2024MNRAS.527.6888V

Query : 2024MNRAS.527.6888V

2024MNRAS.527.6888V - Mon. Not. R. Astron. Soc., 527, 6888-6912 (2024/January-3)

Zero-age horizontal branch models for -2.5 ≤ [Fe/H] ≤-0.5 and their implications for the apparent distance moduli of globular clusters.

VANDENBERG D.A.

Abstract (from CDS):

Grids of zero-age horizontal branch (ZAHB) models are presented, along with a suitable interpolation code, for -2.5 ≤ [Fe/H] ≤ -0.5, in steps of 0.2 dex, assuming Y = 0.25 and 0.29, [O/Fe] = +0.4 and +0.6, and [m/Fe] = +0.4 for all of the other α-elements. The HB populations of 37 globular clusters (GCs) are fitted to these ZAHBs to derive their apparent distance moduli, (m - M)V. With few exceptions, the best estimates of their reddenings from dust maps are adopted. The distance moduli are constrained using the prediction that (MF606W - MF814W)0 colours of metal-poor, main-sequence stars at $M_{F606W} \mathrel {\rm{{\gt }\lower.5 ex\rm{\sim }}}5.0$ have very little sensitivity to [Fe/H]. Intrinsic (MF336W - MF606W)0 colours of blue HB stars, which provide valuable connections between GCs with exclusively blue HBs and other clusters of similar metallicity that also have red HB components, limit the uncertainties of relative (m - M)V values to within ±0.03-0.04 mag. The ZAHB-based distances agree quite well with the distances derived by Baumgardt & Vasiliev. Their implications for GC ages are briefly discussed. Stellar rotation and mass loss appear to be more important than helium abundance variations in explaining the colour-magnitude diagrams of second-parameter GCs (those with anomalously very blue HBs for their metallicities).

Abstract Copyright: © The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): stars: evolution - Hertzsprung-Russell and colour-magnitude diagrams - stars: horizontal branch - stars: Population II - globular clusters: general

Simbad objects: 40

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Number of rows : 40
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 Cl* NGC 104 WSB V69 EB* 00 22 52.951 -72 03 40.68           ~ 30 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
4 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
5 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 579 0
6 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
7 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
8 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
9 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 616 0
10 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
11 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
12 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
13 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
14 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 485 0
15 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
16 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
17 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
18 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 780 0
19 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
20 NGC 6101 GlC 16 25 48.12 -72 12 07.9           ~ 337 0
21 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
22 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
23 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
24 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
25 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
26 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
27 NGC 6541 GlC 18 08 02.36 -43 42 53.6           ~ 409 0
28 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 317 0
29 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 492 0
30 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
31 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 421 0
32 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
33 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
34 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
35 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
36 NGC 6934 GlC 20 34 11.37 +07 24 16.1           ~ 459 0
37 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 465 0
38 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
39 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
40 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0

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