J/A+A/515/A93 Li abundances in solar-analog stars. II. (Takeda+, 2010)
Behavior of Li abundances in solar-analog stars.
II. Evidence of the connection with rotation and stellar activity.
Takeda Y., Honda S., Kawanomoto S., Ando H., Sakurai T.
<Astron. Astrophys., 515, A93-93 (2010)>
=2010A&A...515A..93T 2010A&A...515A..93T
ADC_Keywords: Stars, late-type ; Stars, G-type ; Stars, nearby ; Abundances ;
Effective temperatures
Keywords: stars: abundances - stars: activity - stars: atmospheres -
stars: solar-type - stars: rotation
Abstract:
We previously attempted to ascertain why the LiI 6708 line-strengths
of Sun-like stars differ so significantly despite the superficial
similarities of stellar parameters. We carried out a comprehensive
analysis of 118 solar analogs and reported that a close connection
exists between the Li abundance (ALi) and the line-broadening width
(vr+m) mainly contributed by rotational effect), which led us to
conclude that stellar rotation may be the primary control of the
surface Li content.
To examine our claim in more detail, we study whether the degree of
stellar activity exhibits a similar correlation with the Li abundance,
which is expected because of the widely believed close connection
between rotation and activity.
Description:
To acquire data for studying stellar activities from Ca II near-IR
triplet, the observations of 118 solar-analog stars (the same sample
as in Paper I, Cat. J/A+A/468/663) were carried out in five different
months (2007 February and April; 2008 May, August, and December) by
using the HIgh-Dispersion Echelle Spectrograph (HIDES; Izumiura 1999)
at the coude focus of the 188cm reflector of Okayama Astrophysical
Observatory (OAO).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 91 119 Activity index, rotation, Li abundance, age,
and the atmospheric parameters
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/AJ/105/2299 : Li abundance of solar-type stars. II. (Soderblom+, 1993)
J/A+A/371/943 : Lithium abundances for 185 main-sequence stars (Chen+, 2001)
J/A+A/409/251 : Li abundances and velocities in F and G stars (Mallik+, 2003)
J/MNRAS/349/757 : Masses, ages and metallicities of F-G dwarfs (Lambert+, 2004)
J/PASJ/57/45 : Lithium abundances of F-K stars (Takeda+, 2005)
J/A+A/468/663 : Li abundances in solar-analog stars (Takeda+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number (0 for Sun/Moon)
8- 12 F5.3 --- r0(8542) Residual flux at the line center of the
CaII 8542 line
14- 18 F5.2 km/s vsini Projected rotational velocity calibrated in
this study (cf. Sect. 3)
20 A1 --- l_ALi Limit flag on ALi
21- 24 F4.2 [-] ALi Non-LTE lithium abundance (derived in Sect.
4.3 of Paper I and expressed in the usual
normalization of AH=12.00)
25 A1 --- u_ALi [)] Uncertainty flag on ALi
27- 31 F5.2 [yr] logAge logarithm of the stellar age evaluated from
the evolutionary tracks (logAgetrk
defined in Sect. 3.3 of Paper I)
33- 38 F6.1 K dTeff ?=- Effective temperature
star-Sun difference (1)
40- 44 F5.2 [cm/s2] dlogg ?=- Surface gravity star-Sun difference (1)
46- 50 F5.2 km/s dVt ?=- Microturbulence velocity
star-Sun difference (1)
52- 57 F6.3 [-] d[Fe/H] ?=- Metallicity star-Sun difference (1)
59- 68 A10 "YYYY-MM-DD" Date Observational date of each OAO spectrum,
which we used for the measurement
of r0(8542)
70- 91 A22 --- Rem Remarks
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Note (1): Star-Sun differences which were established precisely in Paper I
(J/A+A/468/663) by using the complete differential analysis
(cf. Sect. 3.1.2 therein).
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History:
From electronic version of the journal
References:
Takeda et al., Paper I 2007A&A...468..663T 2007A&A...468..663T, Cat. J/A+A/468/663
(End) Patricia Vannier [CDS] 16-Sep-2010