2006A&A...449..127Z


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.06CET06:57:00

2006A&A...449..127Z - Astronomy and Astrophysics, volume 449, 127-134 (2006/4-1)

Chemical abundances of 32 mildly metal-poor stars.

ZHANG H.W. and ZHAO G.

Abstract (from CDS):

The formation scenario of the Galactic thick disk is an unresolved problem. Chemical abundances in long-lived dwarf stars of the thin and thick disks provide information of the Galactic disk formation. We present photospheric abundances of the O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Ni, and Ba elements for 32 mildly metal-poor stars with [Fe/H]~-0.7. According to their kinematics, age, and [α/Fe], sample stars are identified to thin disk, thick disk, and halo population memberships. Element abundances for sample stars are discussed as a function of metallicity. High resolution and high signal-to-noise ratio spectra were obtained with the Coude Echelle Spectrograph mounted on the 2.16m telescope at the National Astronomical Observatories (Xinglong, China). Effective temperatures were estimated from colour indices, and surface gravities from Hipparcos parallaxes. Stellar abundances were determined from a differential LTE analysis. The kinematics parameters were calculated from the parallax, proper motion, and radial velocity. Stellar ages were determined from theoretical stellar evolution tracks. The average age of the thick disk stars is older than the thin disk stars. Our element abundance results extend and confirm previous works. The oxygen and other α-elements (Mg, Si, Ca, and Ti) abundances of thin and thick disk stars show distinct trends at [Fe/H]≤-0.60. The [Al/Fe] behaviour is exactly as an α-element, although the separation for [Na/Fe] of thin and thick disk stars is not clear. The elements V, Cr, and Ni follow Fe very closely, and there is no offset between thin and thick disk stars, but the Sc and Mn abundance trends of the thin and thick disk stars are different, and [Ba/Fe] of thin disk and thick disk stars shows different behaviour.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: kinematics - Galaxy: disk

VizieR on-line data: <Available at CDS (J/A+A/449/127): stars.dat table1.dat table3.dat>

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 - 2020
#notes
1 HD 3454 SB* 00 37 56.9908771510 +47 24 27.774425328   8.00 7.53     F5 47 0
2 HD 6834 * 01 09 35.2624358051 +39 46 51.768219338   8.83 8.41     F2 43 0
3 BD+29 366 PM* 02 10 24.5274383291 +29 48 23.663384860 9.27 9.35 8.77 8.24 7.85 G3 120 0
4 HD 18768 PM* 03 02 52.2709217591 +47 06 37.983582352   7.294 6.723     F8 80 0
5 HD 22879 Pe* 03 40 22.0654223510 -03 13 01.124769689 7.146 7.222 6.667 6.346 6.016 G0VmF2 424 0
6 HD 25173 PM* 04 07 24.0241870896 +75 10 30.157694448   7.70   6.9   F8V 53 0
7 HD 28474 PM* 04 30 59.0480084891 +35 35 59.394959596       8.2   F5 21 0
8 HD 45205 PM* 06 30 15.6717330766 +60 47 02.837117661       8.2   G0 49 0
9 HD 49732 PM* 06 51 50.8950773887 +41 34 34.723973764   8.26 7.85     F8 35 0
10 HD 59374 PM* 07 30 29.0167349664 +18 57 40.617055091   9.03   8.2   F9 105 0
11 HD 59984 PM* 07 32 05.7631181661 -08 52 52.773345653   6.431 5.916     G0VFe-1.6CH-0.5 184 0
12 HD 62301 PM* 07 44 56.1933366656 +39 33 22.916336799 7.220 7.270   6.4   F8V 118 0
13 HD 64385 PM* 07 56 10.2004150084 +50 32 27.413335022 9.290 9.350   8.5   G5 32 0
14 HD 76932 PM* 08 58 43.9328634171 -16 07 57.805389219 6.47 6.39 5.86     G2VFe-1.8CH-1 363 0
15 HD 94028 PM* 10 51 28.1254469804 +20 16 38.965521484 8.51 8.69 8.22 7.82 7.54 F8 325 0
16 * 62 UMa SB* 11 41 34.2530322378 +31 44 45.767610849 6.08 6.16 5.75 5.37 5.09 F5 101 0
17 HD 105755 PM* 12 10 15.8755100459 +54 29 17.314317646   9.14 8.59     G0Vw 68 0
18 HD 106516 SB* 12 15 10.55731 -10 18 44.6354 6.44 6.57 6.11     F9VFe-1.7CH-0.7 385 0
19 HD 108076 PM* 12 24 45.8892348867 +38 19 07.461955799   8.58   7.7   G0V 98 0
20 HD 114762 SB* 13 12 19.7467346230 +17 31 01.611425890 7.78         F9VgF8mF4+M6?V 502 1
21 HD 157089 PM* 17 21 07.0567914512 +01 26 34.981760941 7.60 7.59 7.01 6.46 6.14 F8VgF8mF6 233 0
22 HD 189558 PM* 20 01 00.2452564415 -12 15 20.355884232   8.27 7.72     F8/G2V 169 1
23 HD 194598 PM* 20 26 11.9185966774 +09 27 00.429262518 8.62 8.82 8.34 7.90 7.56 F8 283 0
24 HD 195633 PM* 20 32 23.9917031781 +06 31 03.251333868 9.05 9.03 8.52     G0Vw 125 0
25 HD 200580 SB* 21 04 07.4073421467 +02 59 40.012308707 7.82 7.85   7.0   F9V 148 0
26 HD 201889 ** 21 11 59.52350 +24 10 05.3897 8.60 8.64 8.05 7.52 7.15 G1V 147 0
27 HD 204155 PM* 21 26 42.9051661431 +05 26 29.899070605   9.03   8.1   F7V 115 0
28 * 15 Peg PM* 21 52 29.9167067804 +28 47 36.751682373 5.82 5.95 5.53     F2V 224 0
29 HD 215257 PM* 22 43 50.7183139841 +03 53 12.629544211   7.93   7.1   F5V 133 0
30 * sig Peg PM* 22 52 24.0744875405 +09 50 08.386917893   5.64   4.9   F6V 251 0
31 HD 219617 ** 23 17 05.04375 -13 51 03.5971 8.41 8.60 8.14 7.70 7.37 F8 296 0
32 HD 221377 PM* 23 31 19.7266174528 +52 24 38.501793771   7.96 7.57     F7Vw 83 0

    Equat.    Gal    SGal    Ecl

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2019.12.06-06:57:00

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