2013ApJ...765...71C

Query : 2013ApJ...765...71C

2013ApJ...765...71C - Astrophys. J., 765, 71 (2013/March-1)

Does the Oosterhoff dichotomy exist in the Andromeda galaxy? I. The case of G11.

CONTRERAS RAMOS R., CLEMENTINI G., FEDERICI L., FIORENTINO G., CACCIARI C., CATELAN M., SMITH H.A., FUSI PECCI F., MARCONI M., PRITZL B.J. and KINEMUCHI K.

Abstract (from CDS):

We present the first evidence that Oosterhoff type II globular clusters exist in the Andromeda galaxy (M31). On the basis of time-series photometry of the moderately metal-poor ([Fe/H] ~-1.6 dex) M31 globular cluster G11, obtained with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope, we detected and derived periods for 14 RR Lyrae stars, of which five are found to lie inside the cluster tidal radius. They include three fundamental-mode (RRab) and two first-overtone (RRc) pulsators, with average periods < Pab > = 0.70 days, and < Pc > = 0.40 days, respectively. These mean periods and the position of the cluster variable stars in the period-amplitude and period-metallicity diagrams all suggest that G11 is likely to be an Oosterhoff type II globular cluster. This appears to be in agreement with the general behavior of Milky Way globular clusters with similar metallicity and horizontal branch morphology.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: M31 - globular clusters: individual: G11 - stars: distances - stars: variables: RR Lyrae - techniques: photometric

VizieR on-line data: <Available at CDS (J/ApJ/765/71): table3.dat table4.dat>

Simbad objects: 31

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Number of rows : 31
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 Bol 514 GlC 00 31 09.83 +37 54 00.0     16.28   14.68 ~ 43 0
3 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
4 Bol 293 GlC 00 36 20.8643945520 +40 53 37.135021884 17.190 17.033 16.35 15.787 15.40 ~ 58 0
5 Bol 311 GlC 00 39 33.7263390600 +40 31 14.621665512 16.338 16.209 15.362 14.803 14.39 ~ 82 0
6 Bol 12 GlC 00 40 32.4604299648 +41 21 44.200683396 15.990 15.860 15.17 14.620 14.14 ~ 81 0
7 Bol 338 GlC 00 40 58.871 +40 35 47.41 15.123 15.034 14.168 13.621 13.27 ~ 76 0
8 Bol 343 GlC 00 41 43.1127886392 +40 12 22.378121748 17.230 17.080 16.69 15.910 15.42 ~ 72 0
9 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
10 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
11 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
12 Bol 386 GlC 00 46 27.0143614272 +42 01 52.743069552 16.554 16.355 15.541 14.997 14.435 ~ 93 0
13 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
14 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
15 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
16 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 467 0
17 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
18 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
19 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
20 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
21 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
22 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
23 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
24 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 348 0
25 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
26 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
27 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
28 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
29 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
30 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
31 NAME Local Group GrG ~ ~           ~ 9325 0

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