2025ApJ...986...44Z

Query : 2025ApJ...986...44Z

2025ApJ...986...44Z - Astrophys. J., 986, 44 (2025/June-2)

Li-rich Unevolved Stars from LAMOST-MRS.

ZHOU Z.-M., SHI J.-R., BI S.-L., YAN H.-L., PAN K.-K., DING M.-Y., WANG J.-T., LIU S., LI C.-Q., ZHOU Y.-T., ZHANG J.-H., FANG X.-S., ZHANG X.-F., CHEN T.-Y., XIE X.-J., TANG Y.-J., YAN T.-S. and LI G.

Abstract (from CDS):

Based on the spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope medium-resolution spectroscopic survey, we select a sample of 88 Li-rich unevolved star candidates. We redetermine their photospheric lithium abundances, A(Li), through the spectral synthesis method, and take the nonlocal thermodynamic equilibrium (NLTE) into account. It is found that there are 62 stars with A(Li) ranging from 3.33 to 4.59 dex. Among them, 23 stars are young stellar objects. There are 33 super Li-rich unevolved stars with A(Li) higher than 3.8 dex, and 24 of them are newly identified. The NLTE corrections for A(Li) are negative, with a maximum value of around 0.5 dex. Our results suggest that the mechanisms such as mass transfer in binary systems, accretion of circumstellar materials, and diffusion processes may contribute to lithium enrichment in their respective samples.

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

Journal keyword(s): Binary stars - Chemically peculiar stars - Circumstellar matter - Lithium stars - Overabundances - Stellar abundances - Young stellar objects

