J/AJ/124/1670 Post-T Tauri Stars in Sco-Cen Association (Mamajek+, 2002)
Post-T Tauri Stars in the Nearest OB Association
Mamajek E.E., Meyer M.R., Liebert J.
<Astron. J. 124, 1670 (2002)>
=2002AJ....124.1670M 2002AJ....124.1670M
ADC_Keywords: Associations, stellar ; Stars, OB ; Stars, pre-main sequence ;
Photometry, UBV ; Photometry, infrared ; X-ray sources
Keywords: open clusters and associations: individual
(Scorpius OB2, Lower Centaurus-Crux, Upper Centaurus-Lupus) -
stars: activity - stars: formation - stars: kinematics -
stars: pre-main-sequence - X-rays
Abstract:
We present results of a spectroscopic survey of X-ray and
proper-motion-selected samples of late-type stars in the Lower
Centaurus-Crux (LCC) and Upper Centaurus-Lupus (UCL) subgroups of the
nearest OB association: Scorpius-Centaurus. The primary goals of the
survey are to determine the star formation history of the OB subgroups
and to assess the frequency of accreting stars in a sample dominated
by "post-T Tauri" pre-main-sequence (PMS) stars. We investigate two
samples: (1) proper-motion candidates from the ACT Catalog (I/246)
and Tycho Reference Catalog (TRC, I/250) with X-ray counterparts in
the ROSAT All-Sky Survey (RASS) Bright Source Catalog and (2) G- and
K-type stars in the Hipparcos catalog found to be candidate members by
de Zeeuw et al. (1999, Cat. J/AJ/117/354). We obtained optical
spectra of 130 candidates with the Siding Spring 2.3m dual-beam
spectrograph.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 170 30 Properties of de Zeeuw et al. (1999, Cat.
J/AJ/117/354) Sco-Cen G-K candidate members
table2.dat 149 96 Properties of RASS-ACT/TRC candidates
table3.dat 79 20 Spectral standard stars
table4.dat 179 22 LCC and UCL pre-main-sequence members from
de Zeeuw et al. (1999, J/AJ/117/354) list
table5.dat 183 88 Pre-main sequence LCC & UCL RASS-ACT/TRC members
table6.dat 93 16 RASS-ACT/TRC and HIPPARCOS stars rejected as
Sco-Cen members
notes.dat 70 55 Notes
--------------------------------------------------------------------------------
See also:
I/246 : The ACT Reference Catalog (Urban+ 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/250 : The Tycho Reference Catalogue (Hog+ 1998)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- HIP HIP number
7- 9 A3 --- Group OB group (LCC or UCL)
11- 12 I2 h RAh Right ascension (J2000.0)
14- 15 I2 min RAm Right ascension (J2000.0)
17- 21 F5.2 s RAs Right ascension (J2000.0)
23 A1 --- DE- Declination sign (J2000.0)
24- 25 I2 deg DEd Declination (J2000.0)
27- 28 I2 arcmin DEm Declination (J2000.0)
30- 33 F4.1 arcsec DEs Declination (J2000.0)
35- 39 F5.1 mas/yr pmRA Proper motion in right ascension
41- 43 F3.1 mas/yr e_pmRA rms uncertainty on pmRA
45- 49 F5.1 mas/yr pmDE Proper motion in declination
51- 53 F3.1 mas/yr e_pmDE rms uncertainty on pmDE
55- 59 F5.2 mag Vmag V magnitude
61- 64 F4.2 mag B-V B-V colour index
66- 69 F4.2 mag e_B-V rms uncertainty on B-V
71- 81 A11 --- SpType MK spectral type from MSS
83- 84 A2 --- q_SpType Quality flag (1)
86- 89 F4.2 mag Jmag 2MASS J magnitude
91- 94 F4.2 mag e_Jmag rms uncertainty on Jmag
96- 99 F4.2 mag Hmag 2MASS H magnitude
101-104 F4.2 mag e_Hmag rms uncertainty on Hmag
106-109 F4.2 mag Ksmag 2MASS Ks magnitude
111-114 F4.2 mag e_Ksmag rms uncertainty on Ksmag
116-175 A60 --- Notes Notes on variability, X-ray counterparts,
and multiple star system name (CCDM) from
Hipparcos. (2)
--------------------------------------------------------------------------------
Note (1): Quality flag:
q1: quality = 1 in the Michigan Spectral Survey (MSS, Vols. 1-3) catalog.
