Abstract

Poster - Splinter Populations

Photometric variability in globular clusters

Benjamin Bischoff¹, Tim-Oliver Husser¹, Stefan Dreizler¹, Sebastian Kamann^1,2, Benjamin Giesers^1
1Institute for Astrophysics, Georg-August-University, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
²Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, United Kingdom

It is well known, that most globular clusters (GC) contain photometric variable stars. Using differential photometry on MUSE data, we were able to detect most of the RR Lyrae stars and other bright variables in the studied GCs. The used broadband filters V and I were reconstructed from the MUSE spectra. The photometric precision achieved is in the range of 0.03 \mathrmmag.
Since the MUSE data provides us with the whole spectral information, the Balmer lines H_\alpha and H_\beta could also be examined for variability. Although only the two Balmer lines were analysed, the used algorithm can be easily extended to other spectral lines.
Possible candidates of new variable stars were found in both, the broadband and the narrowband filters, but further research is needed to eliminate false positives.