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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 91 119 Activity index, rotation, Li abundance, age, and the atmospheric parameters
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
Bytes Format Units Label Explanations
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
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).
History: From electronic version of the journal References: Takeda et al., Paper I 2007A&A...468..663T, Cat. J/A+A/468/663
(End) Patricia Vannier [CDS] 16-Sep-2010
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