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Query : 2000AJ....120.2437S |
2000AJ....120.2437S - Astron. J., 120, 2437-2459 (2000/November-0)
Hubble space telescope WFPC2 photometry of M33: properties of the halo star clusters and surrounding fields.
SARAJEDINI A., GEISLER D., SCHOMMER R. and HARDING P.
Abstract (from CDS):
Eight of the 10 M33 halo clusters possess HBs that are located entirely redward of the RR Lyrae instability strip.
For nine of these clusters, we are able to use the slope of the red giant branch to measure metal abundances; we find their metal abundances to be in the range -1.64≥[Fe/H]≥-0.65 with a mean of <[Fe/H]≥-1.27±0.11.
Utilizing this information, we are able to place these objects in the [Fe/H]-HB type diagram from which we conclude that the halo clusters in M33 suffer from the second-parameter effect; this suggests that another parameter, in addition to metal abundance, is affecting the morphology of their HBs.
We present several arguments in favor of the hypothesis that this second parameter is cluster age. If this is indeed the case, while two of these clusters are likely to be as old as Galactic globular clusters at their metallicity, the remaining seven clusters have a mean age of ∼7 Gyr.
Using the two clusters in which the magnitude of the RR Lyrae variables can be inferred and adopting the RR Lyrae luminosity-metallicity relation favored by Chaboyer, we calculate a distance modulus of (m-M)0=24.84±0.16 for M33.
Our CMDs of the fields onto which the clusters are projected reveal the M33 disk population to be quite complicated. Our main conclusion regarding the disk field stars is that the youngest population is concentrated toward the center of M33.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Formation - Galaxies: Halos - Galaxies: Star Clusters
CDS comments: Table 1 : clusters U,M,H,C are [CS82], clusters R are [HS80].
Simbad objects: 44
Number of rows : 44 |
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 104 | GlC | 00 24 05.359 | -72 04 53.20 | 4.09 | ~ | 3917 | 0 | ||||
2 | NGC 121 | GlC | 00 26 49.0 | -71 32 10 | 11.2 | 11.24 | ~ | 311 | 0 | |||
3 | M 31 | AGN | 00 42 44.330 | +41 16 07.50 | 4.86 | 4.36 | 3.44 | ~ | 12650 | 1 | ||
4 | NGC 188 | OpC | 00 47 11.5 | +85 14 38 | ~ | 922 | 0 | |||||
5 | NAME SMC | G | 00 52 38.0 | -72 48 01 | 2.79 | 2.2 | ~ | 11149 | 1 | |||
6 | NGC 288 | GlC | 00 52 45.24 | -26 34 57.4 | 10 | 8.13 | ~ | 1042 | 0 | |||
7 | NGC 362 | GlC | 01 03 14.26 | -70 50 55.6 | 6.58 | ~ | 1085 | 0 | ||||
8 | CBF 54 | GlC | 01 33 14.2863375672 | +30 28 22.530659808 | 19.362 | 19.129 | 18.323 | 17.752 | 17.258 | ~ | 34 | 0 |
9 | [SSA2010] 1203 | GlC | 01 33 28.6875445368 | +30 41 35.186506296 | 18.092 | 18.042 | 17.286 | 16.846 | 16.379 | ~ | 30 | 0 |
10 | [SSA2010] 1230 | GlC | 01 33 30.70 | +30 22 21.4 | 18.988 | 18.583 | 18.036 | 17.644 | 17.206 | ~ | 24 | 0 |
