of post-main-sequence stars in $\omega$ Centauri: kinematics, evolution, enrichment and interstellar medium},
  author={Jacco Th. van Loon and Floor van Leeuwen and Barry Smalley and Andrew W. Smith and N. Lyons and Iain McDonald and Martha L. Boyer},
  journal={Monthly Notices of the Royal Astronomical Society},
We present a spectral atlas of the post-main-sequence population of the most massive Galactic globular cluster, ω Centauri. Spectra were obtained of more than 1500 stars selected as uniformly as possible from across the (B, B − V) colour‐magnitude diagram of the proper motion cluster member candidates of van Leeuwen et al. The spectra were obtained with the 2dF multifibre spectrograph at the Anglo-Australian Telescope, and cover the approximate range λ ∼ 3840‐4940 A at a resolving power of… 
Detailed maps of interstellar clouds in front of ω Centauri: small‐scale structures in the Galactic disc–halo interface
The multiphase interstellar medium (ISM) is highly structured, on scales from the size of the Solar System to that of a galaxy. In particular, small-scale structures are difficult to Study and hence
A Spectroscopic Survey for ω Centauri Members at and beyond the Cluster Tidal Radius
We have used the two-degree field (2dF) multi-fiber spectrograph of the Anglo-Australian Telescope (AAT) to search for candidate members of the unusual globular cluster ω Centauri at and beyond the
Modelling chromospheric line profiles as diagnostics of velocity fields in ω Centauri red giant stars
Context. Mass loss of ∼0.1−0.3 Mfrom Population II red giant stars (RGB) is a requirement of stellar evolution theory in order to account for several observational evidences in globular clusters.
Giants in the globular cluster ω Centauri: dust production, mass-loss and distance
We present spectral energy distribution modelling of 6875 stars in ω Centauri, obtaining stellar luminosities and temperatures by fitting literature photometry to state-of-the-art MARCS stellar
Multiple populations in ω Centauri: a cluster analysis of spectroscopic data
ω Centauri, the largest globular cluster of the Milky Way, is composed of several stellar populations, which can be seen in both photometry and spectroscopy. The history of how these different
A Spitzer Space Telescope atlas of ω Centauri: The stellar population, mass loss, and the intracluster medium
We present a Spitzer Space Telescope imaging survey of the most massive Galactic globular cluster, ω Centauri, and investigate stellar mass loss at low metallicity and the intracluster medium (ICM).
Fundamental parameters and time evolution of mass loss are investigated for post-main-sequence stars in the Galactic globular cluster 47 Tucanae (NGC 104). This is accomplished by fitting spectral
From the CMD of Omega Centauri and (super-)AGB stellar models to a Galactic plane passage gas purging chemical evolution scenario
We have investigated the color-magnitude diagram of ! Centauri and nd that the blue main sequence (bMS) can be reproduced only by models that have a of helium abundance in the range Y = 0:35{0:40. To
Spectral matching for abundances and clustering analysis of stars on the giant branches of ω Centauri
We have determined stellar parameters and abundances for 221 giant branch stars in the globular cluster ω Centauri. A combination of photometry and lower resolution spectroscopy was used to determine
We present abundances of several light, α, Fe-peak, and neutron-capture elements for 66 red giant branch (RGB) stars in the Galactic globular cluster Omega Centauri (ω Cen). Our observations lie in


Medium resolution spectroscopy in ω Centauri : abundances of 400 subgiant and turn-off region stars
Medium resolution spectra of more than 400 subgiant and turn-off region stars in ω Centauri were analysed. The observations were performed at the VLT/Paranal with FORS2/MXU. In order to determine the
Metallicities, Relative Ages, and Kinematics of Stellar Populations in ω Centauri*
We present results of an extensive spectroscopic survey of subgiant stars in the stellar system ω Cen. Using infrared Ca II triplet lines, we derived metallicities and radial velocities for more than
The Chemical Evolution of the Globular Cluster ω Centauri (NGC 5139)
We present abundances for 22 chemical elements in 10 red giant members of the massive Galactic globular cluster ω Centauri. The spectra are of relatively high spectral resolution and signal-to-noise.
A Pulsational Distance to ω Centauri Based on Near-Infrared Period-Luminosity Relations of RR Lyrae Stars
We present new near-infrared (J and K) magnitudes for 114 RR Lyrae stars in the globular cluster ω Centauri (NGC 5139), which we combine with data from the literature to construct a sample of 180 RR
A Near-Infrared Spectroscopic Screening of the Red Giant Populations in ω Centauri*
Near-infrared spectra of 21 giants in ω Cen spanning the whole range of metallicities observed in this cluster are presented. This work is part of a coordinated photometric and spectroscopic campaign
Discovery of an Accreted Stellar System within the Globular Cluster ω Centauri
Recent wide-field photometric surveys (Lee et al.; Pancino et al.) have shown the existence of a previously unknown metal-rich ([Fe/H] -0.6) stellar population in the galactic globular cluster ω
The multiplicity of the subgiant branch of ω centauri : Evidence for prolonged star formation
We combine spectroscopic and photometric data for subgiant stars of ω Cen to extract results that neither data set could have provided on its own. GIRAFFE@VLT spectra of 80 stars at R = 6400 give
The Giant Branch of ω Centauri: The Dependence of Kinematics on Abundance
For a sample of some 400 red giants in the chemically inhomogeneous globular cluster ω Centauri, we report correlations between the radial velocities of Mayor et al., which are accurate to 1 km s-1,
Super-Helium-rich Populations and the Origin of Extreme Horizontal-Branch Stars in Globular Clusters
Recent observations for the color-magnitude diagrams (CMDs) of the massive globular cluster ω Centauri have shown that it has a striking double main sequence (MS), with a minority population of bluer
Radial velocities in the globular cluster ω Centauri
We have used the ARGUS multi-object spectrometer at the CTIO 4 m Blanco telescope to obtain 2756 radial velocity measurements for 1966 individual stars in the globular cluster ω  Centauri brighter