Search Publications
On the role of dust and mass-loss in the extended main sequence turnoff of star clusters: the case of NGC 1783
Milone, A. P.; Cordoni, G.; Marino, A. F. +6 more
The colour-magnitude diagram (CMD) morphology of the 'extended' main sequence turnoff (eMSTO) and upper main sequence (MS) of the intermediate age (≲ 2 Gyr) Large Magellanic Cloud Cluster NGC 1783 shows the presence of a small group of UV-dim stars, that, in the ultraviolet Hubble Space Telescope filters, are located at colours on the red side of …
The Pristine survey - XIX. Cu and Zn abundances in metal-poor giants
Salvadori, S.; Bonifacio, P.; Caffau, E. +14 more
Metal-poor stars formed from a gas enriched by the ejecta of the explosion of one/few generations of first massive stars. With the Pristine photometry combined with the Gaia data, we selected a sample of bright giants metal-poor candidates to be observed at high resolution. Of the 43 stars observed, 36 were confirmed to be metal-poor, supporting t…
Deciphering the unusual stellar progenitor of GRB 210704A
Troja, E.; Im, M.; Butler, N. R. +16 more
GRB 210704A is a burst of intermediate duration (T90 ~ 1-4 s) followed by a fading afterglow and an optical excess that peaked about 7 d after the explosion. Its properties, and in particular those of the excess, do not easily fit into the well-established classification scheme of gamma-ray bursts (GRBs) as being long or short, leaving …
Testing multiband (G, GBP, GRP, B, V, and TESS) standard bolometric corrections by recovering luminosity and radii of 341 host stars
Bakış, V.; Eker, Z.
Main-sequence bolometric corrections (BC) and a standard BC-Teff relation are produced for TESS wavelengths using published physical parameters and light ratios from SED models of 209 detached double-lined eclipsing binaries. This and previous five-band (Johnson B, V, Gaia G, GBP, GRP) standard BC-Teff r…
The white dwarf binary pathways survey - IX. Three long period white dwarf plus subgiant binaries
Gänsicke, B. T.; Koester, D.; Rebassa-Mansergas, A. +8 more
Virtually all binaries consisting of a white dwarf with a non-degenerate companion can be classified as either close post-interaction systems (with orbital periods of a few days or less), or wide systems (with periods longer than decades), in which both components have effectively evolved as single stars. Binaries with periods between these two ex…
A low-frequency sub-arcsecond view of powerful radio galaxies in rich-cluster environments: 3C 34 and 3C 320
Hardcastle, M. J.; van Weeren, R. J.; Morabito, L. K. +2 more
Models of radio galaxy physics have been primarily based on high frequency (≥1 GHz) observations of their jets, hotspots, and lobes. Without highly resolved low-frequency observations, which provide information on older plasma, our understanding of the dynamics of radio galaxies and their interaction with their environment is limited. Here, we pre…
Detection of He++ ion in the star-forming ring of the Cartwheel using MUSE data and ionizing mechanisms
Charlot, S.; Bruzual, G.; Plat, A. +3 more
We here report the detection of the nebular He II λ4686 line in 32 H II regions in the metal-poor collisional ring galaxy Cartwheel using the Multi-Unit Spectroscopic Explorer (MUSE) data set. The measured I(He II λ4686)/I(H β) ratio varies from 0.004 to 0.07, with a mean value of 0.010 ± 0.003. Ten of these 32 H II regions are coincident with the…
Carbon stars as standard candles - III. Un-binned maximum likelihood fitting and comparison with TRGB estimations
Rousseau-Nepton, Laurie; Heyl, Jeremy; Richer, Harvey +2 more
In the second paper of this series, we developed a new distance determination method using the median J magnitude of carbon-rich asymptotic giant branch stars (CS) as standard candles and the Magellanic Clouds as the fundamental calibrators. The J-band CS luminosity function was modelled using a modified Lorentzian distribution whose parameters we…
What boost galaxy mergers in two massive galaxy protoclusters at z = 2.24?
Fan, Xiaohui; Cai, Zheng; Zheng, Xian Zhong +10 more
Characterizing the structural properties of galaxies in high-redshift protoclusters is key to our understanding of the environmental effects on galaxy evolution in the early stages of galaxy and structure formation. In this study, we assess the structural properties of 85 and 87 Hα emission-line candidates (HAEs) in the densest regions of two mass…
TOI-332 b: a super dense Neptune found deep within the Neptunian desert
Vanderburg, Andrew; Hellier, Coel; Latham, David W. +49 more
To date, thousands of planets have been discovered, but there are regions of the orbital parameter space that are still bare. An example is the short period and intermediate mass/radius space known as the 'Neptunian desert', where planets should be easy to find but discoveries remain few. This suggests unusual formation and evolution processes are…