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dc.contributor.authorFiguera Jaimes, R.
dc.contributor.authorBramich, D. M.
dc.contributor.authorKains, N.
dc.contributor.authorSkottfelt, J.
dc.contributor.authorJørgensen, U. G.
dc.contributor.authorHorne, K.
dc.contributor.authorDominik, M.
dc.contributor.authorAlsubai, K. A.
dc.contributor.authorBozza, V.
dc.contributor.authorBurgdorf, M. J.
dc.contributor.authorCalchi Novati, S.
dc.contributor.authorCiceri, S.
dc.contributor.authorD'Ago, G.
dc.contributor.authorEvans, D. F.
dc.contributor.authorGalianni, P.
dc.contributor.authorGu, S. H.
dc.contributor.authorHarpsøe, K. B. W
dc.contributor.authorHaugbølle, T.
dc.contributor.authorHinse, T. C.
dc.contributor.authorHundertmark, M.
dc.contributor.authorJuncher, D.
dc.contributor.authorKerins, E.
dc.contributor.authorKorhonen, H.
dc.contributor.authorKuffmeier, M.
dc.contributor.authorMancini, L.
dc.contributor.authorPeixinho, N.
dc.contributor.authorPopovas, A.
dc.contributor.authorRabus, M.
dc.contributor.authorRahvar, S.
dc.contributor.authorScarpetta, G.
dc.contributor.authorSchmidt, R. W.
dc.contributor.authorSnodgrass, C.
dc.contributor.authorSouthworth, J.
dc.contributor.authorStarkey, D.
dc.contributor.authorStreet, R. A.
dc.contributor.authorSurdej, J.
dc.contributor.authorTronsgaard, R.
dc.contributor.authorUnda-Sanzana, E.
dc.contributor.authorvon Essen, C.
dc.contributor.authorWang, X.-B.
dc.contributor.authorWertz, O.
dc.date.accessioned2016-08-04T11:30:04Z
dc.date.available2016-08-04T11:30:04Z
dc.date.issued2016-08
dc.identifier.citationFiguera Jaimes , R , Bramich , D M , Kains , N , Skottfelt , J , Jørgensen , U G , Horne , K , Dominik , M , Alsubai , K A , Bozza , V , Burgdorf , M J , Calchi Novati , S , Ciceri , S , D'Ago , G , Evans , D F , Galianni , P , Gu , S H , Harpsøe , K B W , Haugbølle , T , Hinse , T C , Hundertmark , M , Juncher , D , Kerins , E , Korhonen , H , Kuffmeier , M , Mancini , L , Peixinho , N , Popovas , A , Rabus , M , Rahvar , S , Scarpetta , G , Schmidt , R W , Snodgrass , C , Southworth , J , Starkey , D , Street , R A , Surdej , J , Tronsgaard , R , Unda-Sanzana , E , von Essen , C , Wang , X-B & Wertz , O 2016 , ' Many new variable stars discovered in the core of the globular cluster NGC 6715 (M54) with EMCCD observations ' , Astronomy & Astrophysics , vol. 592 , A120 . https://doi.org/10.1051/0004-6361/201628864en
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 244442229
dc.identifier.otherPURE UUID: 6d13e567-87b9-4c1a-9883-10b6a8d1e256
dc.identifier.otherBibCode: 2016arXiv160506141F
dc.identifier.otherScopus: 84981747067
dc.identifier.otherWOS: 000384722600165
dc.identifier.otherORCID: /0000-0002-3202-0343/work/75996736
dc.identifier.urihttps://hdl.handle.net/10023/9256
dc.description.abstractWe show the benefits of using Electron-Multiplying CCDs and the shift-and-add technique as a tool to minimise the effects of the atmospheric turbulence such as blending between stars in crowded fields and to avoid saturated stars in the fields observed. We intend to complete, or improve, the census of the variable star population in globular cluster NGC~6715. Our aim is to obtain high-precision time-series photometry of the very crowded central region of this stellar system via the collection of better angular resolution images than has been previously achieved with conventional CCDs on ground-based telescopes. Observations were carried out using the Danish 1.54-m Telescope at the ESO La Silla observatory in Chile. The telescope is equipped with an Electron-Multiplying CCD that allowed to obtain short-exposure-time images (ten images per second) that were stacked using the shift-and-add technique to produce the normal-exposure-time images (minutes). The high precision photometry was performed via difference image analysis employing the DanDIA pipeline. We attempted automatic detection of variable stars in the field. We statistically analysed the light curves of 1405 stars in the crowded central region of NGC~6715 to automatically identify the variable stars present in this cluster. We found light curves for 17 previously known variable stars near the edges of our reference image (16 RR Lyrae and 1 semi-regular) and we discovered 67 new variables (30 RR Lyrae, 21 long-period irregular, 3 semi-regular, 1 W Virginis, 1 eclipsing binary, and 11 unclassified). Photometric measurements for these stars are available in electronic form through the Strasbourg Astronomical Data Centre.
dc.format.extent17
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysicsen
dc.rights© 2016, ESO. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at www.aanda.org / https://dx.doi.org/10.1051/0004-6361/201628864en
dc.subjectCrowded fieldsen
dc.subjectGlobular clustersen
dc.subjectNGC 6715, variable starsen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectNDASen
dc.subject.lccQBen
dc.subject.lccQCen
dc.titleMany new variable stars discovered in the core of the globular cluster NGC 6715 (M54) with EMCCD observationsen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.identifier.doihttps://doi.org/10.1051/0004-6361/201628864
dc.description.statusPeer revieweden
dc.identifier.urlhttp://adsabs.harvard.edu/abs/2016arXiv160506141Fen
dc.identifier.grantnumberST/M001296/1en


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