– Niels Bohr Institute - University of Copenhagen

Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations

Research output: Contribution to journalJournal articleResearchpeer-review

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Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations. / Skottfelt, Jesper; Bramich, D. M.; Jaimes, R. Figuera; Jørgensen, U. G.; Kains, N.; Ferro, A. Arellano; Alsubai, K. A.; Bozza, V.; Novati, S. Calchi; Ciceri, S.; D'Ago, G.; Dominik, M.; Galianni, P.; Gu, S. -H.; Harpsøe, K. B. W; Haugbølle, Troels; Hinse, T. C.; Hundertmark, M.; Juncher, D.; Korhonen, H.; Liebig, C.; Mancini, L.; Popovas, A.; Rabus, M.; Rahvar, S.; Scarpetta, G.; Schmidt, R. W.; Snodgrass, C.; Southworth, J.; Starkey, D.; Street, R. A.; Surdej, J.; Wang, X. -B.; Wertz, O.

In: Astronomy & Astrophysics, Vol. 573, A103, 2015.

Research output: Contribution to journalJournal articleResearchpeer-review

Harvard

Skottfelt, J, Bramich, DM, Jaimes, RF, Jørgensen, UG, Kains, N, Ferro, AA, Alsubai, KA, Bozza, V, Novati, SC, Ciceri, S, D'Ago, G, Dominik, M, Galianni, P, Gu, S-H, Harpsøe, KBW, Haugbølle, T, Hinse, TC, Hundertmark, M, Juncher, D, Korhonen, H, Liebig, C, Mancini, L, Popovas, A, Rabus, M, Rahvar, S, Scarpetta, G, Schmidt, RW, Snodgrass, C, Southworth, J, Starkey, D, Street, RA, Surdej, J, Wang, X-B & Wertz, O 2015, 'Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations' Astronomy & Astrophysics, vol. 573, A103. https://doi.org/10.1051/0004-6361/201424967

APA

Skottfelt, J., Bramich, D. M., Jaimes, R. F., Jørgensen, U. G., Kains, N., Ferro, A. A., ... Wertz, O. (2015). Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations. Astronomy & Astrophysics, 573, [A103]. https://doi.org/10.1051/0004-6361/201424967

Vancouver

Skottfelt J, Bramich DM, Jaimes RF, Jørgensen UG, Kains N, Ferro AA et al. Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations. Astronomy & Astrophysics. 2015;573. A103. https://doi.org/10.1051/0004-6361/201424967

Author

Skottfelt, Jesper ; Bramich, D. M. ; Jaimes, R. Figuera ; Jørgensen, U. G. ; Kains, N. ; Ferro, A. Arellano ; Alsubai, K. A. ; Bozza, V. ; Novati, S. Calchi ; Ciceri, S. ; D'Ago, G. ; Dominik, M. ; Galianni, P. ; Gu, S. -H. ; Harpsøe, K. B. W ; Haugbølle, Troels ; Hinse, T. C. ; Hundertmark, M. ; Juncher, D. ; Korhonen, H. ; Liebig, C. ; Mancini, L. ; Popovas, A. ; Rabus, M. ; Rahvar, S. ; Scarpetta, G. ; Schmidt, R. W. ; Snodgrass, C. ; Southworth, J. ; Starkey, D. ; Street, R. A. ; Surdej, J. ; Wang, X. -B. ; Wertz, O. / Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations. In: Astronomy & Astrophysics. 2015 ; Vol. 573.

Bibtex

@article{289e319fd8244caf96537b42cb549e08,
title = "Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations",
abstract = "In this paper, we present the analysis of time-series observations from 2013 and 2014 of five metal rich ([Fe/H] $>$ -1) globular clusters: NGC~6388, NGC~6441, NGC~6528, NGC~6638, and NGC~6652. The data have been used to perform a census of the variable stars in the central parts of these clusters. The observations were made with the electron multiplying CCD (EMCCD) camera at the Danish 1.54m Telescope at La Silla, Chile, and they were analysed using difference image analysis (DIA) to obtain high-precision light curves of the variable stars. It was possible to identify and classify all of the previously known or suspected variable stars in the central regions of the five clusters. Furthermore, we were able to identify, and in most cases classify 48, 49, 7, 8, and 2 previously unknown variables in NGC~6388, NGC~6441, NGC~6528, NGC~6638, and NGC~6652, respectively. Especially interesting is the case of NGC~6441, for which the variable star population of about 150 stars has been thoroughly examined by previous studies, including a Hubble Space Telescope study. In this paper we are able to present 49 new variable stars for this cluster, of which one (possibly two) are RR Lyrae stars, two are W Virginis stars, and the rest are long period semi-regular/irregular variables on the red giant branch. We have also detected the first double mode RR Lyrae in the cluster.",
keywords = "astro-ph.SR",
author = "Jesper Skottfelt and Bramich, {D. M.} and Jaimes, {R. Figuera} and J{\o}rgensen, {U. G.} and N. Kains and Ferro, {A. Arellano} and Alsubai, {K. A.} and V. Bozza and Novati, {S. Calchi} and S. Ciceri and G. D'Ago and M. Dominik and P. Galianni and Gu, {S. -H.} and Harps{\o}e, {K. B. W} and Troels Haugb{\o}lle and Hinse, {T. C.} and M. Hundertmark and D. Juncher and H. Korhonen and C. Liebig and L. Mancini and A. Popovas and M. Rabus and S. Rahvar and G. Scarpetta and Schmidt, {R. W.} and C. Snodgrass and J. Southworth and D. Starkey and Street, {R. A.} and J. Surdej and Wang, {X. -B.} and O. Wertz",
year = "2015",
doi = "10.1051/0004-6361/201424967",
language = "English",
volume = "573",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "E D P Sciences",

