J/A+A/324/915 Blue stragglers in M3 (Ferraro+ 1997)
HST observations of Blue Stragglers stars in the core of the globular cluster M3
Ferraro F.R., Paltrinieri B., Fusi Pecci F., Cacciari C., Dorman B.,
Rood R.T., Buonanno R., Corsi C.E., Burgarella D., Laget M.
<Astron. Astrophys. 324, 915 (1997)>
=1997A&A...324..915F 1997A&A...324..915F (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Stars, blue ; Photometry, ultraviolet
Mission_Name: HST
Keywords: clusters: globular: M 3 - stars: population II -
stars: blue stragglers
Abstract:
The core of the Galactic Globular Cluster M 3 (NGC 5272) has been
observed with the WFPC2 through the filters F255W, F336W, F555W, and
F814W. Using these observations along with a thorough reanalysis of
earlier catalogs, we have produced a catalog of blue straggler stars
(BSS) spanning the cluster. Earlier studies and the fainter part of
our sample suffer severe selection biases. Our analysis is based on a
more reliable bright global sample of 122 BSS. We confirm earlier
suggestions that the radial BSS distribution in M 3 is bimodal. It is
strongly peaked in the center, has a clear dip 100-200" from the
center, and rises again at larger radii. The observed distribution
agrees with the dynamical model of Sigurdsson et al.
(1994ApJ...431L.115S 1994ApJ...431L.115S) which takes into account both star collisions
and merging of primordial binaries for the origin of BSS. The observed
luminosity functions of BSS in the inner and outer parts of the
cluster are different. Interpreting these using the models of Bailyn &
Pinsonneault (1995ApJ...439..705B 1995ApJ...439..705B), we suggest that the BSS in the
inner cluster are formed by stellar collisions and those in the outer
cluster from merging primordial binaries.
Objects:
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RA (2000) DE Designation(s)
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13 42.2 +28 23 M 3 = NGC 5272
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 69 72 V,I,U,UV(F255W) photometry of 72 bright BSS in M 3
table3 69 99 V,I,U,UV(F255W) photometry of 99 faint BSS in M 3
table4 70 263 Global sample of 263 BSS in M3
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Byte-by-byte Description of file: table2 table3
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Bytes Format Units Label Explanations
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1- 5 I5 --- Star Star designation (this paper)
9- 14 F6.3 mag Vmag V magnitude
18- 23 F6.3 mag Imag I magnitude
27- 32 F6.3 mag Umag U magnitude
36- 41 F6.3 mag UVmag UV (F255W) magnitude
43- 50 F8.3 arcsec Xpos X coordinate
52- 59 F8.3 arcsec Ypos Y coordinate
62- 68 F7.3 arcsec Dist Distance from the cluster center
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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2- 4 I3 --- BSS BSS designation in the global sample
6- 13 A8 --- Name Original (this or previous papers)
identification number (1)
14 A1 --- n_Name [+] +: BSS in the global bright sample
18- 23 F6.3 mag Vmag V magnitude
25- 32 F8.3 arcsec Xpos X coordinate
34- 41 F8.3 arcsec Ypos Y coordinate
44- 50 F7.3 arcsec Dist Distance from the cluster center
52- 55 I4 --- GYBS ? Identification number in GYBS,
1994AJ....108.1786G 1994AJ....108.1786G
56 A1 --- n_GYBS [no] Note on GYBS (2)
57- 60 I4 --- BHS ? Identification number in BHS,
1993ApJ...408L..89B 1993ApJ...408L..89B
61 A1 --- n_BHS [no] Note on BHS (2)
62- 64 I3 --- BPQ ? Identification number in BPQ,
1995A&A...301..675B 1995A&A...301..675B
65 A1 --- n_BPQ [no] Note on BPQ (2)
67- 69 I3 --- F93 ? Identification number in F93,
1993AJ....106.2324F 1993AJ....106.2324F
70 A1 --- n_F93 [no] Note on F93 (2)
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Note (1): HST: Hubble Space Telescope
F93: Ferraro et al., 1993AJ....106.2324F 1993AJ....106.2324F
S53: Sandage, 1953AJ.....58...61S 1953AJ.....58...61S
BHS: Bolte et al., 1993ApJ...408L..89B 1993ApJ...408L..89B
Note (2): n: BSS candidate is located in the field of view of that survey but
was not identified as a BSS
o: BSS is located out of the field of view
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Acknowledgements: F.R. Ferraro
References:
Bolte et al., BHS =1993ApJ...408L..89B 1993ApJ...408L..89B
Burgarella et al., BPQ =1995A&A...301..675B 1995A&A...301..675B
Ferraro et al., F93 =1993AJ....106.2324F 1993AJ....106.2324F
Guhathakurta et al., GYBS =1994AJ....108.1786G 1994AJ....108.1786G
(End) Patricia Bauer [CDS] 24-Feb-1997