2007ApJ...662..272V

Query : 2007ApJ...662..272V

2007ApJ...662..272V - Astrophys. J., 662, 272-283 (2007/June-2)

Imaging of the stellar population of IC 10 with laser guide star adaptive optics and the Hubble Space Telescope.

VACCA W.D., SHEEHY C.D. and GRAHAM J.R.

Abstract (from CDS):

We present adaptive optics (AO) images of the central starburst region of the dwarf irregular galaxy IC 10. The Keck II telescope laser guide star was used to achieve near diffraction-limited performance at H and K' (Strehl ratios of 18% and 32%, respectively). The images are centered on the putative Wolf-Rayet (W-R) object [MAC92]24. We combine our AO images with F814W data from HST. By comparing the K' versus [F814W]-K' color-magnitude diagram (CMD) with theoretical isochrones, we find that the stellar population is best represented by at least two bursts of star formation, one ∼10 Myr ago and one much older (150-500 Myr). Young, blue stars are concentrated in the vicinity of [MAC92]24. This population represents an OB association with a half-light radius of about 3 pc. We resolve the W-R object [MAC92] 24 into at least six blue stars. Four of these components have near-IR colors and luminosities that make them robust WN star candidates. By matching the location of C stars in the CMD with those in the SMC we derive a distance modulus for IC 10 of about 24.5 mag and a foreground reddening of E(B-V)=0.95 mag. We find a more precise distance by locating the tip of the giant branch in the F814W, H, and K' luminosity functions. We find a weighted mean distance modulus of 24.48±0.08. The systematic error in this measurement, due to a possible difference in the properties of the RGB populations in IC 10 and the SMC, is ±0.16 mag.

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Journal keyword(s): Galaxies: Individual: Alphanumeric: IC 10 - Galaxies: Starburst - Galaxies: Star Clusters

Nomenclature: Table 1: [VSG2007] NN (Nos 1-23).

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 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
2 [HL90] 111c HII 00 20 26.3 +59 17 57           ~ 16 0
3 [VSG2007] 23 * 00 20 26.828 +59 17 38.06         24.27 ~ 1 0
4 [VSG2007] 21 * 00 20 27.079 +59 17 39.30         24.54 ~ 1 0
5 [VSG2007] 13 * 00 20 27.098 +59 17 35.08         21.32 ~ 1 0
6 [VSG2007] 12 * 00 20 27.127 +59 17 44.59         20.91 ~ 1 0
7 [VSG2007] 10 * 00 20 27.142 +59 17 41.02         18.35 ~ 1 0
8 [VSG2007] 16 * 00 20 27.202 +59 17 42.33         21.1 ~ 1 0
9 [VSG2007] 18 * 00 20 27.219 +59 17 37.57         21.17 ~ 1 0
10 [VSG2007] 6 * 00 20 27.321 +59 17 37.26         20.92 ~ 1 0
11 [VSG2007] 4 * 00 20 27.360 +59 17 37.33         18.26 ~ 1 0
12 [VSG2007] 3 * 00 20 27.365 +59 17 37.14         17.85 ~ 1 0
13 [VSG2007] 9 * 00 20 27.384 +59 17 37.95         17.7 ~ 1 0
14 [VSG2007] 17 * 00 20 27.413 +59 17 36.82         21.88 ~ 1 0
15 [VSG2007] 1 * 00 20 27.440 +59 17 38.92         21.76 ~ 1 0
16 [VSG2007] 8 * 00 20 27.447 +59 17 35.84     22.0   21.14 OV 4 0
17 [VSG2007] 2 * 00 20 27.506 +59 17 36.99         20.33 ~ 1 0
18 [VSG2007] 5 * 00 20 27.517 +59 17 37.00         20.33 ~ 1 0
19 [VSG2007] 19 * 00 20 27.532 +59 17 37.23         21.81 ~ 1 0
20 [VSG2007] 7 * 00 20 27.560 +59 17 38.86         19.02 ~ 1 0
21 [MAC92] 24-A mul 00 20 27.67 +59 17 37.7     18.8     WN+OB 4 0
22 [MAC92] 24 mul 00 20 27.73 +59 17 37.2           WN 12 0
23 [VSG2007] 22 * 00 20 27.770 +59 17 38.16         24.79 ~ 1 0
24 [H2001] 4-1 Cl* 00 20 27.77 +59 17 38.6           ~ 5 0
25 [MAC92] 24-B mul 00 20 27.82 +59 17 37.5     21.3     ~ 4 0
26 [VSG2007] 15 * 00 20 28.029 +59 17 39.61         21.39 ~ 1 0
27 [VSG2007] 20 * 00 20 28.031 +59 17 37.97         21.77 ~ 1 0
28 [VSG2007] 14 * 00 20 28.035 +59 17 38.60         21.77 ~ 1 0
29 [VSG2007] 11 * 00 20 28.155 +59 17 42.04         20.67 ~ 1 0
30 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
31 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 547 0
32 NAME Local Group GrG ~ ~           ~ 9325 0

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