}

RIS

TY - JOUR

T1 - Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations

AU - Skottfelt, Jesper

AU - Bramich, D. M.

AU - Jaimes, R. Figuera

AU - Jørgensen, U. G.

AU - Kains, N.

AU - Ferro, A. Arellano

AU - Alsubai, K. A.

AU - Bozza, V.

AU - Novati, S. Calchi

AU - Ciceri, S.

AU - D'Ago, G.

AU - Dominik, M.

AU - Galianni, P.

AU - Gu, S. -H.

AU - Harpsøe, K. B. W

AU - Haugbølle, Troels

AU - Hinse, T. C.

AU - Hundertmark, M.

AU - Juncher, D.

AU - Korhonen, H.

AU - Liebig, C.

AU - Mancini, L.

AU - Popovas, A.

AU - Rabus, M.

AU - Rahvar, S.

AU - Scarpetta, G.

AU - Schmidt, R. W.

AU - Snodgrass, C.

AU - Southworth, J.

AU - Starkey, D.

AU - Street, R. A.

AU - Surdej, J.

AU - Wang, X. -B.

AU - Wertz, O.

PY - 2015

Y1 - 2015

N2 - In this paper, we present the analysis of time-series observations from 2013 and 2014 of five metal rich ([Fe/H] $>$ -1) globular clusters: NGC~6388, NGC~6441, NGC~6528, NGC~6638, and NGC~6652. The data have been used to perform a census of the variable stars in the central parts of these clusters. The observations were made with the electron multiplying CCD (EMCCD) camera at the Danish 1.54m Telescope at La Silla, Chile, and they were analysed using difference image analysis (DIA) to obtain high-precision light curves of the variable stars. It was possible to identify and classify all of the previously known or suspected variable stars in the central regions of the five clusters. Furthermore, we were able to identify, and in most cases classify 48, 49, 7, 8, and 2 previously unknown variables in NGC~6388, NGC~6441, NGC~6528, NGC~6638, and NGC~6652, respectively. Especially interesting is the case of NGC~6441, for which the variable star population of about 150 stars has been thoroughly examined by previous studies, including a Hubble Space Telescope study. In this paper we are able to present 49 new variable stars for this cluster, of which one (possibly two) are RR Lyrae stars, two are W Virginis stars, and the rest are long period semi-regular/irregular variables on the red giant branch. We have also detected the first double mode RR Lyrae in the cluster.

AB - In this paper, we present the analysis of time-series observations from 2013 and 2014 of five metal rich ([Fe/H] $>$ -1) globular clusters: NGC~6388, NGC~6441, NGC~6528, NGC~6638, and NGC~6652. The data have been used to perform a census of the variable stars in the central parts of these clusters. The observations were made with the electron multiplying CCD (EMCCD) camera at the Danish 1.54m Telescope at La Silla, Chile, and they were analysed using difference image analysis (DIA) to obtain high-precision light curves of the variable stars. It was possible to identify and classify all of the previously known or suspected variable stars in the central regions of the five clusters. Furthermore, we were able to identify, and in most cases classify 48, 49, 7, 8, and 2 previously unknown variables in NGC~6388, NGC~6441, NGC~6528, NGC~6638, and NGC~6652, respectively. Especially interesting is the case of NGC~6441, for which the variable star population of about 150 stars has been thoroughly examined by previous studies, including a Hubble Space Telescope study. In this paper we are able to present 49 new variable stars for this cluster, of which one (possibly two) are RR Lyrae stars, two are W Virginis stars, and the rest are long period semi-regular/irregular variables on the red giant branch. We have also detected the first double mode RR Lyrae in the cluster.

KW - astro-ph.SR

U2 - 10.1051/0004-6361/201424967

DO - 10.1051/0004-6361/201424967

M3 - Journal article

VL - 573

JO - Astronomy & Astrophysics

T2 - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - A103

ER -

ID: 127863155