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Microvariability and fast variability of stars. II. The semiregular red giants L₂ Pup, 2 Cen, η Gem, and σ Lib

Arkharov, A. A.; Ruban, E. V.

This is a study of the photometric magnitudes Vt and Bt of four semiregular red giants of spectral classes M3-M6 III, L₂ Pup, 2 Cen, η Gem, and σ Lib, from the Hipparcos catalog to search for microvariability and rapid variations in their emission. It is shown that low amplitude variability shows up in the form of rapid changes in the b…

Microvariability and fast variability of stars. I. standard stars

Arkharov, A. A.; Ruban, E. V.

This is a study of observations of the photometric quantities Vt and Bt, reported in the Hipparcos catalog, for 15 standard stars in order to search for microvariability and rapid variability in their emission. The microvariability is found to be characterized mainly by smooth fluctuations in the brightness. Changes in the magnitudes of the stars …