2004A&A...421..937G


Query : 2004A&A...421..937G

2004A&A...421..937G - Astronomy and Astrophysics, volume 421, 937-952 (2004/7-3)

Metal abundances of RR Lyrae stars in the bar of the Large Magellanic Cloud.

GRATTON R.G., BRAGAGLIA A., CLEMENTINI G., CARRETTA E., DI FABRIZIO L., MAIO M. and TARIBELLO E.

Abstract (from CDS):

Metallicities ([Fe/H]) from low resolution spectroscopy obtained with the Very Large Telescope (VLT) are presented for 98 RR Lyrae and 3 short period Cepheids in the bar of the Large Magellanic Cloud. Our metal abundances have typical errors of ±0.17dex. The average metallicity of the RR Lyrae stars is [Fe/H]=-1.48±0.03±0.06 on the scale of Harris (1996AJ....112.1487H). The star-to-star scatter (0.29dex) is larger than the observational errors, indicating a real spread in metal abundances. The derived metallicities cover the range -2.12<[Fe/H]←0.27, but there are only a few stars having [Fe/H]>-1. For the ab-type variables we compared our spectroscopic abundances with those obtained from the Fourier decomposition of the light curves. We find good agreement between the two techniques, once the systematic offset of 0.2dex between the metallicity scales used in the two methods is taken into account. The spectroscopic metallicities were combined with the dereddened apparent magnitudes of the variables to derive the slope of the luminosity-metallicity relation for the LMC RR Lyrae stars: the resulting value is 0.214±0.047mag/dex. Finally, the 3 short period Cepheids have [Fe/H] values in the range -2.0<[Fe/H]←1.5. They are more metal-poor than typical LMC RR Lyrae stars, thus they are more likely to be Anomalous Cepheids rather than the short period Classical Cepheids that are often found in a number of dwarf Irregular galaxies.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: evolution - stars: Population II - galaxies: magellanic clouds

VizieR on-line data: <Available at CDS (J/A+A/421/937): table7.dat>

Nomenclature: Table 7: [DCM2005] A-NNNNN N=101.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

CDS comments: Table 3: star 99999 not identified. Table 7: Authors say 'variables identified acording to Di Fabrizio+', ref. 2005A&A...430..603D ([DCM2005]), so the format is 'A-NNNNN' (for fields A and B), sub-fields 'AN' are not used.

