2004AJ....127..875D

Query : 2004AJ....127..875D

2004AJ....127..875D - Astron. J., 127, 875-896 (2004/February-0)

Short-period variable stars in the M31 halo.

DOLPHIN A.E., SAHA A., OLSZEWSKI E.W., THIM F., SKILLMAN E.D., GALLAGHER J.S. and HOESSEL J.

Abstract (from CDS):

We report the findings of a new search for RR Lyrae stars in an M31 halo field located 40' from the nucleus of the galaxy along the minor axis. We detected 37 variable stars, of which 24 are classified as RR Lyrae and the others are ambiguous. Estimating a completeness fraction of ∼24%, we calculate that there are approximately 100 RR Lyrae stars in the field, which is consistent with what is expected from deep Hubble Space Telescope (HST) color-magnitude diagrams. We calculate a mean magnitude of <g≥25.15±0.03, which we interpret to mean that the mean metallicity of RR Lyrae stars is significantly lower than that of the M31 halo as a whole. The presence of ancient, metal-poor stars opens the possibility that initially the M31 halo appeared much like the Milky Way halo.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Individual: Messier Number: M31 - Galaxies: Local Group - Stars: Variables: Other

Nomenclature: Table 2: [DSO2004] VNN (Nos V01-V37).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 37

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Number of rows : 37
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 PvdB 15 RR* 00 45 20.73 +40 49 45.8     24.62     ~ 3 0
3 PvdB 23 RR* 00 45 21.58 +40 49 53.2     25.42     ~ 3 0
4 PvdB 5 RR* 00 45 21.96 +40 49 19.7     25.26     ~ 3 0
5 PvdB 14 RR* 00 45 22.20 +40 49 42.1     25.33     ~ 3 0
6 PvdB 2 RR* 00 45 22.88 +40 49 41.0     25.70     ~ 3 0
7 PvdB 21 RR* 00 45 23.56 +40 47 01.1     25.40     ~ 3 0
8 PvdB 8 RR* 00 45 23.97 +40 48 19.6     24.99     ~ 3 0
9 PvdB 13 RR* 00 45 24.42 +40 48 42.0     25.46     ~ 3 0
10 PvdB 28 RR* 00 45 24.48 +40 47 24.2     24.81     ~ 3 0
11 PvdB 25 RR* 00 45 25.16 +40 48 45.8     25.70     ~ 3 0
12 PvdB 1 RR* 00 45 25.33 +40 47 54.1     24.75     ~ 3 0
13 PvdB 10 RR* 00 45 25.92 +40 48 27.3     25.31     ~ 3 0
14 DESI J011.3598+40.7875 RR* 00 45 26.3522 +40 47 15.254     25.70     ~ 4 0
15 EV* M31 V1156 EB* 00 45 26.52 +40 48 11.9     25.00     ~ 3 0
16 PvdB 3 RR* 00 45 26.67 +40 49 06.8     24.83     ~ 3 0
17 PvdB 6 RR* 00 45 26.73 +40 48 56.9     25.60     ~ 3 0
18 PvdB 17 RR* 00 45 26.92 +40 48 46.8     25.22     ~ 3 0
19 PvdB 9 RR* 00 45 27.06 +40 48 03.1     25.70     ~ 3 0
20 PvdB 12 RR* 00 45 27.35 +40 47 53.0     25.53     ~ 3 0
21 PvdB 22 RR* 00 45 27.47 +40 48 57.8     25.41     ~ 3 0
22 PvdB 4 RR* 00 45 27.84 +40 48 26.4     25.40     ~ 3 0
23 PvdB 20 RR* 00 45 28.02 +40 47 25.2     24.55     ~ 3 0
24 PvdB 11 RR* 00 45 28.49 +40 47 56.9     24.80     ~ 3 0
25 PvdB 16 RR* 00 45 28.94 +40 49 52.1     24.74     ~ 3 0
26 PvdB 32 RR* 00 45 29.29 +40 47 34.3     25.26     ~ 3 0
27 PvdB 30 RR* 00 45 29.56 +40 48 02.5     25.31     ~ 3 0
28 PvdB 7 RR* 00 45 29.95 +40 47 51.2     24.60     ~ 3 0
29 PvdB 26 RR* 00 45 31.28 +40 48 54.1     25.25     ~ 3 0
30 PvdB 31 RR* 00 45 31.48 +40 47 47.2     24.87     ~ 3 0
31 PvdB 19 RR* 00 45 31.99 +40 47 37.1     25.34     ~ 3 0
32 PvdB 24 RR* 00 45 32.65 +40 48 17.0     25.40     ~ 3 0
33 PvdB 18 RR* 00 45 33.12 +40 47 36.1     25.43     ~ 3 0
34 Ross 34 LM* 03 28 53.1411558437 +37 22 56.808690977   12.43 11.11 10.54   esdK7 75 0
35 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
36 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 837 0
37 BD+17 4708 SB* 22 11 31.3756832854 +18 05 34.177983548 9.73 9.91 9.46 9.03 8.70 sdF8 580 0

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