Simbad objects: 70

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Number of rows : 70
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 UCAC4 743-001793 Y*? 00 12 36.8775914068 +58 31 08.455258855   15.411 14.208 13.765   ~ 11 0
2 UCAC4 646-006093 * 01 36 15.8509066393 +39 10 06.042357349           ~ 1 0
3 TYC 3296-2005-1 * 02 45 46.4886824904 +45 03 37.128132432   12.09 11.57     ~ 1 0
4 TYC 3706-386-1 * 03 13 50.4699563328 +55 03 23.386409172   11.93 11.35     ~ 2 0
5 TYC 3319-968-1 * 03 17 56.0724997512 +49 37 57.072589860   12.41 12.57     ~ 1 0
6 IRAS 03219+3056 Y*O 03 25 06.7179168960 +31 06 52.823175192   14.229 12.851 12.534   G7 15 0
7 UCAC4 700-027351 * 03 45 59.0717679202 +49 59 53.552255216           ~ 1 0
8 UCAC4 541-007480 * 03 49 10.2081592766 +18 02 10.579953710           ~ 1 0
9 UCAC4 615-011299 * 03 52 19.730 +32 51 30.06           ~ 1 0
10 UCAC4 617-012261 Y*? 03 56 35.5527378312 +33 21 31.270130784   13.798 12.690 12.581   ~ 7 0
11 UCAC4 620-012892 SB* 03 56 49.6887044400 +33 55 15.243044772   13.879 12.706 12.462   ~ 5 0
12 TYC 1261-1137-1 * 03 59 00.8749153632 +22 23 52.438145496   12.90 12.05     ~ 2 0
13 UCAC4 600-011689 * 04 05 52.4803077000 +29 55 44.778295704   14.641 13.371 12.976   ~ 10 0
14 UCAC4 598-011888 * 04 13 01.560 +29 34 45.80           ~ 1 0
15 UCAC4 569-010383 * 04 18 08.4306129891 +23 40 50.270351795   15.625 14.675 14.504   ~ 2 0
16 UCAC4 721-034342 * 04 27 20.3911178852 +54 08 23.875969330           ~ 1 0
17 UCAC4 569-011300 * 04 33 01.6716869063 +23 40 01.232256198           ~ 1 0
18 ZTF J043811.74+131047.0 BY* 04 38 11.7434684808 +13 10 47.070300540   15.622 14.321 14.076   ~ 4 0
19 UCAC4 587-012821 * 04 41 41.0497485799 +27 20 01.113222297           ~ 1 0
20 V* V1205 Tau TT* 04 44 23.5482972360 +20 17 17.477873160   13.70 12.67     K1 21 0
21 V* RW Aur TT* 05 07 49.5662483 +30 24 05.177426   10.86 9.60 9.95   K1/5e+K5e 816 0
22 UCAC4 567-015258 * 05 14 31.4177523320 +23 15 17.433898768           ~ 3 0
23 UCAC4 625-021963 * 05 16 49.7021251346 +34 52 47.307083169           ~ 1 0
24 UCAC4 440-009448 Y*O 05 18 38.4009711984 -02 08 30.248969388   14.020 12.982 12.931   ~ 11 0
25 UCAC4 460-010150 * 05 23 45.2132355816 +01 49 19.409431548   11.926 11.262 12.091   ~ 16 0
26 UCAC4 459-010155 * 05 23 45.8311748256 +01 39 47.675818872   13.954 13.000 12.611   ~ 15 0
27 UCAC4 434-009960 Y*? 05 24 28.5968505213 -03 20 01.023131106   14.835 13.691 13.269   K3 11 0
28 UCAC4 433-009959 * 05 24 57.9685844066 -03 29 21.206783912           ~ 1 0
29 UCAC4 443-009853 * 05 25 38.9257300730 -01 29 34.918766587           ~ 4 0
30 TYC 4757-455-1 * 05 26 16.5225078216 -03 08 05.103970980   12.91 12.24     ~ 4 0
31 V* IT Aur EB* 05 27 38.1508619808 +32 12 32.738999004           ~ 9 0
32 HD 287927 V* 05 30 48.0178638648 +02 59 34.619407332   11.49 10.72 10.47 9.765 F2 16 0
33 TYC 4766-937-1 Em* 05 32 43.8046145904 -00 27 15.210541260   11.95 11.51     ~ 12 0
34 UCAC4 451-011087 Y*O 05 33 13.0850222304 +00 10 30.102659436   12.801 12.015 11.828   ~ 21 0
35 Haro 5-70 Or* 05 34 25.8217267490 -01 21 06.534772321     12.9     G3 25 0
36 UCAC4 446-010887 * 05 34 55.7666583684 -00 48 31.883411072           ~ 6 0
37 UCAC2 31450746 Y*O 05 35 30.2119757928 -00 43 05.308328460   12.132 11.390 11.219 10.48 ~ 10 0
38 UCAC4 442-010940 Y*? 05 36 43.3833240144 -01 36 58.936296924   14.102 13.021 12.657   ~ 6 0
39 UCAC4 447-010862 * 05 37 20.2076365019 -00 43 35.832827623           ~ 6 0
40 UCAC4 446-011156 TT* 05 37 33.7815279384 -00 53 51.855521532           K4 7 0
41 RX J0538.5-0154 Y*O 05 38 31.3717485456 -01 54 03.078036072   12.208 11.350 11.132 10.32 ~ 19 0
42 CVSO 1855 TT* 05 39 03.2452282968 +02 01 07.399233544   15.091 14.078 13.755   K3e 3 0
43 CVSO 1930 TT* 05 43 04.5578157408 -02 09 06.448313970   16.922 15.209 14.368   K3e 4 0
44 UCAC4 463-013213 Y*O 05 49 23.1982410792 +02 28 27.228772668   15.39 14.04 13.31   K3 8 0
45 UCAC4 629-030411 * 06 06 54.6006904557 +35 41 02.283604232   14.030 13.372 13.305   ~ 2 0
46 UCAC4 519-020774 * 06 07 35.3425929890 +13 39 45.383421533           ~ 1 0
47 UCAC4 555-024417 * 06 13 12.8339952757 +20 56 29.432937817           ~ 1 0
48 UCAC4 570-026442 * 06 15 43.5022851153 +23 50 51.760922631           ~ 1 0
49 UCAC4 580-028035 * 06 25 59.3877144839 +25 55 40.580928694           ~ 1 0
50 UCAC4 474-019269 * 06 27 10.4335375462 +04 38 02.407005549           ~ 1 0
51 TYC 745-379-1 * 06 32 06.0010998936 +14 37 44.651880480   11.58 11.23     ~ 1 0
52 UCAC4 486-025997 * 06 35 36.4575371674 +07 03 11.935686106           ~ 1 0
53 UCAC4 470-020902 * 06 41 10.8366746070 +03 48 06.404971519           ~ 1 0
54 TYC 1342-1121-1 * 06 41 48.0084289008 +20 49 37.526532132   11.63 11.36     ~ 1 0
55 UCAC4 564-031714 * 06 42 29.5569571283 +22 44 16.611326587           ~ 2 0
56 TYC 1342-716-1 * 06 46 46.4037981888 +21 56 13.130615076   11.55 11.20     ~ 3 0
57 TYC 771-1089-1 * 07 23 31.2628004952 +12 16 23.738937528   13.142 12.701 12.649   ~ 1 0
58 TYC 2973-1258-1 * 08 11 16.7041894200 +39 42 16.475087988   11.14 10.70     ~ 1 0
59 UCAC4 646-050572 * 12 33 11.0263671997 +39 07 53.829542118   15.622 15.034 14.960   ~ 2 0
60 UCAC4 609-048230 * 12 53 40.7569335514 +31 43 39.031765470           ~ 1 0
61 UCAC4 639-047150 Pe* 13 14 57.7665995611 +37 41 10.686614709   14.164 13.725 13.578   ~ 7 0
62 UCAC4 596-052739 * 14 45 57.0638595011 +29 10 00.777861311   12.867 12.012 12.007   ~ 2 0
63 TYC 3499-1891-1 * 16 38 10.9101121560 +45 16 37.281934740   11.770 11.185 11.086   ~ 2 0
64 UCAC4 657-059237 EB* 16 43 37.5111709968 +41 18 57.314718180   13.456 12.672 12.452 11.35 G6 7 0
65 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
66 Cl* NGC 6397 K 1657 * 17 41 06.5232252264 -53 43 29.290531008       15.948   ~ 6 0
67 NGC 6633 47 * 18 26 32.2712411664 +06 23 08.952117000   11.380 10.933 10.832   A9 39 0
68 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0
69 TYC 2699-2897-1 * 20 49 59.0486703432 +35 56 02.198522976   11.84 11.52     ~ 1 0
70 UCAC4 568-123722 * 21 23 05.3019028589 +23 25 02.624233470           ~ 1 0

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