Note (2): "Var.(N.NN)" indicates that the H6 field in the Hipparcos
catalog is identified as being variable in the broad Hp passband. The
magnitude scatter N.NN in Hp is listed, and period P if found. Near-IR
photometry is from the preliminary 2MASS database. The name is given
of RASS BSC X-ray sources within 40" of Hipparcos stars; many of the
variable stars are also ROSAT sources. Astrometric data and optical
photometry are from from the Hipparcos catalog (Cat. I/239).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- TYC The Tycho-2 name
13- 15 A3 --- Group The OB subgroup
17- 18 I2 h RAh Hour of Right Ascension (J2000) from the TYC
20- 21 I2 min RAm Minute of Right Ascension (J2000) from the TYC
23- 27 F5.2 s RAs Second of Right Ascension (J2000) from the TYC
29 A1 --- DE- Sign of the Declination (J2000) from the TYC
30- 31 I2 deg DEd Degree of Declination (J2000) from the TYC
33- 34 I2 arcmin DEm Arcminute of Declination (J2000) from the TYC
36- 39 F4.1 arcsec DEs Arcsecond of Declination (J2000) from the TYC
41- 45 F5.1 mas/yr pmRA Proper motion in Right Ascension (1)
47- 49 F3.1 mas/yr e_pmRA Error in pmRA
51- 55 F5.1 mas/yr pmDE Proper motion in Declination
57- 59 F3.1 mas/yr e_pmDE Error in pmDE
61- 65 F5.2 mag Vmag The VT band magnitude
67- 70 F4.2 mag e_Vmag Error in Vmag
72- 75 F4.2 mag B-V The (BT - VT) band color
77- 80 F4.2 mag e_B-V Error in B-V
82- 85 F4.2 mag Jmag The 2MASS J band magnitude
87- 90 F4.2 mag e_Jmag Error in Jmag
92- 95 F4.2 mag Hmag The 2MASS H band magnitude
97-100 F4.2 mag e_Hmag Error in Hmag
102-105 F4.2 mag Ksmag The 2MASS Ks band magnitude
107-110 F4.2 mag e_Ksmag Error in Ksmag
112-127 A16 --- 1RXS The X-ray counterpart name in RASS-BSC
129-130 I2 arcsec Sep The optical - X-ray separation
132-139 E8.3 ct/s Xcts The X-ray counts
141-145 F5.2 --- HR1 The Hardness ratio
147-148 I2 --- MML ? Number in table5.dat if "pre-MS" or
"pre-MS?" in nature
--------------------------------------------------------------------------------
Note (1): Where pmRA is the proper motion along the Right Ascension
times the cosine of the Declination.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD number
9- 12 I4 --- HR ? HR number
14- 22 A9 --- MKSpType MK spectral type
24- 27 F4.2 mag Vmag V magnitude
29- 33 F5.1 mas plx Trigonometric Parallax
35- 37 F3.1 mas e_plx rms uncertainty on plx
39- 42 F4.2 mag B-V B-V colour index
44- 47 F4.1 Sun [Fe/H] ? Adopted metallicity (1)
48 A1 --- u_[Fe/H] A semicolon indicates considerable scatter
(>0.2dex) in the published estimates
50- 60 A11 --- MSSpType MK spectral type from MSS (2)
61- 69 A9 --- SpType Adopted MK spectral type
71- 73 A3 --- Note Individual notes, see file "notes.dat"
--------------------------------------------------------------------------------
Note (1): The [Fe/H] estimate is adopted from the compilation of published
values in Cayrel de Strobel et al., 2001, Cat. III/221
Note (2): MSS: Michigan Spectral Survey, Vols. 1-5
(Houk & Cowley 1975, III/31; Houk 1978, III/51, 1982, III/80;
Houk & Smith-Moore 1988 III/133; Houk & Swift 1999, III/214).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- HIP HIP number
7- 9 A3 --- Group OB group (LCC or UCL)
11- 12 I2 h RAh Right ascension (J2000.0)
14- 15 I2 min RAm Right ascension (J2000.0)
17- 21 F5.2 s RAs Right ascension (J2000.0)
23 A1 --- DE- Declination sign (J2000.0)
