2019ApJ...878L..21S

Query : 2019ApJ...878L..21S

2019ApJ...878L..21S - Astrophys. J., 878, L21-L21 (2019/June-2)

Survey of Li-rich giants among Kepler and LAMOST fields: determination of Li-rich giants' evolutionary phase.

SINGH R., REDDY B.E., BHARAT KUMAR Y. and ANTIA H.M.

Abstract (from CDS):

In this Letter, we report the discovery of 24 new super Li-rich (A(Li) >= 3.2) giants of He-core burning phase at the red clump region. Results are based on a systematic search of a large sample of about 12,500 giants common to the LAMOST spectroscopic and Kepler time-resolved photometric surveys. The two key parameters derived from Kepler data are an average period spacing (Δp) between l = 1 mixed gravity-dominated g-modes and average large frequency-separation (Δν) l = 0 acoustic p-modes, which suggest all the Li-rich giants are in the He-core burning phase. This is the first unbiased survey subjected to a robust technique of asteroseismic analysis to unambiguously determine the evolutionary phase of Li-rich giants. The results provide strong evidence that the Li enhancement phenomenon is associated with giants in the He-core burning phase post He-flash, rather than any other phase on the red giant branch with an inert He-core surrounded by a H-burning shell.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): asteroseismology - stars: abundances - stars: evolution - stars: late-type - stars: low-mass

Simbad objects: 31

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Number of rows : 31
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 2818-990-1 * 01 36 48.6267051648 +40 24 11.524408632           ~ 6 0
2 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
3 TYC 429-2097-1 RG* 17 53 46.0737657528 +06 42 41.196653892   12.68 10.97     ~ 11 0
4 BD+44 3032 RG* 18 59 29.1710361672 +45 07 57.583590132   10.39 9.34     K0 16 0
5 UCAC4 684-065062 RG* 19 08 36.1588752720 +46 41 21.253098480   13.228 12.216 12.051   ~ 48 0
6 GSC 03554-01451 HB* 19 17 12.5082454368 +51 45 11.382474384   12.52 11.40 11.17   G9.5III 37 0
7 2MASS J19202208+4942450 RG* 19 20 22.0937618640 +49 42 44.945912268           ~ 9 0
8 TYC 3555-1010-1 RG* 19 20 30.9424259784 +52 03 28.940388444   12.00 11.10     G8.5IIIb 19 0
9 UCAC4 668-075193 RG* 19 21 37.5292099032 +43 25 26.312048724   14.444 13.468 13.231   ~ 7 0
10 TYC 3146-218-1 RG* 19 24 06.9388868496 +44 23 22.340539032   12.81 10.88     K1IV 31 0
11 TYC 3134-265-1 RG* 19 28 25.6366451688 +37 41 23.242481304   12.20 11.02     G8IIIb 45 0
12 UCAC4 672-072369 RG* 19 29 05.8657311864 +44 23 46.274824968   13.904 12.500 12.198   K3III 29 0
13 UCAC4 647-069468 RG* 19 29 35.9520448248 +39 13 47.469004968   15.021 13.928 13.731   ~ 8 0
14 2MASS J19301726+3852008 RG* 19 30 17.2558848240 +38 52 00.848457264           G3III 9 0
15 2MASS J19305319+4942362 RG* 19 30 53.1906446280 +49 42 36.169266528           K3III 27 0
16 2MASS J19311443+4521372 HB* 19 31 14.4286928256 +45 21 37.161543204           K3III 28 0
17 UCAC4 639-068754 RG* 19 31 29.5797148992 +37 42 26.011918476   14.554 13.377 13.138   ~ 12 0
18 UCAC4 684-068189 HB* 19 31 54.9293978280 +46 39 57.117241440   13.829 12.519 12.161   K2III 30 0
19 2MASS J19330718+4632482 * 19 33 07.1872111968 +46 32 48.276811248           K1III 8 0
20 TYC 3139-2428-1 HB* 19 34 00.8248803816 +41 08 49.230141720   12.30 11.64     ~ 15 0
21 UCAC4 645-072596 HB* 19 34 43.9879712064 +38 58 56.543921688   13.762 12.444 12.041   ~ 19 0
22 UCAC4 678-073382 RG* 19 35 21.0326197776 +45 24 56.185513308   15.245 14.312 14.065   ~ 7 0
23 TYC 3564-1558-1 HB* 19 36 33.9396770568 +49 38 35.035521396   11.99 11.30     G9.5III 30 0
24 2MASS J19371354+4704327 * 19 37 13.5471840936 +47 04 32.731224024           ~ 14 0
25 TYC 3139-659-1 HB* 19 38 38.7999780024 +40 06 19.163640420   12.46 11.25     ~ 26 0
26 UCAC4 669-075530 RG* 19 38 48.7360722288 +43 38 59.415903852   14.870 13.610 13.260   G8III 21 0
27 2MASS J19404105+4646331 RG* 19 40 41.05968 +46 46 33.1644           ~ 14 0
28 2MASS J19411367+4003382 HB* 19 41 13.6692983051 +40 03 38.196221649     13.59   12.31 ~ 60 0
29 2MASS J19422465+4241050 * 19 42 24.6478958232 +42 41 05.017041420           ~ 7 0
30 2MASS J19474449+4356063 * 19 47 44.4966825312 +43 56 06.329011092           G9III 13 0
31 UCAC4 682-073002 RG* 19 52 44.7061556400 +46 21 44.863784928   14.696 13.351 13.054   ~ 25 0

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