2025ApJ...980..265M

Query : 2025ApJ...980..265M

2025ApJ...980..265M - Astrophys. J., 980, 265 (2025/February-3)

High Lithium Abundance Connection with the Chromospheric Helium in Red Giants: Spectroscopic and Asteroseismic Analyses.

MALLICK A., SNEDEN C., REDDY B.E. and AFSAR M.

Abstract (from CDS):

We present a study of correlations between high Li abundances and strong chromospheric He Iλ10830 absorption-line strengths in Kepler field giant stars. Our sample includes 84 giants with detectable solar-like oscillations in their light curves, and their Li abundances come from the literature or are measured here using LAMOST medium-resolution spectra. Evolutionary phases are determined through asteroseismic analysis, with mixed-mode period spacing (ΔP) used to infer the time evolution of red clump (RC) giants. Near-IR observations of the He Iλ10830 line were obtained with the high-resolution Habitable-zone Planet Finder spectrograph on the Hobby-Eberly Telescope. We find high Li abundances and strong He I lines exclusively among RC giants, with their absence in red giant branch stars suggesting a shared origin linked to the He flash. Additionally, a steady decline in He I strength with decreasing Li abundance among RC giants indicates a correlation between these properties. Older, Li-normal RC giants are He weak, while most younger, super-Li-rich giants are He strong, suggesting temporal evolution of both phenomena. We hypothesize that the core He flash and subsequent subflashes may enhance Li abundances in RC giant photospheres and trigger heightened chromospheric activity, leading to stronger He Iλ10830 lines in younger RCs. Over time, following He flash, chromospheric activity diminishes, resulting in weaker He I lines in older, Li-normal RCs.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Red giant clump - Stellar oscillations - Stellar abundances - Stellar chromospheres - Helium burning

