Baade-Wesselink Analysis of RR Lyrae Stars in the Globular Cluster M3

Johanna Jurcsik

An extended photometric and simultaneous spectroscopic observation campaign measuring time-series data of the variables in the M3 globular cluster was conducted in 2012. The obtained BVI_C light curves have good modulation-phase coverage for most of the Blazhko variables, and the spectroscopic data provide the largest sample of radial velocity (RV) curves of RR Lyrae (RRL) stars ever obtained. These data have made it possible to perform Baade-Wesselink (B-W) analysis of dozens of regular variables and to show why the B-W technique cannot be applied for stars exhibiting the Blazhko effect.

Proceedings of the Polish Astronomical Society, vol. 6, 181-185 (2018)

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