2015A&A...576A.113Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.19CET15:16:19

2015A&A...576A.113Z - Astronomy and Astrophysics, volume 576A, 113-113 (2015/4-1)

Stellar substructures in the solar neighbourhood. IV. Kinematic Group 1 in the Geneva-Copenhagen survey.

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

Abstract (from CDS):

A combined study of kinematics and chemical composition of stars is one of the most promising tools of research in Galaxy formation. The main goal in this field of research is to reconstruct the formation history of our Galaxy, to reveal the origin of the thick disc, and to find remnants of ancient mergers. We determine detailed elemental abundances in stars belonging to the so-called Group 1 of the Geneva-Copenhagen survey (GCS) and compare the chemical composition with the Galactic thin- and thick-disc stars, with the GCS Group 2 and Group 3 stars, as well as with several kinematic streams of similar metallicities. 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 Fibre-fed Echelle Spectrograph 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 37 stars of Group 1 is -0.20±0.14dex. Investigated Group 1 stars can be separated into three age subgroups. Along with the main 8- and 12-Gyr-old populations, a subgroup of stars younger than 5Gyr can be separated as well. 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 to that of the Galactic thick disc and differs slightly from those in Hercules, Arcturus, and AF06 stellar streams. The similar chemical composition of stars in Group 1, as well as in Group 2 and 3, with that in stars of the thick disc might suggest that their formation histories are linked. The chemical composition pattern together with the kinematic properties and ages of stars in the investigated GCS groups provide 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.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/576/A113): table4.dat table5.dat>

