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  • 标题:A stellar census in globular clusters with MUSE: A spectral catalogue of emission-line sources ⋆
  • 本地全文:下载
  • 作者:Fabian Göttgens ; Tim-Oliver Husser ; Sebastian Kamann
  • 期刊名称:Astronomy & Astrophysics
  • 印刷版ISSN:0004-6361
  • 电子版ISSN:1432-0746
  • 出版年度:2019
  • 卷号:631
  • 页码:1-16
  • DOI:10.1051/0004-6361/201936485
  • 语种:English
  • 出版社:EDP Sciences
  • 摘要: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 differences between each observed 1D spectrum and its fitted spectral model. The spectra with the most significant detections of Hαemission are checked visually and cross-matched with published catalogues.Results.We find 156 stars with Hαemission, 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 Hαemission in several spectra of stars that are close to known positions ofChandraX-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.
  • 关键词:englobular clusters: generalstars: emission-line, Benovae, cataclysmic variablescatalogstechniques: imaging spectroscopy
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