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Activity and the Li abundances in the FGK dwarfs
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2012, 547, pp.id.A106. ⟨10.1051/0004-6361/201118412⟩, ASTRONOMY & ASTROPHYSICS
- Publication Year :
- 2012
- Publisher :
- EDP Sciences, 2012.
-
Abstract
- The aim of the present study is to determine the Li abundances for a large set of the FGK dwarfs and to analyse the connections between the Li content, stellar parameters, and activity. Atmospheric parameters, rotational velocities and Li abundances were determined from a homogeneous collection of the echelle spectra with high resolution and high signal-to-noise ratio. Rotational velocities vsini were determined by calibrating the cross-correlation function. Effective temperatures Teff were estimated by the line-depth ratio method. Surface gravities log g were computed by two methods: iron ionization balance and parallax. LTE Li abundances were computed using the synthetic spectrum method. The behaviour of the Li abundance was examined in correlation with Teff, [Fe/H], vsini and level of activity in three stellar groups of different temperatures. The stellar parameters and Li abundances are presented for 150 slow rotating stars of the lower part of MS. The studied stars show a decline in the Li abundance with decreasing temperature Teff and a significant spread, which should be due to the differences of age. A correlation between Li abundance, vsini and level of chromospheric activity is seen for stars with 6000>Teff>5700 K, and it is tighter for stars with 5700>Teff>5200 K. Stars with Teff<br />8 pages, accepted in A&A
- Subjects :
- Physics
010504 meteorology & atmospheric sciences
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Synthetic spectrum
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Atmospheric temperature range
[PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
01 natural sciences
Spectral line
Stars
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
Homogeneous
Abundance (ecology)
Ionization
0103 physical sciences
Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Dynamo
Subjects
Details
- ISSN :
- 14320746 and 00046361
- Volume :
- 547
- Database :
- OpenAIRE
- Journal :
- Astronomy & Astrophysics
- Accession number :
- edsair.doi.dedup.....9e5704a5506801d5f5d7f2f4c62c6b9d