24- 25 I2 deg DEd Declination (J2000.0)
27- 28 I2 arcmin DEm Declination (J2000.0)
30- 33 F4.1 arcsec DEs Declination (J2000.0)
35- 39 F5.2 mas plx HIP trigonometric parallax
41- 44 F4.2 mas e_plx rms uncertainty on plx
46- 50 F5.2 mas plxkin Kinematic parallax
52- 55 F4.2 mas e_plxkin rms uncertainty on plxkin
57- 59 I3 % P1 Membership probability with vdisp=1km/s
61- 63 I3 % P3 Membership probability with vdisp=3km/s
65- 72 A8 --- SpType MK spectral type
74- 78 F5.3 [K] logTeff Effective temperature
80- 84 F5.3 [K] e_logTeff rms uncertainty on logTeff
86- 89 F4.2 [solLum] logL Luminosity
91- 94 F4.2 [solLum] e_logL rms uncertainty on logL
96-100 F5.2 mag AV Extinction in V band
102-105 F4.2 mag e_AV rms uncertainty on AV
107-110 F4.1 0.1nm EW(Ha) Hα λ6562.8 equivalent width
112-115 F4.2 0.1nm EW(Li) Li λ6707.8 equivalent width
117 A1 --- l_logLX Limit flag on logLX
118-121 F4.1 [10-7W] logLX X-ray luminosity (G1)
123 A1 --- l_log(LX/Lbol) Limit flag on log(LX/Lbol)
124-127 F4.1 --- log(LX/Lbol) logarithm of ratio between X-ray and
bolometric luminosities
129-130 I2 Myr DM97-A ? Age using D'Antona & Mazzitelli
(1997MmSAI..68..807D 1997MmSAI..68..807D) tracks
131 A1 --- --- [,]
133-135 F3.1 solMass DM97-M Mass using D'Antona & Mazzitelli
(1997MmSAI..68..807D 1997MmSAI..68..807D) tracks
137-138 I2 Myr PS01-A Age using Palla & Stahler
(2001ApJ...553..299P 2001ApJ...553..299P) tracks
139 A1 --- --- [,]
141-143 F3.1 solMass PS01-M Mass using Palla & Stahler
(2001ApJ...553..299P 2001ApJ...553..299P) tracks
145-146 I2 Myr SDF00-A ? Age using Siess et al.
(2000A&A...358..593S 2000A&A...358..593S) tracks
147 A1 --- --- [,]
149-151 F3.1 solMass SDF00-M Mass using Siess et al.
(2000A&A...358..593S 2000A&A...358..593S) tracks
153-156 A4 --- PMS Classification (2)
158 A1 --- Note [g-l] Individual notes, see "notes.dat"
160-179 A20 --- Rem Remarks (SB: spectroscopic binary)
--------------------------------------------------------------------------------
Note (2): PMS: pre-main sequence; PMS?: probably premain sequence
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- MML [1/88] Short Identification number
4- 14 A11 --- TYC The Tycho-2 name
16- 18 A3 --- Group The OB subgroup (LCC or UCL)
20- 21 I2 h RAh Hour of Right Ascension (J2000) from the TYC
23- 24 I2 min RAm Minute of Right Ascension (J2000) the TYC
26- 30 F5.2 s RAs Second of Right Ascension (J2000) the TYC
32 A1 --- DE- Sign of the Declination (J2000) the TYC
33- 34 I2 deg DEd Degree of Declination (J2000) the TYC
36- 37 I2 arcmin DEm Arcminute of Declination (J2000) the TYC
39- 42 F4.1 arcsec DEs Arcsecond of Declination (J2000) the TYC
44- 48 F5.2 mas plx Kinematic parallax estimate (1)
50- 53 F4.2 mas e_plx Error in plx
55- 57 I3 % P1 Membership probability with vdisp=1km/s
59- 61 I3 % P3 Membership probability with vdisp=3km/s
63- 69 A7 --- SpType MK Spectral Type (2)
71- 75 F5.3 [K] logTeff Log of the effective temperature
77- 81 F5.3 [K] e_logTeff Error in logT
83- 87 F5.2 [solLum] logL Log of the Luminosity (3)
89- 92 F4.2 [solLum] e_logL Error in logL
94- 98 F5.2 mag AV The visual extinction (4)
100-103 F4.2 mag e_AV Error in AV
105-109 F5.1 0.1nm EWHa Equivalent width of Hα (5)
111-114 F4.2 0.1nm EWLi Corrected equivalent width of Li I
(6707.8Å) in Angstroms (6)
116-119 F4.1 [10-7W] logLX Log of the X-ray luminosity in erg/s (G1)
