TY  - JOUR
A1  - Göttgens, Fabian
A1  - Husser, Tim-Oliver
A1  - Kamann, Sebastian
A1  - Dreizler, Stefan
A1  - Giesers, Benjamin
A1  - Kollatschny, Wolfram
A1  - Weilbacher, Peter Michael
A1  - Roth, Martin M.
A1  - Wendt, Martin
T1  - A stellar census in globular clusters with MUSE: A spectral catalogue of emission-line sources
JF  - Astronomy and astrophysics : an international weekly journal
N2  - Aims. Globular clusters produce many exotic stars due to a much higher frequency of dynamical interactions in their dense stellar environments. Some of these objects were observed together with several hundred thousand other stars in our MUSE survey of 26 Galactic globular clusters. Assuming that at least a few exotic stars have exotic spectra (i.e. spectra that contain emission lines), we can use this large spectroscopic data set of over a million stellar spectra as a blind survey to detect stellar exotica in globular clusters. Methods. To detect emission lines in each spectrum, we modelled the expected shape of an emission line as a Gaussian curve. This template was used for matched filtering on the di fferences between each observed 1D spectrum and its fitted spectral model. The spectra with the most significant detections of H alpha emission are checked visually and cross-matched with published catalogues. Results. We find 156 stars with H alpha emission, including several known cataclysmic variables (CV) and two new CVs, pulsating variable stars, eclipsing binary stars, the optical counterpart of a known black hole, several probable sub-subgiants and red stragglers, and 21 background emission-line galaxies. We find possible optical counterparts to 39 X-ray sources, as we detected H alpha emission in several spectra of stars that are close to known positions of Chandra X-ray sources. This spectral catalogue can be used to supplement existing or future X-ray or radio observations with spectra of potential optical counterparts to classify the sources.
KW  - globular clusters: general
KW  - stars: emission-line, Be
KW  - novae
KW  - cataclysmic variables
KW  - catalogs
KW  - techniques: imaging spectroscopy
Y1  - 2019
U6  - https://doi.org/10.1051/0004-6361/201936485
SN  - 0004-6361
SN  - 1432-0746
VL  - 631
PB  - EDP Sciences
CY  - Les Ulis
ER  -