2022ApJ...929L..14Y

Query : 2022ApJ...929L..14Y

2022ApJ...929L..14Y - Astrophys. J., 929, L14-L14 (2022/April-2)

Discovery of Nine Super Li-rich Unevolved Stars from the LAMOST Survey.

YAN T.-S., SHI J.-R., WANG L., YAN H.-L., ZHOU Z.-M., ZHOU Y.-T., FANG X.-S., LI C.-Q., CHEN T.-Y. and XIE X.-J.

Abstract (from CDS):

Based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) medium-resolution spectroscopic survey (MRS), we report the discovery of nine super Li-rich unevolved stars with A(Li) > 3.8 dex. These objects show unusually high levels of lithium abundances, up to three times higher than the meteoritic value of 3.3 dex, which indicates that they must have experienced a history of lithium enrichment. It is found that seven of our program stars are fast rotators with v sin i > 9 km s–1, which suggests that the accretion of circumstellar matter may be the main contributor to the lithium enhancement of these unevolved stars; however, other sources cannot be excluded.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Chemically peculiar stars - Lithium stars - Circumstellar matter - Stellar rotation

Simbad objects: 17

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Number of rows : 17
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 IRAS 03219+3056 Y*O 03 25 06.7179168960 +31 06 52.823175192   14.229 12.851 12.534   G7 15 0
2 Ass Per OB 2 As* 03 42.2 +33 26           ~ 350 0
3 UCAC4 569-010383 * 04 18 08.4306129891 +23 40 50.270351795   15.625 14.675 14.504   ~ 2 0
4 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1453 0
5 UCAC4 440-009448 Y*O 05 18 38.4009711984 -02 08 30.248969388   14.020 12.982 12.931   ~ 11 0
6 UCAC4 451-011087 Y*O 05 33 13.0850222304 +00 10 30.102659436   12.801 12.015 11.828   ~ 21 0
7 RX J0538.5-0154 Y*O 05 38 31.3717485456 -01 54 03.078036072   12.208 11.350 11.132 10.32 ~ 19 0
8 UCAC4 629-030411 * 06 06 54.6006904557 +35 41 02.283604232   14.030 13.372 13.305   ~ 2 0
9 UCAC4 558-043026 Pe* 07 41 02.0658780670 +21 32 46.931885079       14.045   ~ 7 0
10 UCAC4 686-049450 Pe* 07 58 16.3981269241 +47 03 43.321360032   15.169 14.582 13.904   ~ 8 0
11 UCAC4 646-050572 * 12 33 11.0263671997 +39 07 53.829542118   15.622 15.034 14.960   ~ 2 0
12 UCAC4 596-052739 * 14 45 57.0638595011 +29 10 00.777861311   12.867 12.012 12.007   ~ 2 0
13 TYC 3499-1891-1 * 16 38 10.9101121560 +45 16 37.281934740   11.770 11.185 11.086   ~ 2 0
14 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
15 Cl* NGC 6397 K 1657 * 17 41 06.5232252264 -53 43 29.290531008       15.948   ~ 6 0
16 NGC 6633 47 * 18 26 32.2712411664 +06 23 08.952117000   11.380 10.933 10.832   A9 39 0
17 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0

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