121-124 F4.1 [-] LX/L Log of the X-ray to bolometric luminosity
ratio
126-127 I2 Myr DM97-A ? D'Antona & Mazzitelli (1997MmSAI..68..807D 1997MmSAI..68..807D)
track age
129 A1 --- f_DM97-A [N] Indicates DM97-A is not applicable
131-133 F3.1 solMass DM97-M ? D'Antona & Mazzitelli (1997MmSAI..68..807D 1997MmSAI..68..807D)
track mass
135 A1 --- f_DM97-M [N] Indicates DM97-M is not applicable
137-138 I2 Myr PS01-A Palla & Stahler (2001ApJ...553..299P 2001ApJ...553..299P)
track age
140-142 F3.1 solMass PS01-M Palla & Stahler (2001ApJ...553..299P 2001ApJ...553..299P)
track mass
144-146 I3 Myr SDF00-A ? Siess, Dufour, & Forestini
(2000A&A...358..593S 2000A&A...358..593S) track age (8)
148 A1 --- f_SDF00-A [N] Indicates SDF00-A is not applicable
150-152 F3.1 solMass SDF00-M Siess, Dufour, & Forestini
(2000A&A...358..593S 2000A&A...358..593S) track mass (8)
155-158 A4 --- PMS Classification (9)
160-175 A16 --- Name Other name
177-179 A3 --- Type Type (10)
181-183 A3 --- Note [m-x, ] Additional notes, see "notes.dat"
--------------------------------------------------------------------------------
Note (1): See section 6.3.
Note (2): See section 4.1.
Note (3): See section 6.4.
Note (4): See section 6.4.
Note (5): See section 4.2.1.
Note (6): See section 4.2.2.
Note (8): Siess, Dufour, & Forestini, 2000A&A...358..593S 2000A&A...358..593S,
Grids of evolutionary models (2000) at
http://www-laog.obs.ujf-grenoble.fr/activites/starevol/
Note (9): Classification:
PMS = pre-main sequence
PMS? = pre-main sequence? (see section 5.1)
Note (10): Type:
SB = spectroscopic binary
EB = eclipsing binary
CTT = Classical T Tauri star
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name HIP or TYC name
16 A1 --- n_Name [a] Note on Name (1)
18- 19 I2 h RAh Right ascension (J2000.0)
21- 22 I2 min RAm Right ascension (J2000.0)
24- 28 F5.2 s RAs Right ascension (J2000.0)
30 A1 --- DE- Declination sign (J2000.0)
31- 32 I2 deg DEd Declination (J2000.0)
34- 35 I2 arcmin DEm Declination (J2000.0)
37- 40 F4.1 arcsec DEs Declination (J2000.0)
42- 43 I2 % P1 Membership probability (with vdisp=1km/s)
45- 47 I3 % P3 Membership probability (with vdisp=3km/s)
49- 56 A8 --- SpType MK spectral type
58- 60 F3.1 0.1nm EW(Ha) Hα λ6562.8 equivalent width
62- 65 F4.2 0.1nm EW(Li) Corrected Li λ6707.8 equivalent width
67 A1 --- l_log(LX/Lbol) Limit flag on log(LX/Lbol)
68- 71 F4.1 [---] log(LX/Lbol) logarithm of ratio between X-ray and
bolometric luminosities (G1)
73- 93 A21 --- Type Type of star
--------------------------------------------------------------------------------
Note (1): a: HD 116402. Cutispoto et al. (2002, Cat. J/A+A/384/491
measure EW(Li)=220mÅ and vsini=35km/s
--------------------------------------------------------------------------------
Byte-by-byte Description of file: notes.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Note [a-x] Note number
2 A1 --- --- [:]
4- 70 A67 --- Text Text of note
--------------------------------------------------------------------------------
Global notes:
Note (G1): Approximate upper limits assume RASS PSPC detection limit
of 0.05ct/s and HR1=0.
--------------------------------------------------------------------------------
History:
* 19-Nov-2002: Corrected in table3 HD number of HR 7061
(173667 instead of 173677)
Acknowledgements: Eric Mamajek
(End) Patricia Bauer [CDS] 10-Jul-2002