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

Autor:	A. A. Arkharov, E. V. Ruban
Rok vydání:	2010
Předmět:	Photometry (optics) Physics Brightness Stars Amplitude Astronomy Astronomy and Astrophysics Astrophysics Orbital period Stellar classification
Zdroj:	Astrophysics. 53:523-535
ISSN:	1573-8191 0571-7256
DOI:	10.1007/s10511-010-9144-7
Popis:	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 brightness minimum of the main cycle. The magnitudes of 2 Cen and σ Lib changed by 0m.10-0m.15 over 15-20 min. These variations were repeated over time intervals that were multiples of 150-180 min. The spread in the magnitudes of L2 Pup was 0m.02-0m.06 over days. Rapid bursts with brightness increases of up to ~0m.1 within seconds, over time intervals of
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ea7e8d6ff54574a55c126250b9fcc04f https://doi.org/10.1007/s10511-010-9144-7 Zobrazit plný text záznamu Plný text ve formátu PDF