Loading...

EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981

Skottfelt, J ; Sharif University of Technology | 2013

521 Viewed
  1. Type of Document: Article
  2. DOI: 10.1051/0004-6361/201321430
  3. Publisher: 2013
  4. Abstract:
  5. Two previously unknown variable stars in the crowded central region of the globular cluster NGC 6981 are presented. The observations were made using the electron multiplying CCD (EMCCD) camera at the Danish 1.54 m Telescope at La Silla, Chile. The two variableswere not previously detected by conventional CCD imaging because of their proximity to a bright star. This discovery demonstrates that EMCCDs are a powerful tool for performing high-precision time-series photometry in crowded fields and near bright stars, especially when combined with difference image analysis
  6. Keywords:
  7. Globular clusters: individual: NGC 6981 ; Difference images ; Electron multiplying ccds ; Globular clusters ; Globular clusters: individual ; Instrumentation:high angular resolution ; Stars: variables: general ; Stars: variables: RR Lyrae ; Variable stars ; Photometry ; Stars
  8. Source: Astronomy and Astrophysics ; Volume 553 , May , 2013 ; 00046361 (ISSN)
  9. URL: http://www.aanda.org/articles/aa/abs/2013/05/aa21430-13/aa21430-13.html