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

J. Skottfelt; D. M. Bramich; Roberto Jose Figuera Jaimes; U. G. Jorgensen; Noé Kains; K. B. W. Harpsoe; C. Liebig; M. T. Penny; K. A. Alsubai; J. M. Andersen; V. Bozza; P. Browne; S. Calchi Novati; Y. Damerdji; C. Diehl; M. Dominik; A. Elyiv; E. Giannini; F. Hessman; T. C. Hinse; M. 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

doi:10.1051/0004-6361/201321430

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

J. Skottfelt^*, D. M. Bramich, Roberto Jose Figuera Jaimes, U. G. Jorgensen, Noé Kains, K. B. W. Harpsoe, C. Liebig, M. T. Penny, K. A. Alsubai, 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

^*Corresponding author for this work

School of Physics and Astronomy

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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 variables were 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 language	English
Article number	A111
Number of pages	4
Journal	Astronomy & Astrophysics
Volume	553
DOIs	https://doi.org/10.1051/0004-6361/201321430
Publication status	Published - May 2013

Keywords

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

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10.1051/0004-6361/201321430

Dominik_2013_AA_EMCCD
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Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014
Horne, K. D. (PI)
Science & Technology Facilities Council
1/10/11 → 31/03/12
Project: Standard

1 Article

EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981 (Corrigendum)
Skottfelt, J., Bramich, D. M., Jaimes, R. F., Jorgensen, U. G., Kains, N., Harpsoe, K. B. W., Liebig, C., Penny, M. T., Alsubai, K. A., Andersen, J. M., Bozza, V., Browne, P., Novati, S. C., Damerdji, Y., Diehl, C., Dominik, M., Elyiv, A., Giannini, E., Hessman, F. & Hinse, T. C. & 16 others, 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., 1 Oct 2013, In: Astronomy & Astrophysics. 558, 2 p., C1.
Research output: Contribution to journal › Article › peer-review

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Skottfelt, J., Bramich, D. M., Figuera Jaimes, R. J., Jorgensen, U. G., Kains, N., Harpsoe, K. B. W., 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., ... 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 A111. https://doi.org/10.1051/0004-6361/201321430

@article{e3a344f17cef4f5b9e8f4db7004b5665,

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

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 variables were 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.",

keywords = "Globular clusters: individual: NGC 6981, Stars: variables: RR Lyrae, Instrumentation: high angular resolution, Stars: variables: general",

author = "J. Skottfelt and Bramich, {D. M.} and {Figuera Jaimes}, {Roberto Jose} and Jorgensen, {U. G.} and No{\'e} Kains and Harpsoe, {K. B. W.} and C. Liebig and Penny, {M. T.} and Alsubai, {K. A.} and Andersen, {J. M.} and V. Bozza and P. Browne and {Calchi Novati}, S. and Y. Damerdji and C. Diehl and M. Dominik and A. Elyiv and E. Giannini and F. Hessman and Hinse, {T. C.} and M. Hundertmark and D. Juncher and E. Kerins and H. Korhonen and L. Mancini and R. Martin and M. Rabus and S. Rahvar and G. Scarpetta and J. Southworth and C. Snodgrass and Street, {R. A.} and J. Surdej and J. Tregloan-Reed and C. Vilela and A. Williams",

note = "J.S. acknowledges support from the ESO 2012 DGDF for a two month visit to ESO Garching. The operation of the Danish 1.54 m telescope is financed by a grant to UGJ from the Danish Natural Science Research Council. We also acknowledge support from the European Community{\textquoteright}s Seventh Framework Programme (FP7/2007−2013/) under grant agreement Nos. 229517, 268421 and 274889 and from the Center of Excellence Centre for Star and Planet Formation (StarPlan) funded by The Danish National Research Foundation. K.A.A., M.D., D.M.B., C.L., M.H., R.A.S. and C.S. are thankful to Qatar National Research Fund (QNRF), member of Qatar Foundation, for support by grant NPRP 09-476-1-078. Y.D., A.E. under J.S. acknowledge support from the Communaut{\'e} fran{\c c}aise de Belgique – Actions de recherche concert{\'e}es – Acad{\'e}mie universitaire to Wallonie-Europe. TCH acknowledges support from the Korea Research Council of Fundamental Science & Technology (KRCF) via the KRCF Young Scientist Research Fellowship Programme and for financial support from KASI travel grant number 2013-9-400-00. M.R. acknowledges support from FONDECYT postdoctoral fellowship No. 3120097.",

year = "2013",

month = may,

doi = "10.1051/0004-6361/201321430",

language = "English",

volume = "553",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

}

Skottfelt, J, Bramich, DM, Figuera Jaimes, RJ, Jorgensen, UG, Kains, N, Harpsoe, KBW, Liebig, C, Penny, MT, Alsubai, KA, 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 & Astrophysics, vol. 553, A111. https://doi.org/10.1051/0004-6361/201321430

TY - JOUR

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, Roberto Jose

AU - Jorgensen, U. G.

AU - Kains, Noé

AU - Harpsoe, K. B. W.

AU - Liebig, C.

AU - Penny, M. T.

AU - Alsubai, K. A.

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.

N1 - J.S. acknowledges support from the ESO 2012 DGDF for a two month visit to ESO Garching. The operation of the Danish 1.54 m telescope is financed by a grant to UGJ from the Danish Natural Science Research Council. We also acknowledge support from the European Community’s Seventh Framework Programme (FP7/2007−2013/) under grant agreement Nos. 229517, 268421 and 274889 and from the Center of Excellence Centre for Star and Planet Formation (StarPlan) funded by The Danish National Research Foundation. K.A.A., M.D., D.M.B., C.L., M.H., R.A.S. and C.S. are thankful to Qatar National Research Fund (QNRF), member of Qatar Foundation, for support by grant NPRP 09-476-1-078. Y.D., A.E. under J.S. acknowledge support from the Communauté française de Belgique – Actions de recherche concertées – Académie universitaire to Wallonie-Europe. TCH acknowledges support from the Korea Research Council of Fundamental Science & Technology (KRCF) via the KRCF Young Scientist Research Fellowship Programme and for financial support from KASI travel grant number 2013-9-400-00. M.R. acknowledges support from FONDECYT postdoctoral fellowship No. 3120097.

PY - 2013/5

Y1 - 2013/5

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 variables were 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 variables were 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 - Stars: variables: RR Lyrae

KW - Instrumentation: high angular resolution

KW - Stars: variables: general

U2 - 10.1051/0004-6361/201321430

DO - 10.1051/0004-6361/201321430

M3 - Article

SN - 0004-6361

VL - 553

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A111

ER -

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

Abstract

Keywords

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Projects

Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014

Research output

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

Cite this