Search Publications
GIARPS High-resolution Observations of T Tauri stars (GHOsT). III. A pilot study of stellar and accretion properties
Munari, U.; Alcalá, J. M.; Manara, C. F. +8 more
The mass-accretion rate, Ṁacc, is a crucial parameter for the study of the evolution of accretion disks around young low-mass stellar objects (YSOs) and for planet formation studies. The Taurus star forming region (SFR) is rich in pre-main sequence stars, most of them of the T Tauri class. A variety of methodologies have been used in th…
A preserved high-z compact progenitor in the heart of NGC 3311 revealed with MUSE 2D stellar population analysis
Hilker, M.; Richtler, T.; Coccato, L. +3 more
Context. Massive early-type galaxies are believed to be the end result of an extended mass accretion history. The stars formed in situ very early on in the initial phase of the mass assembly might have originated from an extremely intense and rapid burst of star formation. These stars may still be found within the cores of such galaxies at z = 0, …
The Type II supernova SN 2020jfo in M 61, implications for progenitor system, and explosion dynamics
Sollerman, J.; Jerkstrand, A.; Filippenko, A. V. +25 more
We present the discovery and extensive follow-up observations of SN 2020jfo, a Type IIP supernova (SN) in the nearby (14.5 Mpc) galaxy M 61. Optical light curves (LCs) and spectra from the Zwicky Transient Facility (ZTF), complemented with data from Swift/UVOT and near-infrared photometry is presented. These were used to model the 350-day duration…
The ρ Ophiuchi region revisited with Gaia EDR3. Two young populations, new members, and old impostors
Meingast, Stefan; Alves, João; Lombardi, Marco +10 more
Context. Young and embedded stellar populations are important probes of the star formation process. Their properties and the environments they create have the potential to affect the formation of new planets. Paradoxically, we have a better census of nearby embedded young populations than of the slightly more evolved optically visible young popula…
Massive stars in the Small Magellanic Cloud. Evolution, rotation, and surface abundances
Bouret, J. -C.; Martins, F.; Hillier, D. J. +5 more
Context. The evolution of massive stars depends on several physical processes and parameters. Metallicity and rotation are among the most important, but their quantitative effects are not well understood.
Aims: To complement our earlier study on main-sequence stars, we study the evolutionary and physical properties of evolved O stars in the S…
Molecular remnant of Nova 1670 (CK Vulpeculae). II. A three-dimensional view of the gas distribution and velocity field
Menten, K. M.; Bujarrabal, V.; Steffen, W. +3 more
CK Vul is the remnant of an energetic eruption known as Nova 1670 that is thought to be caused by a stellar merger. The remnant is composed of (1) a large hourglass nebula of recombining gas (of 71'' in size), very similar to some classical planetary and pre-planetary nebulae (PPNe), and (2) a much smaller and cooler inner remnant that is prominen…
A dearth of young and bright massive stars in the Small Magellanic Cloud
Menten, K. M.; Crowther, P. A.; de Koter, A. +7 more
Context. Massive star evolution at low metallicity is closely connected to many fields in high-redshift astrophysics, but is poorly understood so far. Because of its metallicity of ∼0.2 Z⊙, its proximity, and because it is currently forming stars, the Small Magellanic Cloud (SMC) is a unique laboratory in which to study metal-poor massi…
The (im)possibility of strong chemical tagging
Castro-Ginard, A.; Casamiquela, L.; Anders, F. +1 more
Context. The possibility of identifying co-natal stars that have dispersed into the Galactic disc based on chemistry alone is called strong chemical tagging. It has been debated for a long time whether this is indeed feasible; it holds the promise of reconstructing the detailed star formation history of a large fraction of stars in the Galactic di…
Radial structure and formation of the Milky Way disc
Katz, D.; Haywood, M.; Gómez, A. +2 more
Context. The formation of the Galactic disc is an enthusiastically debated issue. Numerous studies and models seek to identify the dominant physical process(es) that shaped its observed properties; for example, satellite accretion, starburst, quenching, gas infall, and stellar radial migration.
Aims: Taking advantage of the improved coverage …
The Tarantula Massive Binary Monitoring. V. R 144: a wind-eclipsing binary with a total mass ≳140 M⊙
Howarth, I. D.; Crowther, P. A.; de Mink, S. E. +21 more
Context. The evolution of the most massive stars and their upper-mass limit remain insufficiently constrained. Very massive stars are characterized by powerful winds and spectroscopically appear as hydrogen-rich Wolf-Rayet (WR) stars on the main sequence. R 144 is the visually brightest WR star in the Large Magellanic Cloud. R 144 was reported to …