Aims: We present a spectroscopic analysis of the extremely luminous red star VX Sgr based on high-resolution observations combined with AAVSO light curve data. Given the puzzling characteristics of VX Sgr, we explore three scenarios for its nature: a massive red supergiant (RSG) or red hypergiant (RHG), a Thorne Żytkow object, and an extreme
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The nature of VX Sagitarii. Is it a TŻO, a RSG, or a high-mass AGB star?Tabernero, H. M. et al.22021Bibcode
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Turbulent Gas in Lensed Planck-selected Starbursts at z ∼ 1-3.5
Dusty star-forming galaxies at high redshift (1 < z < 3) represent the most intense star-forming regions in the universe. Key aspects to these processes are the gas heating and cooling mechanisms, and although it is well known that these galaxies are gas-rich, little is known about the gas excitation conditions. Only a few detailed radiative
Harrington, Kevin C. et al.Advertised on:
22021Bibcode -
Two-fluid simulations of Rayleigh-Taylor instability in a magnetized solar prominence thread. I. Effects of prominence magnetization and mass loading
Solar prominences are formed by partially ionized plasma with inter-particle collision frequencies, which generally warrant magnetohydrodynamic treatment. In this work, we explore the dynamical impacts and observable signatures of two-fluid effects in the parameter regimes when ion-neutral collisions do not fully couple the neutral and charged
Popescu Braileanu, B. et al.Advertised on:
22021Bibcode -
Ultramassive Black Holes in the Most Massive Galaxies: M<SUB>BH</SUB>-σ versus M<SUB>BH</SUB>-R<SUB>b</SUB>
We investigate the nature of the relations between black hole (BH) mass (MBH) and the central velocity dispersion (σ) and, for core-Sérsic galaxies, the size of the depleted core (Rb). Our sample of 144 galaxies with dynamically determined MBH encompasses 24 core-Sérsic galaxies, thought to be products of gas-poor mergers, and reliably identified
Dullo, Bililign T. et al.Advertised on:
22021Bibcode -
Updated BaSTI Stellar Evolution Models and Isochrones. II. α-enhanced Calculations
This is the second paper of a series devoted to presenting an updated release of the BaSTI (a Bag of Stellar Tracks and Isochrones) stellar model and isochrone library. Following the publication of the updated solar-scaled library, here we present the library for an α-enhanced heavy element distribution. These new α-enhanced models account for all
Pietrinferni, Adriano et al.Advertised on:
22021Bibcode -
Erratum: Evaluating hydrodynamical simulations with green valley galaxiesAngthopo, J. et al.
Advertised on:
42021Bibcode