2011A&A...527A..59C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:35:02

2011A&A...527A..59C - Astronomy and Astrophysics, volume 527A, 59-59 (2011/3-1)

The magnitude difference between the main sequence turn off and the red giant branch bump in Galactic globular clusters.

CASSISI S., MARIN-FRANCH A., SALARIS M., APARICIO A., MONELLI M. and PIETRINFERNI A.

Abstract (from CDS):

We present new measurements of the magnitude of the main sequence turn off and the red giant branch bump in the luminosity function of a sample of Galactic globular clusters with updated estimates of [Fe/H] and [α/Fe], employing photometric data collected with the Advanced Camera for Survey onboard the HST. We compare measured and predicted values of the magnitude difference between these two features, a rarely employed diagnostic of the internal structure of low-mass stars at the beginning of their red giant evolution. Our analysis discloses a clear discrepancy between theory and observations, because the theoretical red giant branch bump magnitudes are too bright by on average ∼0.2mag. This corroborates results from the more widely studied magnitude difference between horizontal branch and red giant bump, avoiding the well known problems associated with determining the horizontal branch level from colour-magnitude diagrams and with uncertainties in the luminosity of horizontal branch stellar models. We briefly discuss several potential solutions of this discrepancy.

Abstract Copyright:

Journal keyword(s): stars: general - Hertzsprung-Russell and C-M diagrams - stars: low-mass - stars: luminosity function, mass function - stars: Population II - globular clusters: general

Simbad objects: 13

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Number of rows : 13

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 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3547 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 938 0
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1241 0
4 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1771 0
5 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 617 0
6 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 579 0
7 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 683 0
8 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1904 0
9 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 321 1
10 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 405 1
11 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 430 0
12 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1806 0
13 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-14:35:02

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