St Andrews Research Repository

St Andrews University Home
View Item 
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

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

Thumbnail
View/Open
Jaimes_2015_A_A_Searching.pdf (4.666Mb)
Date
01/2015
Author
Skottfelt, J.
Bramich, D. M.
Figuera Jaimes, R.
Jørgensen, U. G.
Kains, N.
Arellano Ferro, A.
Alsubai, K. A.
Bozza, V.
Calchi Novati, S.
Ciceri, S.
D'Ago, G.
Dominik, M.
Galianni, P.
Gu, S.-H.
Harpsøe, K. B. W.
Haugbølle, T.
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 (The Mindstep Consortium), O.
Keywords
Globular clusters: individual:
Stars: variables: RR Lyrae
Stars: variables: general
Instrumentation: high angular resolution
QC Physics
3rd-DAS
Metadata
Show full item record
Abstract
Aims. 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. Methods. The observations were made with the electron-multiplying charge-couple device (EMCCD) camera at the Danish 1.54 m Telescope at La Silla, Chile, and they were analysed using difference image analysis to obtain high-precision light curves of the variable stars. Results. 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 or irregular variables on the red giant branch. We have also detected the first double-mode RR Lyrae in the cluster.
Citation
Skottfelt , J , Bramich , D M , Figuera Jaimes , R , Jørgensen , U G , Kains , N , Arellano Ferro , A , Alsubai , K A , Bozza , V , Calchi Novati , S , Ciceri , S , D'Ago , G , Dominik , M , Galianni , P , Gu , S-H , Harpsøe , K B W , Haugbølle , T , 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 (The Mindstep Consortium) , O 2015 , ' Searching for variable stars in the cores of five metal-rich globular clusters using EMCCD observations ' , Astronomy & Astrophysics , vol. 573 . https://doi.org/10.1051/0004-6361/201424967
Publication
Astronomy & Astrophysics
Status
Peer reviewed
DOI
https://doi.org/10.1051/0004-6361/201424967
ISSN
0004-6361
Type
Journal article
Rights
Reproduced with permission from Astronomy & Astrophysics, © ESO 2015. This work is made available online in accordance with the publisher’s policies. The final published version of this work is available at http://dx.doi.org/10.1051/0004-6361/201424967
Description
D.M.B. and K.A.A. acknowledge support from NPRP grant # X-019-1-006 from the Qatar National Research Fund (a member of Qatar Foundation). A.A.F. acknowledges the support from DGAPA-UNAM grant through project IN104612. K.A.A., C.L., M.D., K.H. and M.H. acknowledge grant NPRP-09-476-1-78 from the Qatar National Research Fund (a member of Qatar Foundation). CS has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement No. 268421. S.H.G. and X.B.W. would like to thank the financial support from National Natural Science Foundation of China through grants Nos. 10373023, 10773027 and 11333006. T.H. is supported by a Sapere Aude Starting Grant from The Danish Council for Independent Research. T.C.H. 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. H.K. acknowledges the support from the European Commission under the Marie Curie IEF Programme in FP7. M.R. acknowledges support from FONDECYT postdoctoral fellowship No. 3120097. O.W. (FNRS research fellow) and J. Surdej acknowledge support from the Communauté francaise de Belgique - Actions de recherche concertées – Académie Wallonie-Europe. Date of Acceptance: 31/10/2014
Collections
  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2015A%26A...573A.103S
URI
http://hdl.handle.net/10023/6109

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

Advanced Search

Browse

All of RepositoryCommunities & CollectionsBy Issue DateNamesTitlesSubjectsClassificationTypeFunderThis CollectionBy Issue DateNamesTitlesSubjectsClassificationTypeFunder

My Account

Login

Open Access

To find out how you can benefit from open access to research, see our library web pages and Open Access blog. For open access help contact: openaccess@st-andrews.ac.uk.

Accessibility

Read our Accessibility statement.

How to submit research papers

The full text of research papers can be submitted to the repository via Pure, the University's research information system. For help see our guide: How to deposit in Pure.

Electronic thesis deposit

Help with deposit.

Repository help

For repository help contact: Digital-Repository@st-andrews.ac.uk.

Give Feedback

Cookie policy

This site may use cookies. Please see Terms and Conditions.

Usage statistics

COUNTER-compliant statistics on downloads from the repository are available from the IRUS-UK Service. Contact us for information.

© University of St Andrews Library

University of St Andrews is a charity registered in Scotland, No SC013532.

  • Facebook
  • Twitter