Status in Simbad:  could be processed

Simbad objects: 62

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Number of rows : 62

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 3795 PM* 00 40 32.7956054102 -23 48 17.719009278   6.84 6.14     K0VFe-1.5CH-1.3 173 0
2 HD 4607 PM* 00 47 57.3653566626 -09 20 47.331232396   8.25 7.74     F7V 40 0
3 NAME Sgr Stream St* 02 22 +00.0           ~ 621 0
4 HD 15777 SB* 02 33 53.7092339385 +49 30 21.795383740       7.4   G0 33 0
5 HD 22872 PM* 03 42 41.6950958445 +51 10 23.425397106 8.580 8.500   7.6   F9V 32 0
6 HD 25123 PM* 04 03 21.9264156735 +63 16 51.233179751   8.74 8.12     G0 11 0
7 HD 40040 PM* 05 57 01.7762844691 +15 44 28.915599537   8.85   7.8   G0 43 0
8 HD 49409 ** 06 48 39.37749 +07 37 20.4000   9.26 8.95 8.48   G2 69 0
9 HD 52711 PM* 07 03 30.4588797095 +29 20 13.496987787 6.57 6.53   5.6   G0V 221 0
10 HD 60779 PM* 07 36 01.4305286351 -03 09 06.376296453   7.74 7.18     G1V 32 0
11 HD 67088 PM* 08 07 36.1056610803 +30 40 58.480715457       8.3   G5 11 0
12 HD 67587 PM* 08 10 11.4839983 +35 27 17.960875   7.14   6.3   F8 41 0
13 HD 76095 ** 08 54 55.98706 +26 11 53.8459       7.62   G1V 77 0
14 HD 77408 PM* 09 03 15.7432160603 +32 52 53.169137445   7.53   6.8   F6IV 65 0
15 HD 78558 PM* 09 08 25.2378567417 -15 08 41.237446346   7.91 7.34     G0.5V 127 0
16 HD 88371 PM* 10 11 48.0685636384 +23 45 18.705316029   9.06   8.0   G2V 81 0
17 HD 88446 PM* 10 12 19.0773304082 +17 17 57.051756021   8.40   7.5   Gwl 101 0
18 HD 90508 ** 10 28 03.88212 +48 47 05.6554 7.09 7.03   5.98   F9-V 224 1
19 HD 109498 PM* 12 34 58.1890566134 +23 08 53.921813698   9.35   8.3   G3V 26 0
20 HD 111367 PM* 12 48 34.0809371256 +26 35 49.280406806   9.41   8.4   G1V 34 0
21 * e Vir PM* 13 16 46.5161591991 +09 25 26.967205938   5.81   4.8   G0V 496 1
22 * 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 2109 0
23 HD 127334 PM* 14 29 36.8091010490 +41 47 45.289229258 7.370 7.050   5.9   G5VCH0.3 149 0
24 HD 135694 PM* 15 11 28.9141250054 +71 50 27.423108033   9.75   8.7   K0 28 0
25 HD 136064 PM* 15 14 38.3392641428 +67 20 48.194332500   5.66   4.8   F8V 160 0
26 HD 138750 PM* 15 33 40.2404313750 +09 21 12.466004576       7.6   F8 20 0
27 HD 140209 PM* 15 42 05.7019132343 +10 58 38.728899439       7.9   G0 26 0
28 HD 149105 PM* 16 30 14.9574491554 +47 57 08.569504923 7.630 7.550   6.6   G0V 41 0
29 HD 149890 PM* 16 36 26.0008402790 +30 56 30.056695569   7.66   6.8   F8V 51 0
30 HD 150433 PM* 16 41 08.2147823122 -02 51 26.202219924   7.861 7.22 6.80 8.70 G5V 91 1
31 * zet Her SB* 16 41 17.16104 +31 36 09.7873 3.640 3.430 2.800 2.31 1.99 G0IV 519 0
32 HD 156617 PM* 17 18 39.2720899134 -01 30 35.633339285   8.66 8.02     G3V 20 0
33 HD 156893 PM* 17 19 46.3969231772 +06 33 13.457927488       7.7   G5 34 0
34 * w Her PM* 17 20 39.5675395123 +32 28 03.877348066 6.08 6.01 5.39 4.89 4.56 G0V 415 0
35 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11155 0
36 * 35 Dra PM* 17 49 27.0338711993 +76 57 46.357717746   5.53   4.7   F6IV-Vs 88 0
37 * ksi Her LP* 17 57 45.8857114 +29 14 52.367509 5.34 4.64 3.70 3.01 2.55 G8.5III 220 0
38 BD+40 3374 PM* 18 26 55.4921203633 +40 42 50.526698001   10.71   9.3   K0: 22 0
39 HD 171009 PM* 18 30 57.5516768789 +33 55 58.819313490       8.0   G5 25 0
40 HD 171242 PM* 18 31 30.0640695102 +45 00 35.073809837   8.55   7.6   G2 29 0
41 HD 178478 PM* 19 08 18.8764145130 +15 01 02.637826059   8.88 8.23     G5 10 0
42 HD 181047 PM* 19 17 53.6965096399 +25 22 11.010745893   9.02   7.9   G8V 27 0
43 HD 186411 PM* 19 42 39.4082171618 +37 39 32.199211571   8.71 8.07     G0 13 0
44 * 17 Cyg PM* 19 46 25.5997765489 +33 43 39.342745085   5.46   4.7   F5.5IV-V 248 0
45 * omi Aql PM* 19 51 01.6437560393 +10 24 56.595177367   5.66   4.8   F8V 416 0
46 HD 188326 PM* 19 53 01.5411431243 +38 46 24.140925456   8.34   7.1   G8IVv 52 0
47 HD 195019 PM* 20 28 18.6366531368 +18 46 10.179936391 7.730     6.5   G1V 225 1
48 HD 198300 PM* 20 46 35.47971 +59 51 09.4930       8.2   G0 41 1
49 * 4 Equ SB* 21 05 26.6758028199 +05 57 29.788837811       5.6   F8V 121 0
50 HD 206373 ** 21 41 00.6715694006 +29 20 25.334642451   9.42 9.04 8.77   G0V 29 0
51 HD 210483 PM* 22 10 26.1624878567 +18 47 49.581239842   8.16   7.2   G4 64 0
52 HD 211476 PM* 22 17 15.1410078833 +12 53 54.564339883   7.64   6.7   G2 86 0
53 HD 217511 PM* 23 01 02.1685920962 +22 23 28.442168019 8.120 8.110   7.4   F5 20 0
54 HD 219175 PM* 23 14 07.4752698450 -08 55 27.581287520   8.12 7.56     F7V 80 0
55 * 12 And PM* 23 20 53.2636166052 +38 10 56.362398270   6.212 5.765     F5V 89 0
56 NAME Hyades Moving Group MGr ~ ~           ~ 232 1
57 NAME Pleiades Moving Group MGr ~ ~           ~ 231 1
58 NAME Hercules Stream MGr ~ ~           ~ 174 0
59 NAME Galactic Bar reg ~ ~           ~ 845 0
60 NAME AF06 Stream MGr ~ ~           ~ 11 0
61 NAME Sirius Moving Group MGr ~ ~           ~ 74 0
62 NAME Arcturus Stream MGr ~ ~           ~ 64 1

    Equat.    Gal    SGal    Ecl

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2020.01.19-15:16:19

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