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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
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 175 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) tracks 131 A1 --- --- [,] 133-135 F3.1 solMass DM97-M Mass using D'Antona & Mazzitelli (1997MmSAI..68..807D) tracks 137-138 I2 Myr PS01-A Age using Palla & Stahler (2001ApJ...553..299P) tracks 139 A1 --- --- [,] 141-143 F3.1 solMass PS01-M Mass using Palla & Stahler (2001ApJ...553..299P) tracks 145-146 I2 Myr SDF00-A ? Age using Siess et al. (2000A&A...358..593S) tracks 147 A1 --- --- [,] 149-151 F3.1 solMass SDF00-M Mass using Siess et al. (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) 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) 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) track age 140-142 F3.1 solMass PS01-M Palla & Stahler (2001ApJ...553..299P) track mass 144-146 I3 Myr SDF00-A ? Siess, Dufour, & Forestini (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) 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, 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
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