Digging deeper into the dense galactic globular cluster Terzan 5 with electron-multiplying CCDs. Variable star detection and new discoveries

R. Figuera Jaimes, M. Catelan, K. Horne, J. Skottfelt, C. Snodgrass, M. Dominik, U. G. Jørgensen, J. Southworth, M. Hundertmark, P. Longa-Peña, S. Sajadian, J. Tregolan-Reed, T. C. Hinse, M. I. Andersen, M. Bonavita, V. Bozza, M. J. Burgdorf, L. Haikala, E. Khalouei, H. KorhonenN. Peixinho, M. Rabus, S. Rahvar

Research output: Contribution to journalArticlepeer-review


Context. High frame-rate imaging was employed to mitigate the effects of atmospheric turbulence (seeing) in observations of globular cluster Terzan 5. Aims. High-precision time-series photometry has been obtained with the highest angular resolution so far taken in the crowded central region of Terzan 5, with ground-based telescopes, and ways to avoid saturation of the brightest stars in the field observed. Methods. The Electron-Multiplying Charge Coupled Device (EMCCD) camera installed at the Danish 1.54-m telescope at the ESO La Silla Observatory was employed to produce thousands of short-exposure time images (ten images per second) that were stacked to produce the normal-exposure-time images (minutes). We employed difference image analysis in the stacked images to produce high-precision photometry using the DanDIA pipeline. Results. Light curves of 1670 stars with 242 epochs were analyzed in the crowded central region of Terzan 5 to statistically detect variable stars in the field observed. We present a possible visual counterpart outburst at the position of the pulsar J1748-2446N, and the visual counterpart light curve of the low-mass X-ray binary CX 3. Additionally, we present the discovery of 4 semiregular variables. We also present updated ephemerides and properties of the only RR Lyrae star previously known in the field covered by our observations in Terzan 5. Finally, we report a significant displacement of two sources by ~0.62 and 0.59 arcseconds with respect to their positions in previous images available in the literature.
Original languageEnglish
JournalAstronomy & Astrophysics
Publication statusAccepted/In press - 26 Jun 2024


  • (Galaxy): globular clusters: individual: Terzan 5
  • Stars: variables: general: RR Lyrae
  • Techniques: high angular resolution, image processing
  • Instrumentation: detectors


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