Astronomy & Astrophysics

Volume 645 (January 2021)


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Letters to the Editor

Astrophysical processes

Cosmology (including clusters of galaxies)

Extragalactic astronomy

Open Access

The properties of dwarf spheroidal galaxies in the Cen A group - Stellar populations, internal dynamics, and a heart-shaped Hα ring A92

Published online: 19 January 2021
DOI: https://doi.org/10.1051/0004-6361/202039359

Galactic structure, stellar clusters and populations

Interstellar and circumstellar matter

Press Release
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Open Access

C18O, 13CO, and 12CO abundances and excitation temperatures in the Orion B molecular cloud - Analysis of the achievable precision in modeling spectral lines within the approximation of the local thermodynamic equilibrium A26

Published online: 23 December 2020
DOI: https://doi.org/10.1051/0004-6361/202037776
Press Release
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Open Access

Quantitative inference of the H2 column densities from 3 mm molecular emission: case study towards Orion B A27

Published online: 23 December 2020
DOI: https://doi.org/10.1051/0004-6361/202037871
Press Release
Highlight
Open Access

Tracers of the ionization fraction in dense and translucent gas - I. Automated exploitation of massive astrochemical model grids A28

Published online: 23 December 2020
DOI: https://doi.org/10.1051/0004-6361/202038040

Stellar structure and evolution

Search for associations containing young stars (SACY) - VIII. An updated census of spectroscopic binary systems exhibiting hints of non-universal multiplicity among their associations A30

Published online: 24 December 2020
DOI: https://doi.org/10.1051/0004-6361/202037830

Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS - I. Asteroseismology of the GW Vir stars RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371, and K 1−16 A117

Published online: 22 January 2021
DOI: https://doi.org/10.1051/0004-6361/202039202

Stellar atmospheres

The Sun and the Heliosphere

Planets and planetary systems

Press Release
Free Access

The search for radio emission from the exoplanetary systems 55 Cancri, υ Andromedae, and τ Boötis using LOFAR beam-formed observations A59

Published online: 14 January 2021
DOI: https://doi.org/10.1051/0004-6361/201937201

Celestial mechanics and astrometry

Atomic, molecular, and nuclear data

Astronomical instrumentation

Catalogs and data

Numerical methods and codes

Free Access

Unveiling the rarest morphologies of the LOFAR Two-metre Sky Survey radio source population with self-organised maps A89

Published online: 19 January 2021
DOI: https://doi.org/10.1051/0004-6361/202038500