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J/A+A/508/833       SACY III. Li abundances                   (da Silva+, 2009)

Search for associations containing young stars (SACY). III. Ages and Li abundances. da Silva L., Torres C.A.O., de la Reza R., Quast G.R., Melo C.H.F., Sterzik M.F. <Astron. Astrophys., 508, 833-839 (2009)> =2009A&A...508..833D
ADC_Keywords: Associations, stellar ; Abundances ; Equivalent widths Keywords: stars: abundances - stars: pre-main sequence - stars: late-type - star: evolution Abstract: Our study is a follow-up of the SACY project, an extended high spectral resolution survey of more than two thousand optical counterparts to X-ray sources in the southern hemisphere targeted to search for young nearby association. Nine associations have either been newly identified, or have had their member list revised. Groups belonging to the Sco-Cen-Oph complex are not considered in the present study. These nine associations, with ages of between about 6Myr and 70Myr, form an excellent sample to study the Li depletion in the pre-main sequence (PMS) evolution. In the present paper, we investigate the use of Li abundances as an independent clock to constrain the PMS evolution. Using our measurements of the equivalent widths of the Li resonance line and assuming fixed metallicities and microturbulence, we calculated the LTE Li abundances for 376 members of various young associations. In addition, we considered the effects of their projected stellar rotation. Description: The observations were carried out using the FEROS spectrograph at la Silla, ESO, and the Coude spectrograph of the 1.62m telescope of the Observatorio do Pico dos Dias, LNA, Brazil (see Paper I for details, Torres et al., 2006, Cat. J/A+A/460/695). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tables.dat 61 385 Li abundances determined for all high probability members (tables 3-11 of the paper)
See also: J/A+A/460/695 : Search for Associations Containing Young stars (Torres+, 2006) Byte-by-byte Description of file: tables.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Tab [3/11] Table number for association (1) 4- 18 A15 --- Name Star name 20- 21 I2 h RAh Right ascension (J2000) 23- 24 I2 min RAm Right ascension (J2000) 26- 29 F4.1 s RAs Right ascension (J2000) 31 A1 --- DE- Declination sign (J2000) 32- 33 I2 deg DEd Declination (J2000) 35- 36 I2 arcmin DEm Declination (J2000) 38- 39 I2 arcsec DEs Declination (J2000) 41- 43 I3 0.1pm W(Li) ? Li equivalent width (mÅ) 45- 49 I5 K Teff Effective temperature 51- 55 F5.2 [---] A(Li) ? Li abundance (log[N(Li)/N(H)]+12) 57- 59 I3 km/s vsini ? projected stellar rotational velocity 61 A1 --- Int [I] I for Intruders (Li eliminated stars)
Note (1): Associations as follows: 3 = β Pictoris association 4 = Tucana-Horologium association 5 = Columba association 6 = Carina association 7 = TW Hydrae association 8 = ε Chamaleontis association 9 = Octans association 10 = Argus association 11 = AB Doradus association
History: From electronic version of the journal References: Torres et al., Paper I 2006A&A...460..695T, Cat. J/A+A/460/695 Almeida Viana et al., Paper II 2009A&A...501..965A
(End) Patricia Vannier [CDS] 19-Aug-2011
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