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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