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J/ApJS/182/509            Blue stragglers in M2             (Dalessandro+, 2009)

Multiwavelength photometry in the globular cluster M2. Dalessandro E., Beccari G., Lanzoni B., Ferraro F.R., Schiavon R., Rood R.T. <Astrophys. J. Suppl. Ser., 182, 509-518 (2009)> =2009ApJS..182..509D
ADC_Keywords: Clusters, globular ; Photometry ; Stars, blue Keywords: binaries: general - blue stragglers - stars: evolution globular clusters: individual (M2) Abstract: We present a multiwavelength photometric analysis of the globular cluster M2. The data set has been obtained by combining high-resolution (Hubble Space Telescope/WFPC2 and ACS) and wide-field (Galaxy Evolution Explorer) space observations and ground-based (MEGACAM-CFHT, EMMI-NTT) images. The photometric sample covers the entire cluster extension from the very central regions up to the tidal radius and beyond. It allows an accurate determination of the cluster center of gravity and other structural parameters derived from the star count density profile. Moreover, we study the Blue Straggler Star (BSS) population and its radial distribution. A total of 123 BSSs have been selected, and their radial distribution has been found to be bimodal (highly peaked in the center, decreasing at intermediate radii, and rising outward), as already found in a number of other clusters. We also searched for gradients in the red giant branch (RGB) and the asymptotic giant branch (AGB) populations. Description: The present work is based on a combination of different high-resolution and wide-field data sets. The high-resolution set consists of a series of WFPC2 and ACS images taken at various wavelengths ranging from the UV to the optical bands. The wide-field set is composed of data obtained with three different instruments (MEGACAM-CFHT, EMMI-ESO-NTT,GALEX). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 72 123 The Blue Straggler Star (BSS) population of M2
See also: J/A+A/324/915 : Blue stragglers in M3 (Ferraro+ 1997) J/AJ/117/2868 : BV photometry in M2 (NGC 7089) (Lee+, 1999) J/ApJ/663/267 : M5 blue straggler population M5 (Lanzoni+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [BSS] 5- 7 I3 --- BSS Source name (1) 9- 19 F11.7 deg RAdeg Right Ascension in decimal degrees (J2000) 21- 30 F10.7 deg DEdeg Declination in decimal degrees (J2000) 32- 37 F6.3 mag m255 ? HST/WFPC2 m255 band magnitude 39- 44 F6.3 mag Umag ? U band magnitude 46- 51 F6.3 mag Bmag ? B band magnitude 53- 58 F6.3 mag Vmag ? V band magnitude 60- 65 F6.3 mag Imag ? I band magnitude 67- 72 F6.3 mag rmag ? r band magnitude
Note (1): Cl* NGC 7089 DBL NNN in Simbad
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Jan-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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