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8 papers · 2 filters
Single-lens mass measurement in the high-magnification microlensing event Gaia19bld located in the Galactic disc
K. A. Rybicki, Ł. Wyrzykowski, E. Bachelet +66
We present the photometric analysis of Gaia19bld, a high-magnification () microlensing event located in the southern Galactic plane, which exhibited finite source and m…
Abundance of zirconium in the globular cluster 47 Tuc: a possible Zr-Na correlation?
E. Kolomiecas, V. Dobrovolskas, A. Kučinskas +2
We determined abundances of Na and Zr in the atmospheres of 237 RGB stars in Galactic globular cluster (GGC) 47 Tuc (NGC 104), with a primary objective of investigating possible di…
Gaia-ESO Survey: Detailed elemental abundances in red giants of the peculiar globular cluster NGC 1851
G. Tautvaisiene, A. Drazdauskas, A. Bragaglia +24
Context. NGC 1851 is one of several globular clusters for which multiple stellar populations of the subgiant branch have been clearly identified and a difference in metallicity det…
Abundance of barium in the atmospheres of red giants in the Galactic globular cluster NGC 104 (47 Tuc)
V. Dobrovolskas, E. Kolomiecas, A. Kučinskas +2
Context. While most (if not all) Type I Galactic globular clusters (GGCs) are characterised by spreads in the abundances of light chemical elements (e.g. Li, N, O, Na, Mg, Al), it…
The Gaia-ESO Survey: Galactic evolution of lithium from iDR6
D. Romano, L. Magrini, S. Randich +31
We exploit the unique characteristics of a sample of open clusters (OCs) and field stars for which high-precision 7Li abundances and stellar parameters are homogeneously derived by…
Interstellar extinction, polarization, and grain alignment in the Sh 2-185 (IC 59 and IC 63) region
Archana Soam, B-G Andersson, V. Straižys +6
Optical and infrared continuum polarization from the interstellar medium is driven by radiative processes aligning the grains with the magnetic field. While a quantitative, predict…
Magnetic-buoyancy-induced mixing in AGB Stars: a theoretical explanation of the non-universal [Y/Mg]-age relation
Magrini L., Vescovi D., Casali G. +6
The use of abundance ratios involving Y, or other slow-neutron capture elements, are routinely used to infer stellar ages.Aims.We aim to explain the observed [Y/H] and [Y/Mg] abund…
High-redshift SMBHs can grow from stellar-mass seeds via chaotic accretion
Kastytis Zubovas, Andrew R. King
Extremely massive black holes, with masses , have been observed at ever higher redshifts. These results create ever tighter constraints on the formation…