2009A&A...503..755M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST22:42:52

2009A&A...503..755M - Astronomy and Astrophysics, volume 503, 755-764 (2009/9-1)

The radial distribution of the two stellar populations in NGC 1851.

MILONE A.P., STETSON P.B., PIOTTO G., BEDIN L.R., ANDERSON J., CASSISI S. and SALARIS M.

Abstract (from CDS):

We have analyzed ACS/WFC and WFPC2 images from HST, as well as ground-based data to study the radial distribution of the double sub-giant branch (SGB) recently discovered in the Galactic globular cluster NGC 1851. We found that the SGB split can be followed all the way from the cluster center out to at least 8' from the center. Beyond this distance out to the tidal radius at ∼11.7arcmin, there are simply too few SGB stars to identify the sequences. The number ratio of the bright SGB to the faint SGB stars shows no significant radial trend. Furthermore, we have found that the ratio of blue horizontal-branch (HB) stars plus RR Lyrae to the red HB stars also remains constant from the cluster center to the outer envelope.

Abstract Copyright:

Journal keyword(s): stars: Hertzsprung-Russell (HR) and C-M diagrams - stars: Population II

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1241 0
2 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2997 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-22:42:52

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