Digging deeper into the dense Galactic globular cluster Terzan 5 with Electron-Multiplying CCDs. Variable star detection and new discoveries
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| author | Jaimes, R. Figuera Catelan, M. Horne, K. Skottfelt, J. Snodgrass, C. Dominik, M. Jørgensen, U. G. Southworth, J. Hundertmark, M. Longa-Peña, P. Sajadian, S. Tregolan-Reed, J. Hinse, T. C. Andersen, M. I. Bonavita, M. Bozza, V. Burgdorf, M. J. Haikala, L. Khalouei, E. Korhonen, H. Peixinho, N. Rabus, M. Rahvar, S. |
| author_facet | Jaimes, R. Figuera Catelan, M. Horne, K. Skottfelt, J. Snodgrass, C. Dominik, M. Jørgensen, U. G. Southworth, J. Hundertmark, M. Longa-Peña, P. Sajadian, S. Tregolan-Reed, J. Hinse, T. C. Andersen, M. I. Bonavita, M. Bozza, V. Burgdorf, M. J. Haikala, L. Khalouei, E. Korhonen, H. Peixinho, N. Rabus, M. Rahvar, S. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_18733 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Digging deeper into the dense Galactic globular cluster Terzan 5 with Electron-Multiplying CCDs. Variable star detection and new discoveries Jaimes, R. Figuera Catelan, M. Horne, K. Skottfelt, J. Snodgrass, C. Dominik, M. Jørgensen, U. G. Southworth, J. Hundertmark, M. Longa-Peña, P. Sajadian, S. Tregolan-Reed, J. Hinse, T. C. Andersen, M. I. Bonavita, M. Bozza, V. Burgdorf, M. J. Haikala, L. Khalouei, E. Korhonen, H. Peixinho, N. Rabus, M. Rahvar, S. Solar and Stellar Astrophysics Astrophysics of Galaxies 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. |
| title | Digging deeper into the dense Galactic globular cluster Terzan 5 with Electron-Multiplying CCDs. Variable star detection and new discoveries |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.18733 |