2022MNRAS.511..341C

Query : 2022MNRAS.511..341C

2022MNRAS.511..341C - Mon. Not. R. Astron. Soc., 511, 341-355 (2022/March-3)

Deriving ages and horizontal branch properties of integrated stellar populations.

CABRERA-ZIRI I. and CONROY C.

Abstract (from CDS):

A major source of uncertainty in the age determination of old (∼10 Gyr) integrated stellar populations is the presence of hot horizontal branch (HB) stars. Here, we describe a simple approach to tackle this problem, and show the performance of this technique that simultaneously models the age, abundances, and HB properties of integrated stellar populations. For this, we compare the results found during the fits of the integrated spectra of a sample of stellar population benchmarks, against the values obtained from the analysis of their resolved colour-magnitude diagrams (CMDs). We find that the ages derived from our spectral fits for most (26/32) of our targets are within 0.1 dex to their CMDs values. Similarly, for the majority of the targets in our sample we are able to recover successfully the flux contribution from hot HB stars (within ∼0.15 dex for 18/24 targets) and their mean temperature (14/24 targets within ∼30 per cent). Finally, we present a diagnostic that can be used to detect spurious solutions in age, that will help identify the few cases when this method fails. These results open a new window for the detailed study of globular clusters beyond the Local Group.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): stars: general - globular clusters: general - galaxies: star clusters: general - galaxies: stellar content

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 ESO 28-19 Cl* 00 24 45.98 -72 47 37.9   11.6 12.05     ~ 152 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
5 NGC 411 Cl* 01 07 55.64 -71 46 03.1 13.05 12.63 12.10   11.11 ~ 107 0
6 NGC 416 Cl* 01 07 59.03 -72 21 20.5 12.73 12.55 11.76   10.71 ~ 156 1
7 NGC 419 OpC 01 08 17.26 -72 53 01.8 11.41 11.16 10.50   9.34 ~ 287 0
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
9 NGC 1831 GlC 05 06 16.12 -64 55 06.9   11.52 11.18     ~ 167 0
10 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
11 NGC 1868 GlC 05 14 36.60 -63 57 25.7           ~ 123 0
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
13 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
14 NGC 1978 GlC 05 28 45.330 -66 14 12.04   10.7 10.70     ~ 317 0
15 NGC 2298 GlC 06 48 59.41 -36 00 19.1     8.89     ~ 547 0
16 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
17 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
18 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 485 0
19 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
20 NGC 5927 GlC 15 28 00.69 -50 40 22.9           ~ 499 0
21 NGC 5946 GlC 15 35 28.58 -50 39 35.0           ~ 210 0
22 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
23 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
24 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
25 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
26 NGC 6235 GlC 16 53 25.36 -22 10 38.8   11.99 7.20     ~ 208 0
27 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
28 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
29 NGC 6284 GlC 17 04 28.747 -24 45 51.22   10.72 7.43     ~ 302 0
30 NGC 6304 GlC 17 14 32.25 -29 27 43.3           ~ 394 0
31 NGC 6342 GlC 17 21 10.14 -19 35 14.7     10.01     ~ 310 0
32 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 425 0
33 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
34 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
35 NGC 6544 GlC 18 07 20.58 -24 59 50.4   11.36 9.90     ~ 332 0
36 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
37 NGC 6638 GlC 18 30 56.25 -25 29 47.1   10.81 9.68     ~ 258 0
38 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 492 0
39 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
40 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
41 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
42 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
43 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
44 NAME Galactic Bulge reg ~ ~           ~ 4794 0
45 NAME Local Group GrG ~ ~           ~ 9325 0

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