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

Skottfelt, Jesper; Bramich, D. M.; Figuera Jaimes, R.; Jørgensen, U. G.; Kains, N.; W Harpsøe, K. B.; Liebig, C.; Penny, M. T.; Alsubai, K. A.; Andersen, J. M.; Bozza, V.; Browne, P.; Calchi Novati, S.; Damerdji, Y.; Diehl, C.; Dominik, M.; Elyiv, A.; Giannini, E.; Hessman, F.; Hinse, T. C.; Hundertmark, M.; Juncher, D.; Kerins, E.; Korhonen, H.; Mancini, L.; Martin, R.; Rabus, M.; Rahvar, S.; Scarpetta, G.; Southworth, J.; Snodgrass, Colin; Street, R. A.; Surdej, J.; Tregloan-Reed, J.; Vilela, C. and Williams, A. (2013). EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981. Astronomy & Astrophysics, 553, article no. A111.

DOI: https://doi.org/10.1051/0004-6361/201321430

Abstract

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.

Viewing alternatives

Metrics

Item Actions

Export

You can export this page using these formats Digital Object Identifier - DOI

About

• Item ORO ID
• 43049
• Item Type
• Journal Item
• ISSN
• 1432-0746
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	Grant NPRP 09-476-1-078	Qatar National Research Fund (QNRF), member of Qatar Foundation
  Seventh Framework Programme (FP7/2007−2013/)	Grant agreement Nos. 229517, 268421 and 274889	EU
  Center of Excellence Centre for Star and Planet Formation (StarPlan)	Not Set	The Danish National Research Foundation

• Keywords
• globular clusters: individual: NGC 6981; stars: variables: RR Lyrae; instrumentation: high angular resolution; stars: variables: general
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Research Group
• Centre for Electronic Imaging (CEI)
  ?? space ??
• Copyright Holders
• © 2013 ESO
• Depositing User
• Colin Snodgrass