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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 123 The Blue Straggler Star (BSS) population of M2
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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
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Bytes Format Units Label Explanations
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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
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Note (1): Cl* NGC 7089 DBL NNN in Simbad
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Jan-2010