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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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 2006ChJAA...6..716X)
59- 61 A3 --- r_Prot Reference for Prot (1)
63- 65 A3 --- Note Note on Name (unexplained bi or Bi?)
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Note (1): Reference as follows:
M = Teff from Mentuch et al. (2008ApJ...689.1127M 2008ApJ...689.1127M).
B = Teff from Boesgaard et al. (2003ApJ...582..410B 2003ApJ...582..410B).
d = Teff from do Nascimento et al. (2003A&A...405..723D 2003A&A...405..723D).
S = Teff from Santos et al. (2008A&A...480..889S 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 2002A&A...387..162Y).
X07 = Prot from Xing et al. (2007ChJAA...7..551X 2007ChJAA...7..551X).
X = Prot from Xing et al. (2006ChJAA...6..716X 2006ChJAA...6..716X).
Ma = Prot from Marilli et al. (2007A&A...463.1081M 2007A&A...463.1081M).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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Note (1): Code as follows:
1 = High-resolution spectroscopy of Li-rich stars in Taurus-Auriga
(Wichmann et al. 2000A&A...359..181W 2000A&A...359..181W).
2 = High-resolution spectroscopy of PMS stars in Orion (Alcala et al.
2000A&A...353..186A 2000A&A...353..186A).
3 = High-resolution spectroscopy of WTTSs near Lupus (Wichmann et al.
1999MNRAS.307..909W 1999MNRAS.307..909W).
4 = Naked T Tauri stars with Taurus-Auriga (Walter et al.
1988AJ.....96..297W 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 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 2000A&A...359..181W);
B = Prot from Broeg et al. (2006A&A...450.1135B 2006A&A...450.1135B);
G93 = Prot from Grankin et al. (1993IBVS.3823....1G 1993IBVS.3823....1G);
W98 = Prot from Wichmann et al. (1998A&A...330..521W 1998A&A...330..521W);
X = Prot from Xing et al. (2006ChJAA...6..716X 2006ChJAA...6..716X);
M = Prot from Marilli et al. (2007A&A...463.1081M 2007A&A...463.1081M);
N = Prot from Norton et al. (2007, Cat. J/A+A/467/785).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-Jul-2012