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Query : 1999MNRAS.308..818G |
1999MNRAS.308..818G - Mon. Not. R. Astron. Soc., 308, 818-832 (1999/September-3)
A secondary clump of red giant stars: why and where.
GIRARDI L.
Abstract (from CDS):
In this paper, we go into more detail about the origin and properties of this feature. We first compare the clump theoretical models with data for clusters of different ages and metallicities, basically confirming the predicted behaviour. We then refine the previous models in order to show the following behaviour. (i) The faint extension is expected to be clearly separated from the main clump in the CMD of metal-rich populations, defining a `secondary clump' by itself. (ii) It should be present in all galactic fields containing ∼1Gyr old stars and with mean metallicities higher than about Z=0.004. (iii) It should be particularly strong, if compared with the main red clump, in galaxies that have increased their star formation rate in the last Gyr or so of their evolution. In fact, secondary clumps similar to the model predictions are observed in the CMD of nearby stars from Hipparcos data, and in those of some Large Magellanic Cloud fields observed to date. There are also several reasons why this secondary clump may be missing or hidden in other observed CMDs of galaxy fields. For instance, it becomes indistinguishable from the main clump if the photometric errors or differential absorption are larger than about 0.2mag. None the less, this structure may provide important constraints on the star formation history of Local Group galaxies. We comment also on the intrinsic luminosity variation and dispersion of clump stars, which may limit their use as either absolute or relative distance indicators, respectively.
Abstract Copyright: 1999 Blackwell Science Ltd
Journal keyword(s): stars: evolution - Hertzsprung-Russell (HR) diagram - stars: horizontal branch - stars: luminosity function, mass function - Magellanic Clouds - galaxies: stellar content
Simbad objects: 31
Number of rows : 31 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Cl Lindsay 1 | Cl* | 00 03 53.50 | -73 28 15.0 | 11.7 | ~ | 118 | 0 | ||||
2 | ESO 28-19 | Cl* | 00 24 45.98 | -72 47 37.9 | 11.6 | 12.05 | ~ | 147 | 0 | |||
3 | NGC 121 | GlC | 00 26 49.0 | -71 32 10 | 11.2 | 11.24 | ~ | 309 | 0 | |||
4 | ESO 28-22 | OpC | 00 27 45.17 | -72 46 52.5 | 14.78 | 14.75 | 13.95 | 12.75 | ~ | 49 | 0 | |
5 | NAME SMC | BL? | 00 52 38.0 | -72 48 01 | 2.79 | 2.2 | ~ | 11103 | 1 | |||
6 | NGC 339 | OpC | 00 57 47.62 | -74 28 14.6 | 13.23 | 12.94 | 12.21 | 11.20 | ~ | 143 | 0 | |
7 | NGC 411 | Cl* | 01 07 55.64 | -71 46 03.1 | 13.05 | 12.63 | 12.10 | 11.11 | ~ | 104 | 0 | |
8 | NGC 416 | Cl* | 01 07 59.03 | -72 21 20.5 | 12.73 | 12.55 | 11.76 | 10.71 | ~ | 146 | 1 | |
9 | NGC 419 | OpC | 01 08 17.26 | -72 53 01.8 | 11.41 | 11.16 | 10.50 | 9.34 | ~ | 271 | 0 | |
10 | Cl Lindsay 113 | Cl* | 01 49 30.0 | -73 43 40 | 11.9 | ~ | 90 | 0 | ||||
11 | NGC 752 | OpC | 01 56 53.5 | +37 47 38 | ~ | 640 | 0 | |||||
12 | NGC 1756 | GlC | 04 54 49.130 | -69 14 10.20 | 12.64 | 12.24 | ~ | 30 | 0 | |||
13 | NGC 1831 | GlC | 05 06 16.12 | -64 55 06.9 | 11.52 | 11.18 | ~ | 163 | 0 | |||
14 | NGC 1868 | GlC | 05 14 36.60 | -63 57 25.7 | 12.02 | 11.57 | ~ | 121 | 0 | |||
15 | ESO 85-72 | Cl* | 05 20 05.61 | -63 28 49.2 | 14.58 | 13.85 | ~ | 28 | 0 | |||
16 | NAME LMC | G | 05 23 34.6 | -69 45 22 | 0.4 | ~ | 17359 | 1 | ||||
17 | NGC 1987 | GlC | 05 27 16.940 | -70 44 14.16 | 12.1 | ~ | 92 | 0 | ||||
18 | ESO 85-91 | Cl* | 05 29 48.11 | -63 38 59.2 | 13.96 | 13.23 | ~ | 25 | 0 | |||
19 | ESO 86-22 | Cl* | 05 42 29.090 | -65 21 46.33 | 13.8 | ~ | 43 | 0 | ||||
20 | NGC 2107 | Cl* | 05 43 12.270 | -70 38 26.83 | 11.89 | 11.51 | ~ | 49 | 0 | |||
21 | NGC 2108 | GlC | 05 43 56.270 | -69 10 54.37 | 12.90 | 12.32 | ~ | 67 | 0 | |||
22 | NGC 2121 | Cl* | 05 48 13.190 | -71 28 52.00 | 13.21 | 12.37 | ~ | 132 | 0 | |||
23 | NGC 2173 | GlC | 05 57 58 | -72 58.7 | 12.74 | 11.88 | ~ | 141 | 0 | |||
24 | NGC 2155 | Cl* | 05 58 32.070 | -65 28 38.62 | 13.41 | 12.60 | ~ | 106 | 0 | |||
25 | NGC 2162 | GlC | 06 00 30.21 | -63 43 18.2 | 13.38 | 12.70 | ~ | 78 | 0 | |||
26 | NGC 2190 | GlC | 06 01 02 | -74 43.6 | 13.57 | 12.94 | ~ | 42 | 0 | |||
27 | ESO 121-3 | Cl* | 06 02 03.32 | -60 31 25.6 | 14.91 | 14.04 | ~ | 114 | 0 | |||
28 | NGC 2209 | GlC | 06 08 36.06 | -73 50 07.9 | 13.58 | 13.15 | ~ | 114 | 0 | |||
29 | ESO 57-75 | Cl* | 06 13 27.3 | -70 41 42 | 14.41 | 13.67 | ~ | 42 | 0 | |||
30 | NGC 2249 | GlC | 06 25 49 | -68 55.2 | 12.66 | 12.23 | ~ | 72 | 0 | |||
31 | * bet LMi | SB* | 10 27 52.9995995 | +36 42 25.956038 | 5.76 | 5.11 | 4.21 | 3.52 | 3.06 | G9III | 219 | 0 |
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