2016ApJ...828...15H

Query : 2016ApJ...828...15H

2016ApJ...828...15H - Astrophys. J., 828, 15-15 (2016/September-1)

Carbon stars in the satellites and halo of M31.

HAMREN K., BEATON R.L., GUHATHAKURTA P., GILBERT K.M., TOLLERUD E.J., BOYER M.L., ROCKOSI C.M., SMITH G.H., MAJEWSKI S.R. and HOWLEY K.

Abstract (from CDS):

We spectroscopically identify a sample of carbon stars in the satellites and halo of M31 using moderate-resolution optical spectroscopy from the Spectroscopic and Photometric Landscape of Andromeda's Stellar Halo survey. We present the photometric properties of our sample of 41 stars, including their brightness with respect to the tip of the red giant branch (TRGB) and their distributions in various color-color spaces. This analysis reveals a bluer population of carbon stars fainter than the TRGB and a redder population of carbon stars brighter than the TRGB. We then apply principal component analysis to determine the sample's eigenspectra and eigencoefficients. Correlating the eigencoefficients with various observable properties reveals the spectral features that trace effective temperature and metallicity. Putting the spectroscopic and photometric information together, we find the carbon stars in the satellites and halo of M31 to be minimally impacted by dust and internal dynamics. We also find that while there is evidence to suggest that the sub-TRGB stars are extrinsic in origin, it is also possible that they are are particularly faint members of the asymptotic giant branch.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: individual: M31 - stars: AGB and post-AGB - stars: carbon - stars: carbon

Nomenclature: Table 2: [HBG2016] NNNNNNNN N=40 (Nos 131-60001744), Table 2: [HBG2016] osN N=1 (No os2).

Simbad objects: 74

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Number of rows : 74
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 NAME Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
3 [BD2004c] 13 C* 00 32 23.20 +48 18 46.5     22.26 21.243 20.029 C 2 0
4 [BD2004c] 25 C* 00 32 33.40 +48 20 36.7     22.84 21.826 20.606 C 2 0
5 [BD2004c] 41 C* 00 32 45.10 +48 22 44.4     23.65 22.424 20.904 C 2 0
6 [HBG2016] 7187 C* 00 32 46.10 +48 23 04.6     22.40 21.49 20.51 C 1 0
7 [GVG2010] NGC 147 223 C* 00 32 55.30 +48 25 59.5     22.82 22.03 21.3 C 2 0
8 [BD2004c] 114 C* 00 33 06.60 +48 23 43.7     22.66 21.688 20.553 C 2 0
9 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
10 [HBG2016] 16315 C* 00 33 16.80 +48 35 57.9     22.57 21.66 20.65 C 1 0
11 [HBG2016] os2 C* 00 33 28.60 +48 32 19.8     21.86 21.26 20.68 C 2 0
12 [BD2004c] 222 C* 00 33 30.20 +48 35 15.5     22.31 21.312 20.129 C 2 0
13 [GVG2010] NGC 147 377 C* 00 33 53.40 +48 37 41.7     23.05 22.26 21.5 C 2 0
14 [BD2004c] 274 C* 00 33 54.10 +48 38 57.9     22.56 21.456 20.104 C 2 0
15 [BD2004c] 275 C* 00 33 59.00 +48 40 43.7     24.09 22.714 21.038 C 2 0
16 NAME [HBG2016] 17901 C* 00 34 42.85 +42 25 21.3     22.35 21.56 20.81 C 1 0
17 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
18 [HGT2015] NGC185 144 C* 00 38 32.78 +48 13 28.4     22.12 21.92 21.2 C 3 0
19 [HGT2015] NGC185 174 C* 00 38 47.89 +48 15 25.7     21.12 20.89 20 C 3 0
20 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
21 [HBG2016] 2186 C* 00 39 15.05 +41 53 19.8     22.62 21.69 20.66 C 1 0
22 NAME [HBG2016] 17901 C* 00 39 15.88 +48 20 08.2     21.86 20.94 20 C 3 0
23 [HGT2015] NGC185 55 C* 00 39 39.26 +48 28 55.2     22.44 22.29 21.5 C 3 0
24 PSO J009.9927+41.8092 C* 00 39 58.26367200 +41 48 33.2097120     22.99 21.89 20.55 C 2 0
25 PSO J010.0444+41.7568 C* 00 40 10.66596960 +41 45 24.6800160     22.91 21.86 20.59 C 2 0
26 [HBG2016] 26251 C* 00 40 13.88 +41 44 21.4     22.72 21.82 20.86 C 1 0
27 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
28 [HGT2015] NGC205 127 C* 00 40 23.04 +41 39 12.8     21.74 21.19 19.94 C 2 0
29 [DBL2003] 288 C* 00 40 32.10 +41 45 29.4     22.25 21.69 20.45 C 3 0
30 PSO J010.1695+41.6215 C* 00 40 40.69820640 +41 37 17.6043720     22.05 21.53 20.45 C 3 0
31 [HBG2016] 233791 C* 00 41 53.86 +40 52 42.7         20.55 C 1 0
32 [HBG2016] 263107 C* 00 42 12.49 +40 54 23.2         20.48 C 1 0
33 PSO J010.6434+40.8845 C* 00 42 34.43621280 +40 53 04.3078920     21.19   19.49 C 3 0
34 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
35 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
36 PSO J010.7035+40.8291 C* 00 42 48.85638000 +40 49 44.8549680         20.02 C 2 0
37 [HBG2016] 160934 C* 00 42 53.46 +40 48 20.2         20.46 C 1 0
38 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
39 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
40 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
41 [EGF2022] 507513 C* 00 50 15.66 +41 42 07.7     22.89   21.34 C 2 0
42 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
43 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
44 [EGF2022] 137459 C* 00 52 14.21 +42 08 55.5     22.85   21.18 C 2 0
45 [EGF2022] 170544 C* 00 52 45.74 +42 15 24.8     22.70   20.89 C 2 0
46 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
47 [HBG2016] 60001744 C* 00 53 00.95 +43 12 00.1     22.75 22.11 21.49 C 1 0
48 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
49 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
50 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
51 [HBG2016] 1000009 C* 01 06 33.77 +44 48 43.8     21.90 21.22 20.41 C 2 0
52 [KZG2009] J010635.21+444806.3 C* 01 06 35.21 +44 48 06.3     22.31 22.07 21.84 C 2 0
53 [HBG2016] 3005915 C* 01 10 16.79 +47 36 56.5     21.91 21.20 20.52 C 2 0
54 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
55 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
56 [HBG2016] 6004761 C* 01 15 50.50 +33 29 37.9     22.49 21.83 21.19 C 2 0
57 [KNO2004] A1215 C* 01 16 28.58 +33 27 28.6     22.13     C 2 0
58 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
59 [KNO2004] A2029 C* 01 16 39.27 +33 27 22.8     21.97 21.39 20.84 C 2 0
60 [HGT2015] AndII 1 C* 01 17 13.1315746344 +33 30 04.405579488     21.52 20.63 19.72 C 2 0
61 NAME Andromeda XXII G 01 27 40.0 +28 05 25     18.0     ~ 95 0
62 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
63 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
64 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
65 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
66 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
67 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
68 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
69 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
70 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
71 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
72 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
73 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
74 NAME Local Group GrG ~ ~           ~ 9325 0

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