A CCD BVRI color-magnitude study of the globular cluster NGC 5286.
SAMUS N., IPATOV A., SMIRNOV O., KRAVTSOV V., ALCAINO G., LILLER W. and ALVARADO F.
Abstract (from CDS):
We present results of photoelectrically calibrated CCD BVRI photometry of 1391 stars in the globular cluster NGC 5286. The resulting color-magnitude diagrams are the first CCD CMDs ever presented for this cluster, as well as the first CMDs for this cluster reaching beyond the main sequence turn-off. The subgiant, horizontal branch, and upper main sequence parts of the color-magnitude diagram are well represented. The level of the horizontal branch (near the RR Lyrae gap) is V=16.65mag , the main sequence turn-off is observed at V=20.05mag , (B-V)=0.73mag , (V-R)=0.38mag , (V-I)=0.88mag . The 3.4Vmag difference between the turn-off and the horizontal branch is typical of many globular clusters. Comparison with isochrones evidences for moderately high values of metallicity and age of the cluster, in qualitative agreement with the age interpretation of the "second parameter".
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Journal keyword(s):
globular clusters: individual: NGC 5286 - HR diagram
VizieR on-line data:
<Available at CDS (J/A+AS/112/439): table2>
(Ref) Object type as listed in the reference "Ref"
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
quality : flag of quality
E ≥ 10"
D : 1-10" (and some old data)
C : 0.1-1"
B : 0.01-0.1" + 2MASS, Tyc
A : VLBI, Hipparcos
bibcode : bibcode of the coordinates reference
FK4
coord.
(ep=B1950 eq=1950) :
13 43 16.27 -51 07 27.9
[
]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
ra dec : right ascension and declination (unit and frame defined according to your Output Options)
Grey values are increasing the original precision due to the computation of frame transformations
(wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
[error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
position angle (in degrees North celestial pole to East)
quality : flag of quality
E ≥ 10"
D : 1-10" (and some old data)
C : 0.1-1"
B : 0.01-0.1" + 2MASS, Tyc
A : VLBI, Hipparcos
bibcode : bibcode of the coordinates reference
Gal
coord.
(ep=J2000) :
311.61419 +10.56780
[
]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
[error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
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quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
References (447 between 1850 and 2024) (Total 447)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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