2014A&A...563A..53Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.18CET04:53:23

2014A&A...563A..53Z - Astronomy and Astrophysics, volume 563A, 53-53 (2014/3-1)

Stellar substructures in the solar neighbourhood. III. Kinematic group 2 in the Geneva-Copenhagen survey.

ZENOVIENE R., TAUTVAISIENE G., NORDSTROEM B. and STONKUTE E.

Abstract (from CDS):

From correlations between orbital parameters, several new coherent groups of stars were recently identified in the Galactic disc and suggested to correspond to remnants of disrupted satellites. To reconstruct their origin at least three main observational parameters - kinematics, chemical composition and age - must be known. We determine detailed elemental abundances in stars belonging to the so-called Group 2 of the Geneva-Copenhagen Survey and compare the chemical composition with Galactic thin- and thick-disc stars, as well as with the Arcturus and AF06 streams (Arifyanto & Fuchs, 2006A&A...449..533A). The aim is to search for chemical signatures that might give information about the formation history of this kinematic group of stars. High-resolution spectra were obtained with the FIES spectrograph at the Nordic Optical Telescope, La Palma, and were analysed with a differential model atmosphere method. Comparison stars were observed and analysed with the same method. The average value of [Fe/H] for the 32 stars of Group 2 is -0.42±0.10dex. The investigated group consists mainly of two 8- and 12-Gyr-old stellar populations. Abundances of oxygen, α-elements, and r-process-dominated elements are higher than in Galactic thin-disc dwarfs. This elemental abundance pattern has similar characteristics as that of the Galactic thick-disc. The similarity in chemical composition of stars in Group 2 with that in stars of the thick-disc might suggest that their formation histories are linked. The chemical composition together with the kinematic properties and ages of stars in the stars investigated provides evidence of their common origin and possible relation to an ancient merging event. A gas-rich satellite merger scenario is proposed as the most likely origin. Groups 2 and 3 of the Geneva-Copenhagen Survey might have originated in the same merging event.

Abstract Copyright:

Journal keyword(s): stars: abundances - Galaxy: disk - Galaxy: formation - Galaxy: evolution

