2023ApJ...953...31S

Query : 2023ApJ...953...31S

2023ApJ...953...31S - Astrophys. J., 953, 31 (2023/August-2)

Iron-peak Element Abundances in Warm Very Metal-poor Stars.

SNEDEN C., BOESGAARD A.M., COWAN J.J., ROEDERER I.U., DEN HARTOG E.A. and LAWLER J.E.

Abstract (from CDS):

We have derived new detailed abundances of Mg, Ca, and the Fe-group elements Sc through Zn (Z = 21-30) for 37 main-sequence turnoff very metal-poor stars ([Fe/H] ≲-2.1). We analyzed Keck HIRES optical and near-UV high signal-to-noise spectra originally gathered for a Be abundance survey. Using typically ∼400 Fe-group lines with accurate laboratory transition probabilities for each star, we have determined accurate LTE metallicities and abundance ratios for neutral and ionized species of the 10 Fe-group elements as well as α elements Mg and Ca. We find good neutral/ion abundance agreement for the six elements that have detectable transitions of both species in our stars in the 3100-5800 Å range. Earlier reports of correlated Sc-Ti-V relative overabundances are confirmed, and appear to slowly increase with decreasing metallicity. To this element trio we add Zn; it also appears to be increasingly overabundant in the lowest-metallicity regimes. Co appears to mimic the behavior of Zn, but issues surrounding its abundance reliability cloud its interpretation.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Nucleosynthesis - Chemical abundances - Population II stars - Stellar spectral lines

VizieR on-line data: <Available at CDS (J/ApJ/953/31): table1.dat table2.dat>

Simbad objects: 42

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Number of rows : 42
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 G 130-65 PM* 00 22 38.5912325352 +23 54 31.309930764   12.06   11.5   sdF8: 40 0
2 BD-10 388 Pe* 01 50 32.6462570064 -09 21 02.840259744   10.78 10.4     F3 102 0
3 LP 651-4 PM* 02 44 11.7179917488 -05 27 00.003085992   12.35 11.97     ~ 27 0
4 G 4-37 Pe* 02 44 35.0876406984 +08 28 50.094009408   11.90 11.4 11.0   F7 96 0
5 G 75-56 Pe* 03 00 23.0286652283 -05 57 49.691602691   12.397 11.950 11.627 11.296 ~ 39 0
6 LP 831-70 PM* 03 06 05.4386096664 -22 19 17.828964660   12.043 11.608 11.598   ~ 52 0
7 Ross 570 PM* 03 18 28.9186801755 -07 08 25.552772959   11.647 11.222 10.918 10.618 A6: 56 0
8 BD+03 740 HB* 05 01 16.6226363256 +04 06 37.021736844 9.97 10.17 9.7 9.6   sdF0 182 0
9 G 108-58 SB* 07 10 02.5912948776 -01 17 58.498391400   12.295 11.852 11.516 11.184 ~ 24 1
10 G 88-10 SB* 07 10 23.7929838816 +24 20 40.198088508   12.30 11.8 11.7   ~ 59 0
11 BD+24 1676 Pe* 07 30 41.2662525096 +24 05 10.248524088   11.15 10.7 10.4   F 139 0
12 BD+20 2030 SB* 08 16 07.3522203887 +19 41 51.430977726   11.556 11.189 10.909 10.632 sdF0 60 0
13 BD+09 2190 Pe* 09 29 15.5615542183 +08 38 00.467004388   11.54   10.8   sdA5 144 0
14 HD 83769 ** 09 40 45.78636 +01 01 29.0180   10.53 10.15 10.12   sdF5 68 0
15 HD 84937 Pe* 09 48 56.0992891997 +13 44 39.326709913 8.49 8.68 8.32 7.97 7.70 F8Vm-5 831 0
16 BD+11 2341 PM* 11 17 59.6196766104 +10 47 35.108074032   10.75 10.29     F2 6 0
17 BD+51 1696 Pe* 11 46 35.1556060454 +50 52 54.680145444 10.32 10.47   9.5   sdG0 172 0
18 BD-13 3442 Pe* 11 46 50.6525751264 -14 06 43.458063768   10.662 10.274     CEMP 117 0
19 LP 553-62 Pe* 11 54 25.6303452792 +02 57 47.422732248     11.7 11.6   ~ 23 0
20 BD-04 3208 PM* 12 07 15.0721580835 -05 44 01.612773628   10.40 9.99     A7 154 0
21 HD 109303 PM* 12 33 19.0294913328 +49 18 06.827723352   8.65 8.15     F8 61 0
22 Wolf 1447 Pe* 12 34 25.1299405728 +15 16 48.959531004   12.385 11.976 11.676 11.378 A6 73 0
23 Wolf 1492 Pe* 13 40 02.4921849768 -00 02 18.750053436 11.601 11.832 11.451 11.184 10.892 sdF0: 299 0
24 Ross 841 Pe* 14 02 30.0900761861 -05 39 05.181979951   11.508 11.149 10.866 10.576 sdA3 161 0
25 G 201-5 PM* 14 36 08.3666970497 +55 33 04.605415573   11.93   11.1   sdF6 45 0
26 BD+26 2621 Pe* 14 54 10.7123241110 +25 33 48.927279437   11.40 10.9 10.7   F0 52 0
27 G 169-41 SB* 17 00 30.2671817798 +29 41 49.927339798   13.0   10.9   K4 13 0
28 Wolf 644 Pe* 17 07 06.2796593784 +34 21 34.548890508   12.44 12.0 12.07   ~ 28 0
29 BD+02 3375 Pe* 17 39 45.5948675731 +02 24 59.606824535 10.18 10.40 9.92 9.47 9.12 A5 205 0
30 BD+36 2964 Pe* 17 52 18.0525471888 +36 24 06.619879188     10.3 10.2   sd:F8 42 0
31 BD+01 3597 Pe* 18 07 56.5963171590 +01 52 32.701833212   11.53 11.1 10.8   sdF5 69 0
32 BD+13 3683 SB* 18 33 16.8450962112 +13 09 25.493753160   11.19 10.5 10.0   F5 112 0
33 Ross 711 SB* 18 35 19.1686289616 +28 41 55.415394492   11.83 11.4 11.2   A8 101 0
34 LP 752-17 Pe* 19 25 25.9284634800 -11 56 57.953973768   12.27 11.81     ~ 15 0
35 Ross 656 Pe* 19 29 44.0336036976 +01 01 30.199383300   12.35 11.7 11.4   A8s: 45 0
36 LP 635-14 Pe* 20 26 46.8302881512 -00 37 15.175129512 11.57 11.76 11.33     OB- 45 0
37 LP 815-43 Pe* 20 38 13.2998605176 -20 26 10.850795808   11.31 10.72     ~ 82 0
38 G 24-25 SB* 20 40 16.1053839864 +00 33 19.651652964       10.2   CEMP-s 57 0
39 BD-14 5850 PM* 20 47 34.3988019289 -14 25 33.668099282   11.39 11.00     F5V 38 0
40 G 26-12 Pe* 21 33 36.5718002352 +00 23 43.912696200   12.59 12.15 11.9   sdF5: 54 0
41 G 126-52 PM* 22 04 13.3810303392 +19 32 54.335372892       10.7   sd:F2 41 0
42 CD-24 17504 Pe* 23 07 20.2534619736 -23 52 35.954286096   12.51 12.18     CEMP-no 94 0

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