Simbad objects: 64

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Number of rows : 64
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6285 1
2 Cl* NGC 1851 W 702 RR* 05 14 09.9008095104 -40 02 12.063430752   16.404 16.039     ~ 8 0
3 NAME LMC Bar ? 05 22 08 -69 23.5           ~ 281 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16002 1
5 NGC 3201 2413 RR* 10 17 28.0058525448 -46 23 35.850562512   15.23 14.84     ~ 11 0
6 NGC 3201 2419 RR* 10 17 29.0341912488 -46 22 55.812955476   14.98 14.71     ~ 10 0
7 NGC 3201 2322 RR* 10 17 33.6305683944 -46 22 13.391817240   15.57 14.78     ~ 9 0
8 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 797 0
9 NGC 3201 3103 RR* 10 17 39.4678270776 -46 19 30.825680952   15.37 14.85     kA4hF1.5 9 0
10 NGC 3201 3608 RR* 10 17 41.2334754816 -46 23 49.639300476   15.33 14.89     ~ 5 0
11 SV* HV 10346 RR* 10 17 43.0669290820 -46 24 16.774538499   15.42 14.70     ~ 6 0
12 NGC 3201 3307 RR* 10 17 46.2272469360 -46 22 29.353780956   15.26 14.98     ~ 8 0
13 Cl* NGC 4590 ALC 72 RR* 12 39 15.3006491448 -26 45 24.497317116   16.194 15.62     ~ 15 0
14 Cl* NGC 4590 WALK 86 HB* 12 39 20.2709949048 -26 45 10.804552956   15.892 15.830     ~ 2 0
15 Cl* NGC 4590 WALK 112 HB* 12 39 22.04 -26 45 36.1   15.867 15.726     ~ 2 0
16 Cl* NGC 4590 WALK 170 HB* 12 39 24.8788443600 -26 43 40.058728608   15.907 15.714     ~ 3 0
17 Cl* NGC 4590 ALC 58 RR* 12 39 25.1924133288 -26 46 52.716976212   15.88 15.46     ~ 12 0
18 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 936 0
19 Cl* NGC 4590 WALK 340 HB* 12 39 29.2839481560 -26 42 53.807691456   15.925 15.748     ~ 4 0
20 Cl* NGC 4590 ALC 121 RR* 12 39 30.2709536880 -26 46 32.986292160   15.62 15.28     ~ 14 0
21 Cl* NGC 4590 WALK 397 HB* 12 39 30.60 -26 44 59.2   15.922 15.807     ~ 2 0
22 Cl* NGC 4590 WALK 457 HB* 12 39 32.5887346032 -26 44 23.504511948   16.092 15.605     ~ 2 0
23 Cl* NGC 4590 WALK 464 HB* 12 39 32.8474212744 -26 45 52.379146692   15.696 15.491     ~ 4 0
24 Cl* NGC 4590 VO V25 RR* 12 39 38.1586521696 -26 42 36.962326620   16.13 15.33     ~ 13 0
25 Cl* NGC 4590 WALK 535 HB* 12 39 39.4884464952 -26 43 57.193059468   15.899 15.726     ~ 2 0
26 Cl* NGC 5139 B V95 RR* 13 25 24.91 -47 28 53.0 15.051 15.114 14.588 14.329 13.969 ~ 26 0
27 Cl* NGC 5139 B V45 RR* 13 25 30.8519640216 -47 27 20.883249072 15.323 15.376 14.669 14.468 14.067 hF5.5 29 0
28 Cl* NGC 5139 B V33 RR* 13 25 51.5641162584 -47 29 06.100757484 14.752 15.159 14.639 14.693 13.893 hF2.5 27 0
29 Cl* NGC 5139 B V50 RR* 13 25 53.9151661104 -47 27 36.147349872 15.225 14.795 14.759 14.209 14.094 ~ 24 0
30 Cl* NGC 5139 SAW V3 RR* 13 25 56.1361355808 -47 25 54.172434324 15.070 15.171 14.383 14.075 13.659 hF5 30 0
31 Cl* NGC 5139 B V94 RR* 13 25 57.0723723936 -47 22 46.388935020 15.235 14.822 14.819 14.591 14.346 ~ 19 0
32 Cl* NGC 5139 B V9 RR* 13 25 59.5677228192 -47 26 24.392966244 15.702 15.041 14.906 14.518 14.184 hF6.5 23 0
33 NGC 5139 5781 RR* 13 26 04.0638486288 -47 21 46.859446188   14.824 14.499 14.353 14.024 ~ 16 0
34 Cl* NGC 5139 B V10 RR* 13 26 06.9861891240 -47 24 36.975164544 15.058 15.054 14.471 14.379 13.947 hF4.5 28 0
35 Cl* NGC 5139 B V68 RR? 13 26 12.7913990280 -47 19 36.069235140 14.796 14.444 14.173 13.991 13.603 ~ 26 0
36 Cl* NGC 5139 B V4 RR* 13 26 12.9160984656 -47 24 19.215721188 15.094 14.932 14.401 14.298 13.838 hF5 30 0
37 Cl* NGC 5139 B V58 RR* 13 26 13.0335144720 -47 24 03.437361000 15.088 14.841 14.444 14.331 13.961 ~ 23 0
38 Cl* NGC 5139 B V92 Ce* 13 26 14.8224713424 -47 21 14.771155392 14.586 14.610 14.026 13.707 13.200 ~ 25 0
39 Cl* NGC 5139 B V54 RR* 13 26 23.4999960336 -47 18 48.094551756 14.918 15.228 14.42   13.748 ~ 32 0
40 Cl* NGC 5139 B V15 RR* 13 26 27.0765625992 -47 24 38.390605272 15.199 14.512 14.430 14.141 13.680 ~ 27 0
41 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3231 0
42 Cl* NGC 5139 B V125 RR* 13 26 48.9756813816 -47 41 03.660631656   15.359 14.850 14.302 14.062 hF5 30 0
43 Cl* NGC 5139 B V123 RR* 13 26 51.0769062408 -47 37 13.324520712   14.998 14.482 14.104 13.853 ~ 23 0
44 Cl* NGC 5139 B V124 RR* 13 26 54.3859203984 -47 39 07.631169228   14.931 14.562 14.379 14.117 hF3.5 22 0
45 Cl* NGC 5139 B V38 RR* 13 27 03.2376906168 -47 36 30.492685944 15.039 14.765 14.567 14.150 13.791 hF6 30 0
46 Cl* NGC 1851 WALK 129 HB* ~ ~     16.152     ~ 2 0
47 Cl* NGC 1851 W 647 * ~ ~   16.328 16.111     ~ 5 0
48 Cl* NGC 4590 VO V22 RR* ~ ~           ~ 6 0
49 Cl* NGC 4590 SAW V17 RR* ~ ~           ~ 2 0
50 Cl* NGC 4590 SAW V12 RR* ~ ~           ~ 2 0
51 Cl* NGC 4590 ALC 99 RR* ~ ~   15.78 15.44     ~ 9 0
52 Cl* NGC 4590 VO V30 RR* ~ ~   16.10 15.46     ~ 6 0
53 Cl* NGC 4590 ALC 104 RR* ~ ~   15.87 15.06     ~ 7 0
54 Cl* NGC 4590 ALC 120 RR* ~ ~   15.78 15.81     ~ 6 0
55 Cl* NGC 4590 SAW V13 RR* ~ ~           ~ 6 0
56 Cl* NGC 4590 SAW V9 RR* ~ ~           ~ 3 0
57 Cl* NGC 1851 W 688 * ~ ~   16.28 16.03     ~ 6 0
58 Cl* NGC 3201 RAS 2729 * ~ ~           ~ 1 0
59 Cl* NGC 3201 RAS 498 * ~ ~           ~ 1 0
60 Cl* NGC 3201 RAS 263 * ~ ~           ~ 1 0
61 Cl* NGC 3201 RAS 10 * ~ ~           ~ 1 0
62 Cl* NGC 1851 WALK 1278 HB* ~ ~     16.210     ~ 2 0
63 Cl* NGC 1851 WALK 1247 HB* ~ ~     16.167     ~ 2 0
64 Cl* NGC 1851 WALK 1031 HB* ~ ~     16.139     ~ 2 0

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2022.05.28-09:42:53

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