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Query : 2013MNRAS.430..459D |
2013MNRAS.430..459D - Mon. Not. R. Astron. Soc., 430, 459-471 (2013/March-3)
The horizontal branch in the UV colour-magnitude diagrams - II. The case of M3, M13 and M79.
DALESSANDRO E., SALARIS M., FERRARO F.R., MUCCIARELLI A. and CASSISI S.
Abstract (from CDS):
These systems represents a `classical' example of clusters in the intermediate-metallicity regime that, even sharing similar metal content and age, show remarkably different horizontal branch morphologies. As a consequence, the observed differences in the colour distributions of horizontal branch stars cannot be interpreted in terms of either first (metallicity) or a second parameter such as age.
We investigate here the possible role of variations of initial helium abundance (Y). Thanks to the use of a proper setup of far-UV filters, we are able to put strong constraints on the maximum Y (Ymax) values compatible with the data. We find differences ΔY_max∼0.02
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): stars: evolution - stars: horizontal branch - globular clusters: individual: M3 - globular clusters: individual: M13 - globular clusters: individual: M79 - ultraviolet: stars
Simbad objects: 15
Number of rows : 15 |
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 | NGC 1851 | GlC | 05 14 06.76 | -40 02 47.6 | ~ | 1429 | 0 | |||||
2 | M 79 | GlC | 05 24 10.59 | -24 31 27.3 | 8.16 | ~ | 817 | 0 | ||||
3 | NGC 2808 | GlC | 09 12 03.10 | -64 51 48.6 | ~ | 1419 | 0 | |||||
4 | NGC 5139 | GlC | 13 26 47.28 | -47 28 46.1 | ~ | 3426 | 0 | |||||
5 | M 3 | GlC | 13 42 11.62 | +28 22 38.2 | 6.39 | ~ | 2478 | 0 | ||||
6 | NGC 5927 | GlC | 15 28 00.69 | -50 40 22.9 | ~ | 462 | 0 | |||||
7 | M 80 | GlC | 16 17 02.41 | -22 58 33.9 | ~ | 715 | 0 | |||||
8 | M 4 | GlC | 16 23 35.22 | -26 31 32.7 | ~ | 1849 | 0 | |||||
9 | M 13 | GlC | 16 41 41.634 | +36 27 40.75 | 5.8 | ~ | 2192 | 0 | ||||
10 | M 92 | GlC | 17 17 07.39 | +43 08 09.4 | 6.52 | ~ | 2115 | 0 | ||||
11 | NGC 6388 | GlC | 17 36 17.461 | -44 44 08.34 | ~ | 913 | 1 | |||||
12 | NGC 6397 | GlC | 17 40 42.09 | -53 40 27.6 | 5.17 | ~ | 1975 | 0 | ||||
13 | NGC 6441 | GlC | 17 50 13.06 | -37 03 05.2 | ~ | 884 | 0 | |||||
14 | NGC 6752 | GlC | 19 10 52.11 | -59 59 04.4 | ~ | 2000 | 0 | |||||
15 | M 15 | GlC | 21 29 58.33 | +12 10 01.2 | ~ | 3139 | 0 |
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