Open AccessA search of unresolved binaries in open clusters by the photometry data in visible and infrared
Author(s) -
A. F. Seleznev,
Alina A. Malofeeva
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.194
Subject(s) - pleiades , photometry (optics) , physics , stars , astrophysics , open cluster , infrared , solar mass , astronomy , brown dwarf , mass ratio , diagram , binary star , hertzsprung–russell diagram , stellar mass , binary number , stellar evolution , star formation , statistics , mathematics , arithmetic
The general idea is to nd the photometric diagram where the unresolved binary stars are well detached from the singlestars, even for small values of the component mass ratio q. We use the diagram (H-W2)-W1—W2-(BP-K) to estimate thebinary and multiple star ratio and the distribution of q for the Pleiades in the primary component mass interval between0.5 and 1.8 solar masses. A large number of binaries with secondary components being brown dwarfs or stars with theremnants of protostellar discs providing slight infrared excess are among the low-mass stars with the mass of the primarycomponent lower than 0.5 solar masses.