Simbad objects: 84

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Number of rows : 84
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 TYC 3127-432-1 RG* 18 50 13.1844661104 +41 39 45.068720040   12.96 11.35     G8III 33 0
2 BD+42 3187 RG* 18 54 16.9544655840 +42 59 00.384912816   10.495 9.939 10.086   G2 101 0
3 KOI-981 RG* 18 54 56.7319913520 +44 42 47.986868124   11.883 10.87 10.676   K0IV 54 0
4 TYC 3540-388-1 RG* 18 56 00.1071468360 +45 05 30.352101252   12.39 11.10     G8III 33 0
5 2MASS J18562429+4438032 RG* 18 56 24.2920876488 +44 38 03.337737612           K1IV 38 0
6 UCAC4 652-066332 * 18 58 31.3580462304 +40 17 36.792659616   13.928 12.558 12.224   K1.5III 15 0
7 BD+44 3032 RG* 18 59 29.1710361672 +45 07 57.583590132   10.39 9.34     K0 16 0
8 TYC 3123-1448-1 * 18 59 41.5127031168 +41 09 20.471569452   12.73 11.64     K1.5IV 3 0
9 TYC 3131-1339-1 HB* 18 59 59.9913224544 +44 36 11.823283800   12.20 11.14     K0III 35 0
10 HD 177151 HB* 19 01 06.5479845288 +48 02 07.980905544   8.02 7.04     K0 44 0
11 TYC 3124-1260-1 RG* 19 01 37.8082125552 +39 31 53.826684204   13.41 12.08     K0II 35 0
12 TYC 3549-1225-1 HB* 19 01 43.8090729528 +49 23 06.255443004   12.53 11.65     K1.5III 45 0
13 TYC 3132-1087-1 HB* 19 03 04.1397528744 +43 31 07.013070156   13.14 12.23     K2III 33 0
14 UCAC4 664-070941 * 19 04 12.8091285384 +42 45 20.868384816   13.923 12.976 12.693   K0III 13 0
15 TYC 3550-94-1 RG* 19 09 10.4942597112 +49 03 50.647962384   11.05 9.90     K1.5III 22 0
16 2MASS J19091067+4316190 HB* 19 09 10.6701980640 +43 16 18.999496164           K2III 34 0
17 2MASS J19091874+4234532 HB* 19 09 18.7408353600 +42 34 53.281448976           G6V 34 0
18 TYC 3550-1536-1 HB* 19 09 53.6249341080 +48 46 32.531541168   13.13 12.09     K2III 30 0
19 2MASS J19103277+4203166 HB* 19 10 32.7835512144 +42 03 16.501466448           K0III 27 0
20 HD 179421 HB* 19 10 50.6161659624 +39 10 17.977985760   9.36 7.7957     K5 32 0
21 UCAC4 653-070983 RG* 19 11 19.9719726312 +40 32 42.000688212   13.697 12.491 12.140   K2II-III 31 0
22 TYC 3129-531-1 RG* 19 11 22.8287284992 +42 49 48.837204696   13.23 11.63     K1IV 39 0
23 TYC 3133-799-1 RG* 19 11 25.8343508616 +43 09 37.286651268   11.495 10.520 10.288   G6V 13 0
24 TYC 3129-1368-1 * 19 12 27.5199509184 +41 42 31.179800880   12.09 11.16     G7IIa 4 0
25 TYC 3125-2265-1 C*? 19 13 12.2462418024 +40 49 23.415431304   13.23 12.13     K2III 17 0
26 2MASS J19133848+4055180 HB* 19 13 38.4848103576 +40 55 18.067121544           K1IV 12 0
27 TYC 3125-2310-1 HB* 19 13 39.1172473224 +40 11 04.687016100   11.99 11.43     G8IV-V 48 0
28 TYC 3125-538-1 HB* 19 16 41.9999352456 +40 26 15.667386396   12.01 10.80     K0III 36 0
29 GSC 03554-01451 HB* 19 17 12.5082454368 +51 45 11.382474384   12.52 11.40 11.17   G9.5III 37 0
30 TYC 3129-61-1 * 19 17 45.5085970560 +43 01 43.867558380   12.86 12.01     G9IIIb 4 0
31 2MASS J19175551+4946243 HB* 19 17 55.5192898608 +49 46 24.374104896           G8.5IIIb 32 0
32 TYC 3542-1885-1 RG* 19 18 16.4670376200 +45 06 52.645070304   12.40 11.19     K0III 38 0
33 TYC 3133-401-2 Er* 19 19 10.1787880656 +43 45 56.702049552   11.88 10.86     K1.5III 22 0
34 UCAC4 674-070673 RG* 19 20 09.8238737664 +44 44 34.887974604   14.183 12.901 12.653   G6V 19 0
35 2MASS J19202208+4942450 RG* 19 20 22.0937618640 +49 42 44.945912268           ~ 9 0
36 UCAC4 668-075193 RG* 19 21 37.5292099032 +43 25 26.312048724   14.444 13.468 13.231   ~ 7 0
37 2MASS J19234066+4336129 RG* 19 23 40.6588472808 +43 36 12.918601692           K1IV 37 0
38 TYC 3146-218-1 RG* 19 24 06.9388868496 +44 23 22.340539032   12.81 10.88     K1IV 31 0
39 TYC 3134-72-1 HB* 19 26 54.9140653416 +37 56 29.921981424   11.79 10.75     ~ 50 0
40 TYC 3134-261-1 HB* 19 27 34.6652186496 +38 50 49.330825260   13.06 12.25     K1II 45 0
41 HD 183507 HB* 19 27 45.4830450912 +47 32 12.955274196   8.70 7.66     K0 32 0
42 TYC 3134-265-1 RG* 19 28 25.6366451688 +37 41 23.242481304   12.20 11.02     G8IIIb 45 0