Simbad objects: 48

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Number of rows : 48

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 224817 PM* 00 00 58.2793839501 -11 49 25.464459129   9.393 9.113     G2V 58 0
2 HD 10519 PM* 01 42 14.9182735680 -17 53 19.463599669   8.06 7.45     G2/3V 70 0
3 HD 12782 * 02 06 41.7753010975 +51 19 41.018878741   9.27 8.40     G5 9 0
4 HD 16397 PM* 02 38 27.8624496391 +30 48 59.859046004 7.98 7.96 7.37 6.84 6.49 G0V 136 0
5 HD 18757 PM* 03 04 09.6344824917 +61 42 20.959343616   7.25   6.2   G1.5V 115 0
6 HD 21543 PM* 03 28 21.0835428647 -06 31 51.315860581   9.113 9.125     G2V 102 0
7 HD 24156 PM* 03 50 41.6163747590 -04 37 20.309520437   8.83 8.15     G5/6V 33 0
8 HD 29587 SB* 04 41 36.3164521477 +42 07 06.420947055 7.940 7.890 7.280 6.74 6.39 G2V 137 1
9 HD 30649 PM* 04 51 43.5714471304 +45 50 02.842355226 7.59 7.55 6.97 6.45 6.10 G2 211 0
10 HD 37739 PM* 05 41 46.7584549332 +22 52 13.257076154       7.7   F5 35 0
11 HD 38767 ** 05 48 15.080280 +03 53 56.15520   9.29 8.89 8.34   F5V 13 0
12 HD 41330 PM* 06 06 08.5353544759 +35 23 15.859636484   6.72   5.8   G0V 108 0
13 HD 43318 PM* 06 15 34.2651080690 -00 30 43.872371701   6.15 5.65     F5V 162 0
14 * chi Cnc PM* 08 20 03.8606964664 +27 13 03.746404123   5.61   4.8   F6V 278 0
15 * 51 LMi PM* 11 05 15.4745795131 +25 12 06.856879744   8.18   7.2   G0 70 0
16 HD 108954 PM* 12 30 50.1357900550 +53 04 35.786317103       5.9   F9V 107 0
17 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 373 2
18 HD 114606 PM* 13 11 21.4029562561 +09 37 33.539749216 9.41 9.34 8.72 8.18 7.81 G4 112 1
19 HD 121533 PM* 13 55 48.3431907674 +12 26 19.711357104   9.21   8.2   G2 29 0
20 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2113 0
21 HD 131582 PM* 14 53 41.5724163105 +23 20 42.804733565 10.363 9.601 8.608 8.046 7.545 K3V 56 0
22 HD 132142 PM* 14 55 11.0440401768 +53 40 49.247114921 8.95 8.59 7.80 7.13 6.69 K1V 215 0
23 BD+68 813 PM* 14 59 03.0422591687 +67 44 59.260537590   10.33   9.3   G5 20 0
24 * 9 UMi SB* 15 00 26.9557205923 +71 45 55.648592364   7.27   6.3   G0 53 0
25 HD 137687 SB* 15 24 17.9437941689 +60 32 57.864142182       6.8   G9 26 0
26 HD 139457 PM* 15 37 59.2139776030 +10 14 23.558934538 7.580 7.620   6.8   F6 77 0
27 NAME HERCULES SUPERCL SCG 15 47 +18.2           ~ 137 1
28 HD 143291 PM* 15 58 32.0271585300 +27 44 23.959427554   8.78   7.5   G9V 80 0
29 HD 152123 PM* 16 45 47.3818350275 +69 38 14.874007824   9.02 8.49     G5 17 0
30 * h Dra SB* 16 56 01.6892483 +65 08 05.263139   5.37   4.6   F8V 187 0
31 HD 156802 PM* 17 20 00.1631819374 -08 01 23.361911873   8.65 7.97     G6V 44 0
32 HD 157466 PM* 17 22 27.6461103752 +24 52 45.934455673       6.6   F8V 108 0
33 HD 158226 PM* 17 26 43.1970011642 +31 04 37.894858895   9.09   8.1   G1V 101 0
34 HD 165401 SB* 18 05 37.4544371448 +04 39 25.798102148 7.443 7.399 6.786 6.432 6.09 G2V 202 0
35 HD 170357 PM* 18 26 37.7259243207 +46 05 01.601435002   8.93   7.9   G1V 44 0
36 BD+31 3330 PM* 18 40 54.8822220703 +31 31 59.089578474   9.44   8.0   K2.5V 52 0
37 HD 176377 PM* 18 58 51.0031145311 +30 10 50.314585200   7.37   6.4   G1V 98 0
38 HD 190404 PM* 20 03 52.1270833529 +23 20 26.466434692 8.490 8.080 7.270 6.759 6.314 K1V 207 0
39 HD 200580 SB* 21 04 07.4073421467 +02 59 40.012308707 7.82 7.85   7.0   F9V 148 0
40 HD 201099 PM* 21 07 43.8397499322 -05 33 57.180665647   8.12 7.60     F7V 79 0
41 HD 215594 PM* 22 45 54.0844049534 +32 51 32.067438749   9.29 8.71     G5 8 0
42 HD 221830 PM* 23 35 28.8946565621 +31 01 01.832810749   7.45   6.5   G2 142 0
43 NAME Galactic Bar reg ~ ~           ~ 853 0
44 NAME Arcturus Stream MGr ~ ~           ~ 64 1
45 NAME PLEIADES SUPERCL Cl* ~ ~           ~ 17 0
46 NAME Hyades Moving Group MGr ~ ~           ~ 232 1
47 NAME AF06 Stream MGr ~ ~           ~ 11 0
48 NAME Local Group GrG ~ ~           ~ 6798 0

    Equat.    Gal    SGal    Ecl

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2020.02.18-04:53:23

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