2009ApJ...699L.125M

Query : 2009ApJ...699L.125M

2009ApJ...699L.125M - Astrophys. J., 699, L125-L129 (2009/July-2)

The Leo IV dwarf spheroidal galaxy: color-magnitude diagram and pulsating stars.

MORETTI M.I., DALL'ORA M., RIPEPI V., CLEMENTINI G., DI FABRIZIO L., SMITH H.A., DE LEE N., KUEHN C., CATELAN M., MARCONI M., MUSELLA I., BEERS T.C. and KINEMUCHI K.

Abstract (from CDS):

We present the first V, B - V color-magnitude diagram of the Leo IV dwarf spheroidal galaxy, a faint Milky Way satellite recently discovered by the Sloan Digital Sky Survey. We have obtained B, V time-series photometry reaching about half a magnitude below the Leo IV turnoff, which we detect at V = 24.7 mag, and have performed the first study of the variable star population. We have identified three RR Lyrae stars (all fundamental-mode pulsators, RRab) and one SX Phoenicis variable in the galaxy. In the period-amplitude diagram the Leo IV RR Lyrae stars are located close to the loci of Oosterhoff type I systems and the evolved fundamental-mode RR Lyrae stars in the Galactic globular cluster M3. However, their mean pulsation period, = 0.655 days, would suggest an Oosterhoff type II classification for this galaxy. The RR Lyrae stars trace very well the galaxy's horizontal branch, setting its average magnitude at RR> = 21.48±0.03 mag (standard deviation of the mean). This leads to a distance modulus of µ0= 20.94±0.07 mag, corresponding to a distance of 154±5 kpc, by adopting for the Leo IV dSph a reddening E(B - V) = 0.04±0.01 mag and a metallicity of [Fe/H] = -2.31±0.10.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: individual: Leo IV - stars: distances - stars: variables: other - techniques: photometric

Nomenclature: Table 1: [MDR2009] VN (Nos V1-V4).

Simbad objects: 35

goto Full paper

goto View the references in ADS

Number of rows : 35
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 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME Sculptor S G 01 00 22 -33 41.8           ~ 3 0
3 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
4 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
5 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
6 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 203 1
7 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
8 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
9 SA 101- reg 09 57 28.2 -00 19 39           ~ 74 0
10 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
11 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
12 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
13 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
14 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
15 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
16 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
17 [MDR2009] V4 Pu* 11 32 45.40 -00 31 44.4   23.34 22.96     ~ 1 0
18 [MDR2009] V2 RR* 11 32 55.82 -00 33 29.8   21.86 21.46     ~ 6 0
19 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
20 [MDR2009] V1 RR* 11 32 59.19936 -00 34 04.1448   21.82 21.47     ~ 3 0
21 [MDR2009] V3 RR* 11 33 36.60 -00 38 43.3   21.81 21.52     ~ 4 0
22 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
23 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
24 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
25 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
26 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 115 1
27 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
28 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
29 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
30 SA 107- reg 15 39.2 -00 20           ~ 91 0
31 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 594 3
32 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
33 SA 110- reg 18 45 +00.6           ~ 100 0
34 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
35 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

To bookmark this query, right click on this link: simbad:objects in 2009ApJ...699L.125M and select 'bookmark this link' or equivalent in the popup menu