J/ApJ/723/1542 Optical high-resolution spectroscopy of WTTSs (Xing, 2010)
Lithium abundances from optical high-resolution spectroscopy of weak-line T Tauri stars. Xing L.F. <Astrophys. J., 723, 1542-1548 (2010)> =2010ApJ...723.1542X
ADC_Keywords: Abundances ; Equivalent widths ; Effective temperatures ; Stars, pre-main sequence ; YSOs Keywords: stars: abundances - stars: evolution - stars: pre-main sequence Abstract: We present high-resolution spectroscopic observations for a sample of 19 weak-line T Tauri stars (WTTSs). Based on these observations and data of 108 WTTSs taken from the literature, we derive lithium abundances for 127 WTTSs. Investigation of a possible relation between lithium and rotation in WTTSs shows that: (1) rapidly rotating WTTSs have comparatively lower lithium abundances than their slower rotating counterparts; (2) in the spectral-type range G0-K0, most of the WTTSs share the same Li content irrespective of their Teff; and (3) active late-type binaries do not obey the correlation between lithium abundances and rotation periods, since the tidally locked rotation of the late-type binary system leads naturally to slower lithium destruction rates. Description: Spectroscopic observations were carried out on nine nights from 2007 December 18 to 20, 2008 January 15 to 17 and 2009 October 6 to 8 with the Coude Echelle Spectrograph and a 1024x1024 Tek CCD attached to the 2.16m telescope at the Xinglong station of the National Astronomical Observatories, Chinese Academy of Science (NAOC). The resolving power was on the order of 37000 and the spectral coverage is 580-880nm. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 65 19 Photometric results and other parameters of our WTTSs sample table2.dat 76 108 Photometric results and other parameters of WTTSs
See also: J/A+A/479/827 : UBVR light curves of weak-line T Tauri stars (Grankin+, 2008) J/A+A/467/785 : SuperWASP/ROSAT periodic variable stars (Norton+, 2007) J/ApJ/667/308 : Weak-line T Tauri in Spitzer c2d Survey. II. (Cieza+, 2007) J/AJ/129/2294 : Radial velocities of WTTS (Massarotti+, 2005) J/A+A/375/130 : New PMS spectroscopic binaries in Orion (Covino+ 2001) J/A+A/372/862 : Lithium abundances in IC 2602 and IC 2391 (Randich+, 2001) J/A+AS/145/187 : uvby-β photometry of WTTS (Chavarria-K+, 2000) J/A+A/341/L79 : Proper motions of faint ROSAT WTT stars (Terranegra+ 1999) J/A+AS/132/173 : New weak-line T Tauri stars in Taurus-Auriga (Li+ 1998) J/A+AS/124/449 : Young stars south of Taurus-Auriga (Magazzu+ 1997) J/A+A/312/439 : New T Tauri stars in Taurus-Auriga (Wichmann+, 1996) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 14 A4 --- SpT MK spectral type (mainly from Li & Hu (1998, Cat. J/A+AS/132/173) 16- 20 F5.3 mag B-V ? The SIMBAD (B-V) color index 22- 25 I4 K Teff1 ? Effective temperature determined from B-V 27- 30 I4 K Teff2 Effective temperature determined from the line-depth ratios of VIλ6251.83 and FeIλ6252.527 32- 35 I4 K Teff ? Effective temperature from literature 36 A1 --- r_Teff Reference for Teff (1) 38- 40 I3 10-13m W(Li) Equivalent width of Li (mÅ) 42- 45 F4.2 [-] logNLi ? Log of the Li number abundance (H=12) 47- 50 F4.2 [cm/s2] log(g) Log of the surface gravity 52- 57 F6.4 d Prot ? Rotational period (mainly derived by Xing et al. (2006ChJAA...6..716X) 59- 61 A3 --- r_Prot Reference for Prot (1) 63- 65 A3 --- Note Note on Name (unexplained bi or Bi?)
Note (1): Reference as follows: M = Teff from Mentuch et al. (2008ApJ...689.1127M). B = Teff from Boesgaard et al. (2003ApJ...582..410B). d = Teff from do Nascimento et al. (2003A&A...405..723D). S = Teff from Santos et al. (2008A&A...480..889S). N = Prot from Norton et al. (2007, Cat. J/A+A/467/785). Y = Prot from Yang & Liu (2002A&A...387..162Y). X07 = Prot from Xing et al. (2007ChJAA...7..551X). X = Prot from Xing et al. (2006ChJAA...6..716X). Ma = Prot from Marilli et al. (2007A&A...463.1081M).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1 I1 --- Type Stellar type and location code (1) 3- 20 A18 --- Name Stellar name (2) 22- 25 A4 --- SpT MK spectral type 27- 32 F6.3 mag Vmag ? V band magnitude 34 A1 --- r_Vmag Reference for Vmag (3) 36- 40 F5.3 mag B-V ? The (B-V) color index 42- 45 I4 K Teff Effective temperature 47 A1 --- r_Teff Reference for Teff (3) 49- 51 I3 10-13m W(Li) Equivalent width of Li (mÅ) 53- 56 F4.2 [-] logNLi ? Log of the Li number abundance 58- 62 F5.3 d Prot ? Rotational period 64- 66 A3 --- r_Prot Reference for Prot (3) 68- 71 F4.2 [cm/s2] log(g) Log of the surface gravity 73- 76 A4 --- Note Note (dou=double star system or mult=multiple)
Note (1): Code as follows: 1 = High-resolution spectroscopy of Li-rich stars in Taurus-Auriga (Wichmann et al. 2000A&A...359..181W). 2 = High-resolution spectroscopy of PMS stars in Orion (Alcala et al. 2000A&A...353..186A). 3 = High-resolution spectroscopy of WTTSs near Lupus (Wichmann et al. 1999MNRAS.307..909W). 4 = Naked T Tauri stars with Taurus-Auriga (Walter et al. 1988AJ.....96..297W). 5 = pre-main sequence spectroscopic binaries in Orion (Covino et al. 2001, Cat. J/A+A/375/130). 6 = (intermediate resolution) Young stars south of Taurus-Auriga (Magazzu et al. 1997, Cat. J/A+AS/124/449). 7 = New weak-line T Tauri stars in Orion (Alcala et al. 1996A&AS..119....7A). Note (2): RX J0329.1+011 is very likely a misprint for RX J0329.1+0118; (corrected by CDS). (RX J0312.8-0414NW and SE are <[MMS97] RX J0312.8-0414NW> and SE in Simbad). Note (3): Reference as follows: W = Teff from Wichmann et al. (2000A&A...359..181W); B = Prot from Broeg et al. (2006A&A...450.1135B); G93 = Prot from Grankin et al. (1993IBVS.3823....1G); W98 = Prot from Wichmann et al. (1998A&A...330..521W); X = Prot from Xing et al. (2006ChJAA...6..716X); M = Prot from Marilli et al. (2007A&A...463.1081M); N = Prot from Norton et al. (2007, Cat. J/A+A/467/785).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-Jul-2012
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