2018MNRAS.479.4279M

Query : 2018MNRAS.479.4279M

2018MNRAS.479.4279M - Mon. Not. R. Astron. Soc., 479, 4279-4291 (2018/October-0)

Variable stars in local group galaxies - IV. RR Lyrae stars in the central regions of the low-density galaxy Crater II.

MONELLI M., WALKER A.R., MARTINEZ-VAZQUEZ C.E., STETSON P.B., GALLART C., BERNARD E.J., BONO G., VIVAS A.K., ANDREUZZI G., DALL'ORA M., FIORENTINO G. and DORTA A.

Abstract (from CDS):

We present a search and analysis of variable stars in the recently discovered Crater II dwarf galaxy. Based on B, V, I data collected with the Isaac Newton Telescope (FoV∼0.44 deg2), we detected 37 variable stars, of which 34 are bone-fide RR Lyrae stars of Crater II (28 RRab, 4 RRc, 2 RRd). We applied the metal-independent (V, B - V) Period-Wesenheit relation and derived a true distance modulus (µ = 20.30 ± 0.08 mag (σ = 0.16 mag). Individual metallicities for RR Lyrae stars were derived by inversion of the predicted I-band Period-Luminosity relation. We find a mean metallicity of [Fe/H] = -1.64 and a standard deviation of σ_[ Fe/H]_=0.21 dex, compatible with either negligible or vanishing intrinsic metallicity dispersion. The analysis of the colour-magnitude diagram reveals a stark paucity of blue horizontal branch stars, at odds with other Galactic dwarfs, and globular clusters with similar metal abundances.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: general - stars: horizontal branch - stars: variables: RR Lyrae - galaxies: evolution - Local Group

Nomenclature: Table 2: [MWM2018] V098 N=1.

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 66

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Number of rows : 66
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 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 152 0
2 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 234 0
3 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 295 0
4 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 122 0
5 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 122 0
6 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1359 4
7 NAME Andromeda XXIV G 01 18 30.0 +46 21 58     16.3     ~ 62 0
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7066 0
9 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 174 0
10 NAME E 1 GlC 03 55 02.5 -49 36 52           ~ 208 0
11 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 163 1
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
13 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1125 0
14 NAME PYX GLOBULAR CL GlC 09 07 57.80 -37 13 17.0           ~ 107 0
15 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 391 0
16 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1208 1
17 [JKY2018] V65 RR* 11 47 45.0472346880 -18 23 27.158920728           ~ 3 0
18 [JKY2018] V10 RR* 11 47 51.7137052944 -18 11 12.248356704           ~ 3 0
19 [JKY2018] V15 RR* 11 47 57.0261763488 -18 08 39.726466404           ~ 3 0
20 [JKY2018] V23 RR* 11 48 10.6265707416 -18 17 42.884100024           ~ 3 0
21 [JKY2018] V22 RR* 11 48 14.9076335784 -18 15 09.199895796           ~ 3 0
22 [JKY2018] V20 RR* 11 48 35.3948740467 -18 30 54.808100427           ~ 3 0
23 [MWM2018] V098 V* 11 48 38.19 -18 35 39.7           ~ 2 0
24 [JKY2018] V3 RR* 11 48 38.7608269512 -18 31 40.348916616           ~ 3 0
25 [JKY2018] V14 RR* 11 48 39.6294408384 -18 09 24.300345852           ~ 3 0
26 [JKY2018] V12 RR* 11 48 41.0081360784 -18 31 45.574964472           ~ 3 0
27 [JKY2018] V83 RR* 11 48 45.4591100160 -18 09 58.801436280           ~ 3 0
28 [JKY2018] V1 RR* 11 48 46.9464312456 -18 37 28.967942892           ~ 4 0
29 [JKY2018] V8 RR* 11 48 46.9976165976 -18 31 30.708475104           ~ 3 0
30 [JKY2018] V72 RR* 11 48 49.9872504000 -18 28 27.702965100           ~ 3 0
31 [JKY2018] V4 RR* 11 48 51.1663077672 -18 16 34.368081492           ~ 3 0
32 [JKY2018] V13 RR* 11 48 51.5972988792 -18 41 34.172131020           ~ 3 0
33 [JKY2018] V5 RR* 11 48 51.8662807378 -18 31 57.047768756           ~ 3 0
34 [JKY2018] V92 RR* 11 48 58.0367035656 -18 22 07.965328692           ~ 3 0
35 [JKY2018] V2 RR* 11 48 59.4881912400 -18 10 10.025161392           ~ 3 0
36 [JKY2018] V76 RR* 11 49 04.0819826352 -18 09 07.809370272           ~ 3 0
37 [JKY2018] V21 RR* 11 49 05.7603990768 -18 32 03.120281196           ~ 3 0
38 [JKY2018] V25 RR* 11 49 05.8362411024 -18 40 47.027176644           ~ 3 0
39 [JKY2018] V70 RR* 11 49 12.0331506000 -18 15 50.570138124           ~ 3 0
40 [JKY2018] V68 RR* 11 49 12.5115258216 -18 19 36.750315432           ~ 3 0
41 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 137 0
42 [JKY2018] V97 SX* 11 49 16.150 -18 18 35.54           ~ 4 0
43 [JKY2018] V78 RR* 11 49 16.9003800600 -18 33 54.467400024           ~ 3 0
44 [JKY2018] V77 RR* 11 49 17.3732574048 -18 38 55.939375932           ~ 3 0
45 [JKY2018] V29 RR* 11 49 23.4901215096 -18 20 08.753155800           ~ 3 0
46 [JKY2018] V73 RR* 11 49 30.2152651056 -18 41 32.434759572           ~ 3 0
47 [JKY2018] V46 RR* 11 49 36.8129708616 -18 35 26.800063044           ~ 3 0
48 [JKY2018] V52 RR* 11 49 40.5797471016 -18 19 04.764425016           ~ 3 0
49 [JKY2018] V56 RR* 11 49 44.8502338560 -18 35 02.580507888           ~ 3 0
50 [JKY2018] V33 RR* 11 49 45.6454717560 -18 32 56.406588972           ~ 3 0
51 [JKY2018] V50 RR* 11 49 46.7219041080 -18 32 13.095512988           ~ 3 0
52 [JKY2018] V66 RR* 11 49 46.9903218720 -18 27 21.057621984           ~ 3 0
53 [JKY2018] V57 RR* 11 49 53.6778965712 -18 16 39.622100412           ~ 3 0
54 [JKY2018] V35 RR* 11 49 56.2964217192 -18 37 43.195707336           ~ 3 0
55 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 377 0
56 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2478 0
57 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 437 0
58 NAME UMi Galaxy G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1359 0
59 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 368 0
60 NGC 6144 GlC 16 27 13.86 -26 01 24.6           ~ 243 0
61 NGC 6535 GlC 18 03 50.51 -00 17 51.5     9.85     ~ 294 0
62 NGC 6541 GlC 18 08 02.36 -43 42 53.6           ~ 377 0
63 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2187 2
64 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 532 0
65 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 300 0
66 NAME Local Group GrG ~ ~           ~ 8390 0

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