1992/05/01 by K. Szatmáry, J. Vinkó · 1 citation
Physics and Astronomy · Engineering · Mathematics · #Stellar, planetary, and galactic studies #Astronomical Observations and Instrumentation #Astronomy and Astrophysical Research #Physics #Light curve #Astrophysics #Variable star #Star (game theory) #Variable (mathematics) #Stars #Interval (graph theory) #Combinatorics #Mathematical analysis #Mathematics
paper · pdf · doi:10.1093/mnras/256.2.321
openalex publication_date 1992/05/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/16
A 16.8-yr-long visual light curve of the long-period SRc-type red variable Y Lyn (from 1973 to 1990) is presented and discussed. The observations were made by the members of the ‘Pleione Variable Star Observing Network’ (PVH) of the Hungarian Astronomical Association. The Fourier analysis of the whole data set results in four significant periods: P0 = 1190 d, P1 = 595 d, P2214 d and P3 = 133 d. The reliability of these periods is checked by the CLEAN algorithm. The presence of P1 is probably due to the non-sinusoidal shape of the light variation. The wavelet transform of the light curve shows that the two shorter periods are unstable as observed in several other SR-type variable stars. The effect of the observational uncertainties and errors on the resultant periods are investigated. It clearly demonstrates from the point of view of the accuracy of the periods that the length of the observational time interval is much more important than the errors of the individual observations. Adopting P0 as the fundamental radial pulsational period and using some theoretical and empirical relations some of the physical properties of the variable could be estimated and were found to be |R = 580 \enspace R_\odot, L = 25\enspace 000 \enspace L_\odot,\enspace Teff = 3000 \enspace \text K and \enspace 1.5 \enspace M_\odot ≤ M ≤ 2M_\odot|.