J/A+A/613/A63 Lithium content for 148 Pleiades stars (Bouvier+, 2018)
The lithium-rotation connection in the 125 Myr-old Pleiades cluster.
Bouvier J, Barrado D., Moraux E., Stauffer J., Rebull L., Hillenbrand L.,
Bayo A., Boisse I., Bouy H., DiFolco E., Lillo-Box J., Morales Calderon M.
<Astron. Astrophys. 613, A63 (2018)>
=2018A&A...613A..63B 2018A&A...613A..63B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, K-type ; Abundances
Keywords: stars: abundances - stars: low-mass - stars: rotation -
open clusters and associations: individual: Melotte 22 (Pleiades) -
stars: solar-type
Abstract:
The evolution of lithium abundance over a star's lifetime is
indicative of transport processes operating in the stellar interior.
Aims. We revisit the relationship between lithium content and rotation
rate previously reported for cool dwarfs in the Pleiades cluster.
Methods. We derive new LiI 670.8nm equivalent width measurements from
high-resolution spectra obtained for low-mass Pleiades members. We
combine these new measurements with previously published ones, and use
the Kepler/K2 rotational periods recently derived for Pleiades cool
dwarfs to investigate the lithium-rotation connection in this
125Myr-old cluster. Results. The new data confirm the correlation
between lithium equivalent width and stellar spin rate for a sample of
51 early K-type members of the cluster, where fast rotating stars are
systematically lithium-rich compared to slowly rotating ones. The
correlation is valid for all stars over the (J-Ks) color range
0.50-0.70mag, corresponding to a mass range from about 0.75 to
0.90M☉, and may extend down to lower masses. Conclusions. We
argue that the dispersion in lithium equivalent widths observed for
cool dwarfs in the Pleiades cluster reflects an intrinsic scatter in
lithium abundances, and suggest that the physical origin of the
lithium dispersion pattern is to be found in the pre-main sequence
rotational history of solar-type stars.
Description:
Lithium equivalent widths, abundances, and stellar rotational periods
are reported for 148 stars in the Pleiades cluster, partly from
published values, partly from new spectroscopic measurements.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 105 148 Stellar parameters and lithium content for our
sample of 148 stars
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See also:
J/AJ/106/1059 : Lithium in the Pleiades (Soderblom+, 1993)
J/A+A/335/183 : Pleiades low-mass stars rotational velocities (Queloz+ 1998)
J/MNRAS/408/475 : HATNet Pleiades Rotation Period Catalogue (Hartman+, 2010)
J/A+A/577/A148 : The Seven Sisters DANCe. I. Pleiades (Bouy+, 2015)
J/A+A/596/A113 : The Seven Sisters DANCe. II. Pleiades (Barrado+, 2016)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
10- 18 I9 --- EPIC EPIC number
20- 27 F8.5 deg RAdeg Right ascension (J2000.0)
29- 36 F8.5 deg DEdeg Declinaison (J2000.0)
39- 43 F5.2 mag Vmag ?=- V magnitude
45- 49 F5.3 mag J-K (J-K) color index
51- 58 F8.6 d Per Photometric/rotational period
60- 64 F5.3 mag Amp Photometric amplitude
66 A1 --- l_WLi Limit flag on WLi
67- 71 F5.1 0.1pm WLi Average LiI equivalent width
73- 76 F4.1 0.1pm e_WLi ?=- rms error LiI Eq. Width
78- 83 F6.1 K Teff Effective temperature
85- 89 F5.3 [-] ALi LiI abundance
91- 95 F5.3 [-] e_ALi rms error Li abundance
97-105 A9 --- Bin Multiplicity status
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Acknowledgements:
Jerome Bouvier, jerome.bouvier(at)univ-grenoble-alpes.fr
(End) Jerome Bouvier [IPAG], Patricia Vannier [CDS] 02-Feb-2018