11 | [SBG2007] 4 | GlC | 01 33 35.0831406456 | +30 49 00.041875644 | 19.988 | 19.447 | 18.373 | 17.692 | 17.099 | ~ | 26 | 0 |
12 | [SSA2010] 1458 | GlC | 01 33 45.10 | +30 47 46.7 | 17.210 | 17.081 | 16.298 | 15.823 | 15.311 | ~ | 38 | 0 |
13 | M 33 | GiG | 01 33 50.8965749232 | +30 39 36.630403128 | 6.17 | 6.27 | 5.72 | ~ | 5838 | 1 | ||
14 | [SSA2010] 1566 | GlC | 01 33 52.20 | +30 29 03.8 | 18.297 | 18.126 | 17.290 | 16.773 | 16.277 | ~ | 32 | 0 |
15 | [SSA2010] 1710 | GlC | 01 34 02.4399063576 | +30 40 40.579894668 | 17.815 | 17.521 | 16.545 | 15.930 | 15.313 | ~ | 24 | 0 |
16 | [SSA2010] 1765 | GlC | 01 34 08.04 | +30 38 38.2 | 17.512 | 17.286 | 16.376 | 15.839 | 15.282 | ~ | 27 | 0 |
17 | [SSA2010] 2075 | GlC | 01 34 30.20 | +30 38 13.0 | 17.848 | 17.880 | 17.127 | 16.618 | 16.108 | ~ | 33 | 0 |
18 | [SSA2010] 2222 | GlC | 01 34 44.20 | +30 52 18.9 | 18.565 | 18.427 | 17.578 | 17.073 | 16.595 | ~ | 27 | 0 |
19 | NAME Eridanus Star Cluster | GlC | 04 24 44.5 | -21 11 13 | ~ | 178 | 1 | |||||
20 | NGC 1851 | GlC | 05 14 06.76 | -40 02 47.6 | ~ | 1430 | 0 | |||||
21 | NAME LMC | G | 05 23 34.6 | -69 45 22 | 0.4 | ~ | 17434 | 0 | ||||
22 | NGC 2204 | OpC | 06 15 31.7 | -18 40 12 | 9.35 | 8.6 | ~ | 153 | 0 | |||
23 | Cl Melotte 66 | OpC | 07 26 17.5 | -47 41 06 | 8.73 | ~ | 196 | 0 | ||||
24 | Cl Berkeley 39 | OpC | 07 46 48.5 | -04 39 54 | ~ | 190 | 1 | |||||
25 | NGC 2682 | OpC | 08 51 23.0 | +11 48 50 | ~ | 2342 | 0 | |||||
26 | C 1235-509 | GlC | 12 38 40.20 | -51 09 01.0 | ~ | 377 | 0 | |||||
27 | M 68 | GlC | 12 39 27.98 | -26 44 38.6 | 7.96 | ~ | 997 | 0 | ||||
28 | NGC 5053 | GlC | 13 16 27.09 | +17 42 00.9 | 9.96 | ~ | 620 | 0 | ||||
29 | M 3 | GlC | 13 42 11.62 | +28 22 38.2 | 6.39 | ~ | 2479 | 0 | ||||
30 | M 5 | GlC | 15 18 33.22 | +02 04 51.7 | 5.95 | ~ | 1978 | 0 | ||||
31 | M 13 | GlC | 16 41 41.634 | +36 27 40.75 | 5.8 | ~ | 2193 | 0 | ||||
32 | M 9 | GlC | 17 19 11.78 | -18 30 58.5 | 9.36 | 8.42 | ~ | 317 | 0 | |||
33 | NGC 6397 | GlC | 17 40 42.09 | -53 40 27.6 | 5.17 | ~ | 1976 | 0 | ||||
34 | NGC 6553 | GlC | 18 09 15.68 | -25 54 27.9 | 9.08 | ~ | 601 | 0 | ||||
35 | M 54 | GlC | 18 55 03.33 | -30 28 47.5 | ~ | 1069 | 0 | |||||
36 | NAME SDG | G | 18 55 19.0 | -30 32 43 | 4.5 | 3.6 | ~ | 2187 | 2 | |||
37 | NGC 6752 | GlC | 19 10 52.11 | -59 59 04.4 | ~ | 2001 | 0 | |||||
38 | Cl Arp 2 | GlC | 19 28 44.11 | -30 21 20.3 | 12.41 | ~ | 354 | 0 | ||||
39 | NGC 6819 | OpC | 19 41 18.5 | +40 11 24 | 8.21 | 7.3 | ~ | 635 | 0 | |||
40 | M 15 | GlC | 21 29 58.33 | +12 10 01.2 | ~ | 3140 | 0 | |||||
41 | M 2 | GlC | 21 33 27.02 | -00 49 23.7 | 6.25 | ~ | 1030 | 1 | ||||
42 | Cl Pal 12 | GlC | 21 46 38.84 | -21 15 09.4 | 11.89 | ~ | 516 | 0 | ||||
43 | NGC 7789 | OpC | 23 57 20.2 | +56 43 34 | 7.68 | 6.7 | ~ | 528 | 0 | |||
44 | NAME Local Group | GrG | ~ | ~ | ~ | 8391 | 0 |
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