Identification of five interacting binaries in the galactic bulge survey

C. T. Britt, Manuel A P Torres, R. I. Hynes, Peter G Jonker, T J Maccarone, S. Greiss, D. Steeghs, P. J. Groot, C. Knigge, A. Dieball, Gijs Nelemans, Valerie J Mikles, L. Gossen

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)


We present optical light curves, spectroscopy, and classification of five X-ray sources in the Chandra Galactic Bulge Survey (CXOGBS J174009.1-284725 (CX5), CXOGBS J173935.7-272935 (CX18), CXOGBS J173946.9-271809 (CX28), CXOGBS J173729.1-292804 (CX37), CXOGBS J174607.6-261547 (CX561)). These objects were selected based on bright optical counterparts which were quickly found to have emission lines in their optical spectra. This paper presents an illustration of GBS optical follow-up, targeting emission line objects. Of these five objects, four exhibit photometric variability in the Sloan r′ band. CX5 shows a tentative period of 2.1 hr and is clearly an intermediate polar (IP). CX28 and CX37 both exhibit flickering with no clear period. Both are also suggested to be IPs. CX18 was observed to undergo two dwarf nova outbursts. Finally, CX561 shows no detectable variability, although its characteristics would be consistent with either a quiescent low-mass X-ray binary or cataclysmic variable.

Original languageEnglish
Article number120
JournalThe Astrophysical Journal
Issue number2
Publication statusPublished - 1 Jun 2013
Externally publishedYes


  • binaries: close
  • novae, cataclysmic variables
  • stars: dwarf novae
  • stars: emission-line, Be
  • surveys
  • X-rays: binaries

Cite this