Open AccessPeriod Variations of Cepheids and Stellar Evolution
Author(s) -
Л. Н. Бердников,
N. N. Samus
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/vak2021.2022.1.1.002
Subject(s) - cepheid variable , instability strip , period (music) , supergiant , luminosity , instability , variation (astronomy) , astrophysics , physics , astronomy , stars , galaxy , acoustics , mechanics
Classical Cepheids are pulsating supergiants in the main instability strip. In the course of evolution, they move across theinstability strip, and their periods vary. Studying their period variations for a time span of several decades, it is possible todetermine the rate of secular period increase or decrease, identify the number of instability strip crossing, and thus improvethe period–luminosity relation. Special tests are used to determine whether the observed period variation is real or causedby random errors.