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A buyer's guide to the Hubble constant
DOI: 10.1007/s00159-021-00137-4 Bibcode: 2021A&ARv..29....9S

Lahav, Ofer; Lemos, Pablo; Shah, Paul

Since the expansion of the universe was first established by Edwin Hubble and Georges Lemaître about a century ago, the Hubble constant H0 which measures its rate has been of great interest to astronomers. Besides being interesting in its own right, few properties of the universe can be deduced without it. In the last decade, a signific…

2021 Astronomy and Astrophysics Review
Gaia 155
Magnetic fields of M dwarfs
DOI: 10.1007/s00159-020-00130-3 Bibcode: 2021A&ARv..29....1K

Kochukhov, Oleg

Magnetic fields play a fundamental role for interior and atmospheric properties of M dwarfs and greatly influence terrestrial planets orbiting in the habitable zones of these low-mass stars. Determination of the strength and topology of magnetic fields, both on stellar surfaces and throughout the extended stellar magnetospheres, is a key ingredien…

2021 Astronomy and Astrophysics Review
Gaia 110
Weighing stars from birth to death: mass determination methods across the HRD
DOI: 10.1007/s00159-021-00132-9 Bibcode: 2021A&ARv..29....4S

Feuillet, Diane K.; Girardi, Léo; Stassun, Keivan G. +31 more

The mass of a star is the most fundamental parameter for its structure, evolution, and final fate. It is particularly important for any kind of stellar archaeology and characterization of exoplanets. There exist a variety of methods in astronomy to estimate or determine it. In this review we present a significant number of such methods, beginning …

2021 Astronomy and Astrophysics Review
Gaia 73