2020AJ....160...41G

Query : 2020AJ....160...41G

2020AJ....160...41G - Astron. J., 160, 41-41 (2020/July-0)

Elemental abundances in M31: iron and alpha element abundances in M31's outer halo.

GILBERT K.M., WOJNO J., KIRBY E.N., ESCALA I., BEATON R.L., GUHATHAKURTA P. and MAJEWSKI S.R.

Abstract (from CDS):

We present [Fe/H] and [α/Fe] abundances, derived using spectral synthesis techniques, for stars in M31's outer stellar halo. The 21 [Fe/H] measurements and 7 [α/Fe] measurements are drawn from fields ranging from 43 to 165 kpc in projected distance from M31. We combine our measurements with existing literature measurements, and compare the resulting sample of 23 stars with [Fe/H] and 9 stars with [α/Fe] measurements in M31's outer halo with [α/Fe] and [Fe/H] measurements, also derived from spectral synthesis, in M31's inner stellar halo (r < 26 kpc) and dSph galaxies. The stars in M31's outer halo have [α/Fe] patterns that are consistent with the largest of M31's dSph satellites (And I and And VII). These abundances provide tentative evidence that the [α/Fe] abundances of stars in M31's outer halo are more similar to the abundances of Milky Way halo stars than to the abundances of stars in M31's inner halo. We also compare the spectral synthesis-based [Fe/H] measurements of stars in M31's halo with previous photometric [Fe/H] estimates, as a function of projected distance from M31. The spectral synthesis-based [Fe/H] measurements are consistent with a large-scale metallicity gradient previously observed in M31's stellar halo to projected distances as large as 100 kpc.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxies - Local Group - Andromeda Galaxy - Galaxy stellar halos - Stellar abundances

Nomenclature: Table 1: [GWK2020] And R NNNNNNN N=21.

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 [GWK2020] And III 8000203 * 00 35 12.60 +36 21 07.5     23.32   22.33 ~ 2 0
2 [GWK2020] And III 3007800 * 00 35 29.64 +36 25 02.3     23.49   22.32 ~ 2 0
3 [GWK2020] And III 4002365 * 00 35 30.57 +36 19 15.8           ~ 1 0
4 [GWK2020] And III 4001981 * 00 35 30.76 +36 15 31.2           ~ 1 0
5 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
6 [GWK2020] And III 3006203 * 00 35 39.14 +36 24 37.3           ~ 1 0
7 [GWK2020] And III 4002335 * 00 35 39.72 +36 21 09.3           ~ 1 0
8 [GWK2020] And III 2001738 * 00 36 00.41 +36 37 05.4           ~ 1 0
9 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
10 [GWK2020] And I 7000728 * 00 45 17.07 +37 54 36.3     22.29   21.17 ~ 2 0
11 [GWK2020] And I 7000611 * 00 45 18.22 +37 55 59.4     22.64   21.36 ~ 2 0
12 [GWK2020] And I 6000883 * 00 45 19.80 +37 58 28.7     23.64   21.78 ~ 2 0
13 [GWK2020] And I 7000018 * 00 45 24.58 +37 55 30.8     23.34   21.96 ~ 2 0
14 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
15 [GWK2020] And I 1007432 * 00 45 43.67 +38 11 55.7           ~ 1 0
16 [GWK2020] And I 1007290 * 00 45 46.98 +38 11 28.0           ~ 1 0
17 [GWK2020] And I 2006273 * 00 46 41.27 +38 03 03.6           ~ 1 0
18 [GWK2020] And XIV 5007496 * 00 51 28.10 +29 42 10.6           ~ 1 0
19 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
20 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
21 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
22 [GWK2020] And V 3008720 * 01 09 54.41 +47 35 18.3     22.16   20.74 ~ 2 0
23 [GWK2020] And V 3007277 * 01 09 56.51 +47 37 49.8     23.03   21.53 ~ 2 0
24 [GWK2020] And V 3007616 * 01 10 02.05 +47 36 25.5     23.54   22.40 ~ 2 0
25 [GWK2020] And V 2006635 * 01 10 06.50 +47 42 41.2           ~ 1 0
26 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
27 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
28 [GWK2020] And XV 497 * 01 14 58.26 +38 00 59.1           ~ 1 0
29 [GWK2020] And XV 2070 * 01 15 01.53 +38 05 21.4           ~ 1 0
30 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
31 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
32 NAME Local Group GrG ~ ~           ~ 9325 0

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