Query : 1997A&A...320..757F

1997A&A...320..757F - Astronomy and Astrophysics, volume 320, 757-775 (1997/4-3)

The stellar population of the globular cluster M 3. II. CCD photometry of additional 10,000 stars.


Abstract (from CDS):

We present BVI CCD photometry for more than 10,000 stars in the innermost region (0.3'<r≲4') of the globular cluster M 3. When added to the previous photographic photometry by Buonanno et al. (1994A&A...290...69B) reaching as far as r∼7', this results in an homogeneous data-set including about 19,000 stars measured in this cluster, which can be now regarded as one of the main templates for stellar population studies. Our main results, from the new colour-magnitude diagrams (CMD), are: (o) Completeness has been achieved for all objects at V≤18.6 and 0.3'<r<7'. (o) Our new independent photometric calibration is redder than the old calibration (Sandage and Katem 1982AJ.....87..537S) in the blue range, and bluer in the reddest part of the CMD. This colour term has important consequences on some issues (e.g. metallicity, period-shift effect, etc.). (o) The metallicity derived from the photometric indicators (B-V)0,g and {DELTA}V1.4 is [Fe/H]~-1.45, i.e. significantly higher than the value -1.66 generally used so far. This is in very good agreement with the most recent high resolution spectroscopic studies of individual stars. (o) There is indication of the presence of a very faint and blue extension of the HB, although scarcely populated. (o) The population ratios of HB, RGB and AGB stars confirm the value previously found for the helium content, i.e. Y=0.23±0.02. (o) There is a significant population of blue straggler stars, although the exact number must await HST data for a better resolution in the very central regions.

Abstract Copyright:

Journal keyword(s): Galaxy: globular clusters: individual: M 3 - stars: Population II - HR diagram

VizieR on-line data: <Available at CDS (J/A+A/320/757): tables>

Nomenclature: Cl* NGC 5272 FCC NNNNN (Nos 1-20191)

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

CDS comments: The link between this ref. and objects in tables has not been done in SIMBAD

Simbad objects: 6

goto View the references in ADS

Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2174 0
2 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 536 0
3 Cl* NGC 5272 GYB 9 * 13 42 09.424 +28 22 22.33     13.09     ~ 2 0
4 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2374 0
5 Cl* NGC 5272 FCC 12045 * 13 42 13.064 +28 23 10.53     12.82     ~ 2 0
6 Cl* NGC 5272 FCC 10052 * 13 42 15.365 +28 22 40.13     13.35     ~ 2 0

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