2016ApJ...823...36T


Query : 2016ApJ...823...36T

2016ApJ...823...36T - Astrophys. J., 823, 36-36 (2016/May-3)

A Non-LTE study of silicon abundances in giant stars from the Si I infrared lines in the zJ-band.

TAN K., SHI J., TAKADA-HIDAI M., TAKEDA Y. and ZHAO G.

Abstract (from CDS):

We investigate the feasibility of Si i infrared (IR) lines as Si abundance indicators for giant stars. We find that Si abundances obtained from the Si i IR lines based on the local thermodynamic equilibrium (LTE) analysis show large line-to-line scatter (mean value of 0.13 dex), and are higher than those from the optical lines. However, when non-LTE effects are taken into account, the line-to-line scatter reduces significantly (mean value of 0.06 dex), and the Si abundances are consistent with those from the optical lines. The typical average non-LTE correction of [Si/Fe] for our sample stars is about -0.35 dex. Our results demonstrate that the Si i IR lines could be reliable abundance indicators, provided that the non-LTE effects are properly taken into account.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: evolution - stars: abundances - stars: atmospheres - stars: late-type

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1296 4
2 HD 6268 Pe* 01 03 18.1716378504 -27 52 49.953768852   9.725 9.046 8.601   F/Gw 150 0
3 BPS CS 31082-0001 RG* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 283 0
4 HD 13979 Pe* 02 15 20.8534060680 -25 54 54.872825148   9.81 9.18     F/Gw 88 0
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6696 1
6 * 10 Leo SB* 09 37 12.6793421832 +06 50 08.960833176   6.050 5.009     K1III 93 0
7 HD 108317 Pe* 12 26 36.8319587208 +05 18 09.023783400       7.7   G2IVm-5 164 0
8 HD 115444 Pe* 13 16 42.4590842616 +36 22 52.692135420   9.77 8.97 8.3 7.88 G9V 240 0
9 HD 121135 Pe* 13 53 33.5447403552 +02 41 41.185079880   10.14 9.37     KIIvw 65 0
10 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 827 0
11 * 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 2283 0
12 HD 126587 Pe* 14 27 00.3636631296 -22 14 38.992940592   9.88 9.60 8.75   CEMP-no 132 0
13 HE 1523-0901 Pe* 15 26 01.0697532504 -09 11 38.885639784   12.37 11.50 10.476 9.863 CEMP 76 0
14 BD+23 3130 Pe* 17 32 41.6247211304 +23 44 11.625460773     8.9 8.6   G0III 133 0
15 HD 166161 PM* 18 09 40.6841536776 -08 46 45.603012144 9.53 9.13 8.16     G0wF0 139 0
16 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1522 0
17 HD 186478 SB* 19 45 14.1409752672 -17 29 27.071239056   10.116 9.302 8.527 7.961 K2III 149 0
18 BD-18 5550 Pe* 19 58 49.7371417608 -18 12 11.140126164 10.18 10.03 9.35 9.04 8.74 CEMP-no 172 0
19 HD 195636 PM* 20 32 48.9463898400 -09 21 51.724664928   10.13 9.57     A9(V)(w) 91 0
20 HD 204543 * 21 29 28.2126852216 -03 30 55.353564216   9.17 8.30 7.99   F6/8(V) 135 0
21 HD 216143 Pe* 22 50 31.0883724288 -06 54 49.554279360   8.78 7.81 7.44   G2/3(IV)(we) 141 0
22 HD 221170 Pe* 23 29 28.8087143040 +30 25 57.849303180 9.43 8.74 7.66     CEMP-r 283 0
23 NAME Galactic Bulge reg ~ ~           ~ 4096 0

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2023.06.01-22:07:51

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