2020MNRAS.496.2902M


Query : 2020MNRAS.496.2902M

2020MNRAS.496.2902M - Mon. Not. R. Astron. Soc., 496, 2902-2909 (2020/August-2)

Lithium and beryllium in the Gaia-Enceladus galaxy.

MOLARO P., CESCUTTI G. and FU X.

Abstract (from CDS):

Data from Gaia DR2 and The Apache Point Observatory Galactic Evolution Experiment surveys revealed a relatively new component in the inner Galactic halo, which is likely the dynamical remnant of a disrupted dwarf galaxy named Gaia-Enceladus that collided with the Milky Way about 10 Gyr ago. This merging event offers an extraordinary opportunity to study chemical abundances of elements in a dwarf galaxy, since they are generally hampered in external galaxies. Here, we focus on 7Li and 9Be in dwarf stars that are out of reach even in Local Group galaxies. Searching in GALAH, Gaia-ESO survey and in literature, we found several existing 7Li abundance determinations of stars belonging to the Gaia-Enceladus galaxy. The 7Li abundances of stars at the low metallicity end overlap with those of the Galactic halo. These are effective extragalactic 7Li measurements, which suggest that the 7Li Spite plateau is universal, as is the cosmological 7Li problem. We found a 7Li-rich giant out of 101 stars, which suggests a small percentage similar to that of the Milky Way. We also collect 9Be abundance for a subsample of 25 Gaia-Enceladus stars from literature. Their abundances share the Galactic [Be/H] values at the low metallicity end but grow slower with [Fe/H] and show a reduced dispersion. This suggests that the scatter observed in the Milky Way could reflect the different 9Be evolution patterns of different stellar components that are mixed-up in the Galactic halo.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: abundances - Galaxy: halo - Galaxy: stellar content - galaxies: abundances - galaxies: individual: Gaia-Enceladus - primordial nucleosynthesis

VizieR on-line data: <Available at CDS (J/MNRAS/496/2902): table1.dat table2.dat galah.dat>

