Search Publications
Is helium the key parameter in the extended colour spread of the first generation stars in M3?
Milone, A. P.; Cordoni, G.; Marino, A. F. +4 more
The study of the `chromosome maps' of Galactic globular clusters has shown that the stars identified as `first generation' often define an extended sequence in the mF275W - mF814W colour, whose straightforward interpretation, by comparison with synthetic spectra, is that they are inhomogeneous in helium content. The cluster M…
Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies
Mernier, F.; Werner, N.; Lakhchaura, K.
We present azimuthally averaged metal abundance profiles from a full, comprehensive, and conservative re-analysis of the deep (∼800 ks total net exposure) Chandra/ACIS-S observation of the Centaurus cluster core (NGC 4696). After carefully checking various sources of systematic uncertainties, including the choice of the spectral deprojection metho…
Impacts of EUV Wavefronts on Coronal Structures in Homologous Coronal Mass Ejections
Wang, Yuming; Shen, Chenglong; Liu, Rui +1 more
Large-scale propagating fronts are frequently observed during solar eruptions, yet whether or not they are waves is an open question, partly because the propagation is modulated by coronal structures, whose magnetic fields we still cannot measure. However, when a front impacts coronal structures, an opportunity arises for us to look into the magne…
The time delay between star formation quenching and morphological transformation of galaxies in clusters: a phase-space view of EDisCS
Moustakas, John; Aragón-Salamanca, Alfonso; Milvang-Jensen, Bo +5 more
We explore the possible effect of cluster environments on the structure and star formation histories of galaxies by analysing the projected phase-space (PPS) of intermediate-redshift clusters (0.4 ≤ z ≤ 0.8). HST I-band imaging data from the ESO Distant Cluster Survey (EDisCS) allow us to measure deviations of the galaxies' light distributions fro…
The Wolf–Rayet Content of the Galaxies of the Local Group and Beyond
Massey, Philip; Neugent, Kathryn
Wolf–Rayet stars (WRs) represent the end of a massive star's life as it is about to turn into a supernova. Obtaining complete samples of such stars across a large range of metallicities poses observational challenges, but presents us with an exacting way to test current stellar evolutionary theories. A technique we have developed and refined invol…
Spectroscopic Orbits of Subsystems in Multiple Stars. VI.
Tokovinin, Andrei
Thirteen spectroscopic orbits of late-type stars are determined from the high-resolution spectra taken with the CHIRON echelle spectrometer at the 1.5 m Cerro Tololo Inter-American Observatory telescope. Most (HIP 14194B, 40523A, 41171A, 51578A, 57572B, 59426A, 62852B, 66438A, 87813B, and 101472A) are inner subsystems in hierarchical multiple star…
The Geology and Astrobiology of McLaughlin Crater, Mars: An Ancient Lacustrine Basin Containing Turbidites, Mudstones, and Serpentinites
Michalski, Joseph R.; Glotch, T. D.; Rogers, A. Deanne +4 more
McLaughlin crater is a 92-km diameter complex crater that formed on Mars 4 billion years ago. The resulting basin was the site of a large ( 3,000 km2), deep ( 500 m), voluminous ( 1,500 km3) Martian lake circa 3.8 Ga. While there is strong evidence that hundreds of lakes have existed on Mars at some point during the same time…
A multiwavelength analysis of a collection of short-duration GRBs observed between 2012 and 2015
Cepa, J.; Troja, E.; Lee, W. H. +71 more
We investigate the prompt emission and the afterglow properties of short-duration gamma-ray burst (sGRB) 130603B and another eight sGRB events during 2012-2015, observed by several multiwavelength facilities including the Gran Canarias Telescope 10.4 m telescope. Prompt emission high energy data of the events were obtained by INTEGRAL-SPI-ACS, Swi…
Aerothermal Measurements from the ExoMars Schiaparelli Capsule Entry
Gülhan, A.; Thiele, T.; Siebe, F. +2 more
High-resolution Near-infrared Spectroscopy of HD 100546. IV. Orbiting Companion Disappears on Schedule
Najita, Joan R.; Brittain, Sean D.; Carr, John S.
HD 100546 is a Herbig Ae/Be star surrounded by a disk with a large central region that is cleared of gas and dust (i.e., an inner hole). High-resolution near-infrared spectroscopy reveals a rich emission spectrum of fundamental rovibrational CO emission lines whose time variable properties point to the presence of an orbiting companion within the …