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High-resolution optical imaging of the core of the globular cluster M15 with FastCam

Díaz-Sánchez, Anastasio and Pérez-Garrido, Antonio and Villó, Isidro and Rebolo, Rafael and Pérez-Prieto, Jorge A. and Oscoz, Alejandro and Hildebrandt, Sergi R. and López, Roberto and Rodríguez, Luis F. (2012) High-resolution optical imaging of the core of the globular cluster M15 with FastCam. Monthly Notices of the Royal Astronomical Society, 423 (3). pp. 2260-2269. ISSN 0035-8711. doi:10.1111/j.1365-2966.2012.21034.x.

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We present high-resolution I-band imaging of the core of the globular cluster M15 obtained at the 2.5-m Nordic Optical Telescope with FastCam, a low readout noise L3CCD-based instrument. Short exposure times (30ms) were used to record 200 000 images (512×512 pixels each) over a period of 2 h and 43 min. The lucky imaging technique was then applied to generate a final image of the cluster centre with full width at half-maximum ∼0.1 arcsec and 13 × 13 arcsec^2 field of view. We obtained a catalogue of objects in this region with a limiting magnitude of I = 19.5. I-band photometry and astrometry are reported for 1181 stars. This is the deepest I-band observation of the M15 core at this spatial resolution. Simulations show that crowding is limiting the completeness of the catalogue. At shorter wavelengths, a similar number of objects have been reported using Hubble Space Telescope (HST)/Wide Field Planetary Camera observations of the same field. The cross-match with the available HST catalogues allowed us to produce colour–magnitude diagrams where we identify new blue straggler star candidates and previously known stars of this class.

Item Type:Article
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URLURL TypeDescription
Rebolo, Rafael0000-0003-3767-7085
Rodríguez, Luis F.0000-0003-2737-5681
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2012 April 2. Received 2012 April 2; in original form 2011 July 5. Article first published online: 7 May 2012. We thank the Nordic Optical Telescope staff and the Instrument Maintenance team of the IAC for their support during the observations. Based on observations made with the Nordic Optical Telescope operated on the island of La Palma by the NOTSA in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrof´ısica de Canarias. This research has been supported by Project No. 15345/PI/10 from the Fundaci´on S´eneca and the Spanish Ministry of Economy and Competitiveness (MINECO) under the grant AYA2010-21308-C03-03. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. This work is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract.
Funding AgencyGrant Number
Fundación Séneca15345/PI/10
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2010-21308-C03-03
Subject Keywords:instrumentation: high angular resolution; techniques: photometric; binaries: close; blue stragglers; Hertzsprung–Russell and colour–magnitude diagrams; globular clusters: individual: M15
Issue or Number:3
Record Number:CaltechAUTHORS:20120724-125426129
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Official Citation:Díaz-Sánchez, A., Pérez-Garrido, A., Villó, I., Rebolo, R., Pérez-Prieto, J. A., Oscoz, A., Hildebrandt, S. R., López, R. and Rodríguez, L. F. (2012), High-resolution optical imaging of the core of the globular cluster M15 with FastCam. Monthly Notices of the Royal Astronomical Society, 423: 2260–2269. doi: 10.1111/j.1365-2966.2012.21034.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32679
Deposited By: Aucoeur Ngo
Deposited On:24 Jul 2012 22:14
Last Modified:09 Nov 2021 21:29

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