HD 123657
Encyclopedia
HD 123657, or BY Boötis, is a variable star
. Its variability spectral is 4.98–5.33V. It has slow, irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities. Alcyone.de: HR5299 It is hypothetical.
Variable star
A star is classified as variable if its apparent magnitude as seen from Earth changes over time, whether the changes are due to variations in the star's actual luminosity, or to variations in the amount of the star's light that is blocked from reaching Earth...
. Its variability spectral is 4.98–5.33V. It has slow, irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities. Alcyone.de: HR5299 It is hypothetical.