J/ApJ/663/267 Blue straggler population of globular cluster M5 (Lanzoni+, 2007)
The blue straggler population of the globular cluster M5.
Lanzoni B., Dalessandro E., Ferraro F.R., Mancini C., Beccari G.,
Rood R.T., Mapelli M., Sigurdsson S.
<Astrophys. J., 663, 267-276 (2007)>
=2007ApJ...663..267L 2007ApJ...663..267L
ADC_Keywords: Clusters, globular ; Stars, blue ; Photometry, HST
Keywords: binaries: general - blue stragglers -
globular clusters: individual (M5) - stars: evolution
Abstract:
By combining high-resolution HST and wide-field ground-based
observations, in ultraviolet and optical bands, we study the blue
straggler star (BSS) population of the galactic globular cluster M5
(NGC 5904) from its very central regions up to its periphery. The BSS
distribution is highly peaked in the cluster center, decreases at
intermediate radii and rises again outward. Such a bimodal
distribution is similar to those previously observed in other globular
clusters (M3, 47 Tucanae, NGC 6752). As for these clusters, dynamical
simulations suggest that, while the majority of BSSs in M5 could be
originated by stellar collisions, a significant fraction (20%-40%) of
BSSs generated by mass transfer processes in primordial binaries is
required to reproduce the observed radial distribution. A candidate
BSS has been detected beyond the cluster tidal radius. If confirmed,
this could represent an interesting case of an "evaporating" BSS.
Description:
The present study is based on a combination of two different
photometric data sets.
The high-resolution set consists of a series of ultraviolet (UV) and
optical images of the cluster center obtained with HST WFPC2
(Prop. 6607; PI: Ferraro).
The wide-field set consists of a complementary set of wide-field B and
V images was secured by using the Wide Field Imager (WFI) at the 2.2m
ESO-MPI telescope during an observing run in 2000 April.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 60 The blue straggler population of M5
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See also:
J/ApJ/648/1026 : HST photometry of M5 blue stragglers (Warren+, 2006)
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- 6 I2 --- BSS BSS number (1)
9- 19 F11.7 deg RAdeg Right ascension in decimal degrees (J2000)
21- 29 F9.7 deg DEdeg Declination in decimal degrees (J2000)
31- 35 F5.2 mag m255 ?=- UV m255 magnitude
37- 41 F5.2 mag Umag ?=- HST U magnitude
43- 47 F5.2 mag Bmag ?=- HST B magnitude
49- 53 F5.2 mag Vmag ?=- HST V magnitude
55- 59 F5.2 mag Imag ?=- HST I magnitude
61- 64 A4 --- W06 Name in Warren et al. (2006,
Cat. J/ApJ/648/1026) (2)
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Note (1): The first 41 BSSs have been identified in the WFPC2 sample; BSSs
42-46 are from the complementary ACS observations; BSSs47-59 are from
the WFI data set. BSS 59 lies beyond the cluster tidal radius, at ∼24'
from the center. Sources identified as Cl* NGC 5904 LDF NN in Simbad.
Note (2): "CR" indicating their "core BSSs" (Cl* NGC 5904 BBSS CNN in
Simbad) and "OR" indicating their "outer region BSSs"
(Cl* NGC 5904 BBSS GNN in Simbad).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Aug-2009