2012A&A...544A..10B


Query : 2012A&A...544A..10B

2012A&A...544A..10B - Astronomy and Astrophysics, volume 544A, 10-10 (2012/8-1)

Variability of halo carbon stars.

BATTINELLI P. and DEMERS S.

Abstract (from CDS):

Carbon stars are among the brightest intermediate-age stars. Over one hundred have been identified in the Galactic halo. Since the halo consists essentially in an old stellar population, we believe that these C stars are trespassers and belong to streams left over by disrupted dwarf spheroidal galaxies. By performing photometric monitoring we intend to detect long-period variables among halo carbon stars. We should be in position to identify Mira, semi-regular, and irregular variables and determine their period and age group. We obtained, over several semesters, K, J, and I images centered on the C stars in order to determine their variation and periodicity. We establish the period of 14 program stars and discover 13 Miras among them. Most of them belong to the 1-3Gyr age group. The period distribution of the halo Miras closely matches that of the Miras of Fornax. The lack of old Miras suggests that the majority of the halo Miras likely do not originate from the Sagittarius dwarf spheroidal galaxy, which is believed to be older than 5Gyr.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: carbon - stars: variables: general - Galaxy: halo

CDS comments: Tables 1 and 2 : m51 not identified.

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 - 2024
#notes
1 CRTS J001655.8-440040 C* 00 16 55.7848542144 -44 00 40.760302968   17.6 14.71     C 9 0
2 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 683 1
3 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 796 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11040 1
5 NAME Sagittarius Stream St* 02 22 +00.0           ~ 865 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17261 1
7 [MAG2004] 35 C* 08 59 55.6935006192 -77 53 05.534383488   20.1 17.2     C 6 0
8 HE 1107-2105 C* 11 09 59.6769861072 -21 22 00.819827544   17.17 14.07 11.89 11.087 C 12 0
9 [MAG2004] 37 C* 11 41 42.3741855984 -33 41 33.217593864   18.5   16.0   C 6 0
10 [MAG2004] 41 C* 13 47 23.0341847136 -34 47 23.428030056   17.7 14.64     C 6 0
11 [MAG2004] 11 C* 13 59 20.6381892936 -30 23 39.456328128     18.46     C 8 0
12 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2100 0
13 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14211 0
14 [MAG2004] 48 C* 18 46 50.2843677504 -56 14 02.960539440   18.9 17.2     C 4 0
15 IRAS 19065-7827 C* 19 14 24.1475373504 -78 22 41.369558736   18.5 16.6     C 6 0
16 [MAG2004] 50 C* 19 31 38.5143846600 -30 02 30.505531704   19.5 17.0     C 6 0
17 [MAG2004] 52 C* 19 37 34.1400637944 -35 32 37.696582320     13.13     C 6 0
18 [MAG2004] 16 C* 19 42 19.0153439040 -35 19 37.715587176   18.6 15.29     C 6 0
19 [MAG2004] 17 C* 19 42 21.3135433584 -32 11 04.074572148   19.0   14.42   C 7 0
20 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1553 0
21 [MAG2004] 18 C* 19 48 50.6472719832 -30 58 31.871468100     17.48     C 10 0
22 [MAG2004] 19 C* 19 53 30.1692775680 -38 35 59.474318208   19.2 14.62 14.88   C 7 0
23 [MAG2004] 20 C* 20 13 19.4312716584 -23 41 43.948798116   16.00 13.61 12.67   C 5 0
24 [MAG2004] 22 C* 20 54 54.5531335176 -28 28 56.763032880   18.6       C 5 0
25 [MAG2004] 24 C* 22 06 53.6728276464 -25 06 28.205022420   18.0 14.07     C 11 0
26 [MAG2004] 25 C* 22 17 09.9218987328 -26 07 03.384034752   18.4       C 9 0
27 [MAG2004] 53 C* 22 43 50.3477263824 -57 01 23.497968432   14.7 13.6   10.81 C 9 0
28 [MAG2004] 54 C* 22 46 28.5016216416 -27 26 58.230493728   19.4 18.2     C 6 0
29 [MAG2004] 55 C* 22 47 38.0040347232 -78 27 17.311057020   16.7 14.8     C 5 0
30 [MAG2004] 26 C* 23 17 21.0828657960 -24 11 42.456489828   17.8       C 6 0
31 [MAG2004] 28 C* 23 25 31.3891842000 -30 10 55.956148896   18.4       C 6 0

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