Status at CDS : All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 63

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Number of rows : 63
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 HD 3567 PM* 00 38 31.9473242153 -08 18 33.392826667 9.54 9.70 9.23     F7/8wF3 207 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11040 1
3 SK 143 * 01 10 55.7567270880 -72 42 56.223094032 12.15 12.98 12.89 12.78 11.64 O9.7Ib 79 0
4 CD-61 282 PM* 01 36 05.8495294416 -61 05 03.492150337   10.63 10.10     G0 67 0
5 BD-17 484 PM* 02 31 25.7656327453 -16 59 05.044365275   10.890 10.470 10.159 9.871 F0Vwl 70 0
6 L 126-11 Pe* 02 36 48.8459558712 -60 54 52.802772480   12.74 12.19     ~ 9 0
7 G 4-36 PM* 02 43 22.0483919796 +13 25 56.981522451   11.989 11.471 11.133 10.795 ~ 69 0
8 LP 651-4 PM* 02 44 11.7179917488 -05 27 00.003085992   12.35 11.97     ~ 25 0
9 G 75-56 Pe* 03 00 23.0286652283 -05 57 49.691602691   12.397 11.950 11.627 11.296 ~ 33 0
10 G 5-19 PM* 03 11 26.5406862511 +12 37 09.570643728   11.77   11.0   ~ 46 0
11 G 37-37 PM* 03 23 38.3621465925 +33 58 30.186765910       11.4   F5: 35 0
12 BD+11 468 PM* 03 24 50.3620750643 +12 15 23.703069372 11.16 11.314 10.749 10.394 10.038 G0V 81 0
13 BD+20 571 PM* 03 27 39.4522217875 +21 02 34.994793492   11.36   10.8   G0 57 0
14 HD 34328 Pe* 05 13 05.2760918664 -59 38 44.265435029   9.95 9.5     G0wA8V 130 0
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17259 1
16 CD-29 2277 PM* 05 28 50.9297117788 -29 53 47.778591790   12.13 11.61     F6 66 0
17 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4907 2
18 L 595-22 Pe* 05 56 24.7419040752 -27 51 32.361761700   12.31 12.38     sdG 164 0
19 CD-48 2445 PM* 06 41 26.6601460416 -48 13 14.894690484   10.94 10.54     F8 28 0
20 CD-57 1633 HV* 07 06 28.9516977109 -57 27 29.118927115   10.04 9.54     F7V 101 0
21 G 107-50 Pe* 07 09 52.9062858144 +42 39 13.282734204       11.3   ~ 15 0
22 G 88-10 SB* 07 10 23.7929838816 +24 20 40.198088508   12.30 11.8 11.7   ~ 56 0
23 G 89-14 SB* 07 22 31.4521055914 +08 49 13.014694367       10.2   F2 60 0
24 UCAC3 133-60515 PM* 07 25 43.9210232952 -23 51 17.027537832   12.48 12.06 11.98   sdF5.0: 7 0
25 HD 59392 Pe* 07 28 03.2212916981 -38 00 41.278587469   10.17 9.7     F0V 92 0
26 BD+24 1676 Pe* 07 30 41.2662525096 +24 05 10.248524088   11.15 10.7 10.4   F 127 0
27 G 234-28 SB* 08 14 16.3298724002 +68 55 19.468395583       10.8   G0 29 0
28 HD 74000 Pe* 08 40 50.8036114756 -16 20 42.516208237 9.84 10.09 9.66     F2 268 0
29 UCAC4 405-046168 Pe* 08 44 15.9771649296 -09 07 02.633404332   13.018 12.499 12.481   ~ 3 0
30 BD+09 2190 Pe* 09 29 15.5615542183 +08 38 00.467004388   11.54   10.8   sdA5 133 0
31 Ross 889 Pe* 09 40 43.2053340378 +01 00 29.511836741       10.39   sdA4 160 0
32 TYC 9213-2091-1 Pe* 09 53 24.8391967512 -70 35 25.443241728   12.96 12.52     ~ 4 0
33 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5814 6
34 TYC 7174-224-1 Pe* 10 03 20.5745679384 -31 54 16.852225968   12.54 12.16     ~ 3 0
35 BD+29 2091 PM* 10 47 23.1623890044 +28 23 55.925628075   10.72   10.1   F5 141 0
36 BD+36 2165 PM* 11 12 47.9997679646 +35 43 43.885058670 9.98 10.19 9.76 9.34 9.02 G0 133 0
37 BD+51 1696 Pe* 11 46 35.1556060454 +50 52 54.680145444 10.32 10.47   9.5   sdG0 153 0
38 Ross 453 PM* 12 10 55.7733238889 +00 23 54.332076195   11.53   10.9   F2 108 0
39 WT 414 PM* 13 24 14.8271272176 -46 23 41.499098124   12.26 11.75     ~ 4 0
40 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3401 0
41 BD+34 2476 PM* 13 59 09.4837849799 +33 51 39.379962282 10.25 10.44   9.7   sdF5 160 0
42 Ross 841 Pe* 14 02 30.0900761861 -05 39 05.181979951   11.508 11.149 10.866 10.576 sdA3 151 0
43 G 166-47 Pe* 14 50 02.5424166048 +32 38 56.236545312     11.9 11.8   sdF3 21 0
44 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 930 0
45 TYC 9429-2667-1 Pe* 15 53 03.2198218584 -75 55 07.602044196   12.54 12.27     ~ 3 0
46 CD-71 1234 Pe* 16 07 44.6410532021 -71 21 01.360284611   10.81 10.44     ~ 39 0
47 BD+02 3375 Pe* 17 39 45.5948675731 +02 24 59.606824535 10.18 10.40 9.92 9.47 9.12 A5 199 0
48 UCAC4 201-164577 Pe* 17 40 57.1399975128 -49 55 32.848263624   13.220 12.641 12.567   ~ 3 0
49 BD+01 3597 Pe* 18 07 56.5963171590 +01 52 32.701833212   11.53 11.1 10.8   sdF5 66 0
50 G 21-22 PM* 18 39 09.7158608590 +00 07 14.320687061   11.285 10.775 10.437 10.086 G4 64 0
51 CD-38 13129 Pe* 18 50 21.4826273136 -38 38 47.531904324   12.66 12.06     ~ 11 0
52 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 2164 2
53 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1061 0
54 BPS CS 22873-0139 SB* 20 05 55.1466054456 -59 17 11.461854084     13.8 13.810   ~ 34 0
55 HD 193901 PM* 20 23 35.8471605389 -21 22 14.226959304 9.08 9.22 8.67 8.17 7.87 F7V 280 0
56 UCAC4 238-176476 Pe* 20 27 02.6590536912 -42 31 06.825033372   13.595 13.085 13.085   ~ 3 0
57 G 24-25 SB* 20 40 16.1053839864 +00 33 19.651652964       10.2   CEMP-s 50 0
58 BD+17 4708 SB* 22 11 31.3756832854 +18 05 34.177983548 9.73 9.91 9.46 9.03 8.70 sdF8 567 0
59 BD+07 4841 PM* 22 18 36.5059714907 +08 26 44.962089682   10.84   10.1   G0 115 0
60 BD+75 839 ** 22 35 52.6308240770 +76 29 32.568422416       9.1   G0wl 43 0
61 UCAC4 091-075654 Pe* 22 59 07.6470247152 -71 52 14.800602720   13.266 12.775 12.715   ~ 3 0
62 BD+02 4651 PM* 23 19 40.4500387773 +03 22 16.694733495   10.67   9.9   sdF6 112 0
63 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 489 0

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