43 TYC 3543-1163-1 * 19 28 41.2224316416 +45 04 13.392178608   12.65 11.71     K1.5III 17 0
44 TYC 3146-1126-1 RG* 19 28 45.3136783824 +44 15 42.398917704   13.30 11.88     G9IIIb 26 0
45 TYC 3543-1368-1 RG* 19 28 55.0245723336 +46 27 10.693181196   12.43 11.25     K2III 36 0
46 UCAC4 672-072369 RG* 19 29 05.8657311864 +44 23 46.274824968   13.904 12.500 12.198   K3III 29 0
47 UCAC4 647-069468 RG* 19 29 35.9520448248 +39 13 47.469004968   15.021 13.928 13.731   ~ 8 0
48 TYC 2667-624-1 HB* 19 30 01.0670140848 +37 17 33.908743644   12.14 11.16     G8II 45 0
49 2MASS J19301726+3852008 RG* 19 30 17.2558848240 +38 52 00.848457264           G3III 9 0
50 2MASS J19305319+4942362 RG* 19 30 53.1906446280 +49 42 36.169266528           K3III 27 0
51 2MASS J19310054+4525325 * 19 31 00.5337663384 +45 25 32.420850492           K3III 3 0
52 2MASS J19311443+4521372 HB* 19 31 14.4286928256 +45 21 37.161543204           K3III 28 0
53 UCAC4 639-068754 RG* 19 31 29.5797148992 +37 42 26.011918476   14.554 13.377 13.138   ~ 12 0
54 2MASS J19313624+4506228 * 19 31 36.2469998568 +45 06 22.813410528           K5II 4 0
55 UCAC4 684-068189 HB* 19 31 54.9293978280 +46 39 57.117241440   13.829 12.519 12.161   K2III 30 0
56 TYC 3560-1487-1 RG* 19 32 53.2740940368 +47 37 09.945280596   12.42 11.81     G8.5IIIb 39 0
57 TYC 3147-1625-1 V* 19 32 59.4161005440 +43 16 32.467527696   11.86 10.63     K2III 8 0
58 UCAC4 664-076206 RG* 19 33 02.7325512600 +42 40 37.565240844   13.100 12.175 11.826   K1IV 35 0
59 TYC 3143-2069-1 RG* 19 33 03.9004249992 +42 49 02.326914516   12.68 11.38     G9IIIb 17 0
60 2MASS J19330718+4632482 * 19 33 07.1872111968 +46 32 48.276811248           K1III 8 0
61 UCAC4 680-070866 HB* 19 33 19.1785841400 +45 50 37.711814352   13.958 12.779 12.381   K2III 20 0
62 UCAC4 667-075648 HB* 19 33 21.4665101064 +43 12 51.595453044   13.948 12.887 12.568   K0III 24 0
63 TYC 3139-2428-1 HB* 19 34 00.8248803816 +41 08 49.230141720   12.30 11.64     ~ 15 0
64 UCAC4 645-072596 HB* 19 34 43.9879712064 +38 58 56.543921688   13.762 12.444 12.041   ~ 19 0
65 TYC 3556-2602-1 * 19 34 46.0180740384 +46 08 28.551173424   13.40 11.40     K1.5III 4 0
66 UCAC4 678-073382 RG* 19 35 21.0326197776 +45 24 56.185513308   15.245 14.312 14.065   ~ 7 0
67 BD+49 3061 * 19 36 18.8482043712 +49 49 26.946226164   10.32 9.49     G8IV 43 0
68 2MASS J19371354+4704327 * 19 37 13.5471840936 +47 04 32.731224024           ~ 14 0
69 UCAC4 669-075530 RG* 19 38 48.7360722288 +43 38 59.415903852   14.870 13.610 13.260   G8III 21 0
70 TYC 3147-1605-1 RG* 19 39 36.8749780632 +43 13 14.115000936   12.78 11.97     K3III 32 0
71 2MASS J19404105+4646331 RG* 19 40 41.05968 +46 46 33.1644           ~ 14 0
72 TYC 3561-1248-1 * 19 41 32.0457214728 +48 12 16.176698856   13.33 11.64     K0IV 2 0
73 UCAC4 671-076757 RG* 19 42 12.3640404792 +44 01 46.014253500   13.895 12.574 12.219   K1.5III 30 0
74 2MASS J19422465+4241050 * 19 42 24.6478958232 +42 41 05.017041420           ~ 7 0
75 UCAC4 671-076913 RG* 19 42 48.0724858824 +44 10 43.255135812   14.101 12.697 12.301   K3III 26 0
76 2MASS J19440599+4250336 * 19 44 05.99831 +42 50 33.6119           ~ 2 0
77 TYC 3561-1447-1 RG* 19 45 25.9717999680 +46 56 36.285510660   12.34 11.39     K1IV 31 0
78 2MASS J19463173+4438477 * 19 46 31.7352515688 +44 38 47.774403204           G8III 3 0
79 TYC 3565-1299-1 HB* 19 46 43.8823081656 +49 34 20.946621360   12.88 11.57     G6V 41 0
80 UCAC4 670-078652 RG* 19 46 49.5041547912 +43 55 48.833930892   13.557 12.214 11.810   K1IV 29 0
81 2MASS J19471835+4458256 * 19 47 18.3549486984 +44 58 25.635368604           G9IIIb 7 0
82 2MASS J19474449+4356063 * 19 47 44.4966825312 +43 56 06.329011092           G9III 13 0
83 UCAC4 684-072128 HB* 19 51 40.3673089560 +46 47 28.061128104   13.508 12.451 12.217   G8III 26 0
84 UCAC4 682-073002 RG* 19 52 44.7061556400 +46 21 44.863784928   14.696 13.351 13.054   ~ 25 0

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