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

J. Skottfelt, D. M. Bramich, R. Figuera Jaimes, U. G. Jørgensen, N. Kains, K. B. W Harpsøe, C. Liebig, M. T. Penny, Khalid Al-Subai, J. M. Andersen, V. Bozza, P. Browne, S. Calchi Novati, Y. Damerdji, C. Diehl, M. Dominik, A. Elyiv, E. Giannini, F. Hessman, T. C. HinseM. Hundertmark, D. Juncher, E. Kerins, H. Korhonen, L. Mancini, R. Martin, M. Rabus, S. Rahvar, G. Scarpetta, J. Southworth, C. Snodgrass, R. A. Street, J. Surdej, J. Tregloan-Reed, C. Vilela, A. Williams

Research output: Contribution to journalArticle

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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.

Original languageEnglish
Article numberA111
JournalAstronomy and Astrophysics
Volume553
DOIs
Publication statusPublished - 27 May 2013

Fingerprint

variable stars
globular clusters
image analysis
photometry
charge coupled devices
time series
stars
electron
Chile
CCD cameras
proximity
electrons
telescopes

Keywords

  • Globular clusters: individual: NGC 6981
  • Instrumentation: high angular resolution
  • Stars: variables: general
  • Stars: variables: RR Lyrae

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981. / Skottfelt, J.; Bramich, D. M.; Figuera Jaimes, R.; Jørgensen, U. G.; Kains, N.; W Harpsøe, K. B.; Liebig, C.; Penny, M. T.; Al-Subai, Khalid; 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, C.; Street, R. A.; Surdej, J.; Tregloan-Reed, J.; Vilela, C.; Williams, A.

In: Astronomy and Astrophysics, Vol. 553, A111, 27.05.2013.

Research output: Contribution to journalArticle

Skottfelt, J, Bramich, DM, Figuera Jaimes, R, Jørgensen, UG, Kains, N, W Harpsøe, KB, Liebig, C, Penny, MT, Al-Subai, K, Andersen, JM, Bozza, V, Browne, P, Calchi Novati, S, Damerdji, Y, Diehl, C, Dominik, M, Elyiv, A, Giannini, E, Hessman, F, Hinse, TC, Hundertmark, M, Juncher, D, Kerins, E, Korhonen, H, Mancini, L, Martin, R, Rabus, M, Rahvar, S, Scarpetta, G, Southworth, J, Snodgrass, C, Street, RA, Surdej, J, Tregloan-Reed, J, Vilela, C & Williams, A 2013, 'EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981', Astronomy and Astrophysics, vol. 553, A111. https://doi.org/10.1051/0004-6361/201321430
Skottfelt, J. ; Bramich, D. M. ; Figuera Jaimes, R. ; Jørgensen, U. G. ; Kains, N. ; W Harpsøe, K. B. ; Liebig, C. ; Penny, M. T. ; Al-Subai, Khalid ; 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, C. ; Street, R. A. ; Surdej, J. ; Tregloan-Reed, J. ; Vilela, C. ; Williams, A. / EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981. In: Astronomy and Astrophysics. 2013 ; Vol. 553.
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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.",
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T1 - EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981

AU - Skottfelt, J.

AU - Bramich, D. M.

AU - Figuera Jaimes, R.

AU - Jørgensen, U. G.

AU - Kains, N.

AU - W Harpsøe, K. B.

AU - Liebig, C.

AU - Penny, M. T.

AU - Al-Subai, Khalid

AU - Andersen, J. M.

AU - Bozza, V.

AU - Browne, P.

AU - Calchi Novati, S.

AU - Damerdji, Y.

AU - Diehl, C.

AU - Dominik, M.

AU - Elyiv, A.

AU - Giannini, E.

AU - Hessman, F.

AU - Hinse, T. C.

AU - Hundertmark, M.

AU - Juncher, D.

AU - Kerins, E.

AU - Korhonen, H.

AU - Mancini, L.

AU - Martin, R.

AU - Rabus, M.

AU - Rahvar, S.

AU - Scarpetta, G.

AU - Southworth, J.

AU - Snodgrass, C.

AU - Street, R. A.

AU - Surdej, J.

AU - Tregloan-Reed, J.

AU - Vilela, C.

AU - Williams, A.

PY - 2013/5/27

Y1 - 2013/5/27

N2 - 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.

AB - 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.

KW - Globular clusters: individual: NGC 6981

KW - Instrumentation: high angular resolution

KW - Stars: variables: general

KW - Stars: variables: RR Lyrae

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