2008ApJ...674L..81K

Query : 2008ApJ...674L..81K

2008ApJ...674L..81K - Astrophys. J., 674, L81-L84 (2008/February-3)

Variable stars in the newly discovered Milky Way dwarf spheroidal satellite Canes Venatici I.

KUEHN C., KINEMUCHI K., RIPEPI V., CLEMENTINI G., DALL'ORA M., DI FABRIZIO L., RODGERS C.T., GRECO C., MARCONI M., MUSELLA I., SMITH H.A., CATELAN M., BEERS T.C. and PRITZL B.J.

Abstract (from CDS):

We have identified 23 RR Lyrae stars and three possible anomalous Cepheids (ACs) among 84 candidate variables in the recently discovered Canes Venatici I (CVn I) dwarf spheroidal galaxy. The mean period of 18 RRab type stars, <Pab≥0.60±0.01 days, and the location of these stars in the period-amplitude diagram suggest that CVn I is likely an Oosterhoff-intermediate system. The average apparent magnitude of the RR Lyrae stars, <V≥22.17±0.02 mag, gives a distance of 210+7–5kpc, for an adopted reddening E(B-V)=0.03 mag. We present a B, V color-magnitude diagram (CMD) of CVn I that reaches V∼25 mag, and shows that the galaxy has a mainly old stellar population with a metal abundance near [Fe/H] = -2.0 dex. The width of the red giant branch and the location of the candidate ACs on the CMD may indicate that the galaxy hosts a complex stellar population with stars from ∼13 Gyr to as young as ∼0.6 Gyr.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Distances and Redshifts - Galaxies: Dwarf - galaxies: individual (Canes Venatici I) - Stars: Horizontal-Branch - Stars: Variables: Other - Techniques: Photometric

VizieR on-line data: <Available at CDS (J/ApJ/674/L81): table1.dat>

Nomenclature: Table 1, col(1): [KKR2008] VNN (Nos V1-V26) = Table 1, col(2): [KKR2008] NNNN N=26 among (Nos 1054-2293).

Simbad objects: 32

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Number of rows : 32
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 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
2 SA 104- reg 12 42 21.0 -00 32 29           ~ 58 0
3 [KKR2008] 1054 RR* 13 27 29.1 +33 38 03   22.53 22.12     ~ 1 0
4 [KKR2008] 1854 V* 13 27 30.82 +33 33 47.8   22.46 22.10     ~ 1 0
5 [KKR2008] 2500 RR* 13 27 35.53 +33 30 27.3   22.64 22.26     ~ 1 0
6 [MIC2007] J132737.37+333555.6 RR* 13 27 37.37 +33 35 55.6   22.63 22.23     ~ 2 0
7 [KKR2008] 2341 RR* 13 27 45.48 +33 31 25.7   22.61 22.24     ~ 1 0
8 [KKR2008] 1979 RR* 13 27 45.86 +33 33 09.7   22.63 22.22     ~ 1 0
9 [KKR2008] 1067 RR* 13 27 50.3 +33 38 02   22.57 22.18     ~ 1 0
10 [KKR2008] 1988 RR* 13 27 52.11 +33 33 08.9   22.62 22.23     ~ 1 0
11 [KKR2008] 2510 RR* 13 27 54.33 +33 30 25.9   22.55 22.20     ~ 1 0
12 [KKR2008] 2700 RR* 13 27 55.97 +33 28 59.9   22.48 22.07     ~ 1 0
13 [KKR2008] V8 RR* 13 27 57.68 +33 33 43.3   22.67 22.24     ~ 2 0
14 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
15 [KKR2008] 2842 RR* 13 28 06.32 +33 27 51.0   22.44 22.13     ~ 1 0
16 [KKR2008] 1619 RR* 13 28 09.21 +33 35 08.7   22.34 21.90     ~ 1 0
17 [KKR2008] 2477 RR* 13 28 12.70 +33 30 40.0   22.45 22.16     ~ 1 0
18 [KKR2008] 2199 V* 13 28 13.94 +33 32 13.6   22.45 22.19     ~ 1 0
19 [KKR2008] 1350 RR* 13 28 14.23 +33 36 29.0   22.74 22.30     ~ 1 0
20 [KKR2008] 1057 V* 13 28 21.83 +33 38 08.8   20.53 20.032     ~ 1 0
21 [KKR2008] 1430 RR* 13 28 28.74 +33 36 05.4   22.50 22.16     ~ 1 0
22 [KKR2008] 2837 RR* 13 28 29.99 +33 27 55.8   22.78 22.20     ~ 1 0
23 [KKR2008] 2131 RR* 13 28 33.65 +33 32 38.0   22.40 22.08     ~ 1 0
24 [MIC2007] J132834.77+333507.1 * 13 28 34.77 +33 35 07.1   22.56 22.21     ~ 2 0
25 [KKR2008] 1898 V* 13 28 37.65 +33 33 44.8   22.54 22.09     ~ 1 0
26 [KKR2008] 1278 V* 13 28 38.45 +33 36 55.3   21.00 20.62     ~ 1 0
27 [KKR2008] 1179 RR* 13 28 38.7 +33 37 29   22.61 22.21     ~ 1 0
28 [KKR2008] 1928 V* 13 28 39.57 +33 33 33.7   22.47 22.12     ~ 1 0
29 [KKR2008] 2293 V* 13 28 46.19 +33 31 46.5   21.08 20.54     ~ 1 0
30 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
31 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
32 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1

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