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J/ApJ/688/377       Low-mass objects in Upper Scorpius. II.  (Slesnick+, 2008)

A large-area search for low-mass objects in Upper Scorpius. II. Age and mass distributions. Slesnick C.L., Hillenbrand L.A., Carpenter J.M. <Astrophys. J., 688, 377-397 (2008)> =2008ApJ...688..377S
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, SDSS ; Photometry, infrared ; Equivalent widths Keywords: open clusters and associations: individual (Upper Scorpius) - stars: fundamental parameters - stars: low-mass, brown dwarfs - stars: luminosity function, mass function - stars: pre-main sequence Abstract: We present continued results from a wide-field, ∼150°2, optical photometric and spectroscopic survey of the northern part of the ∼5Myr old Upper Scorpius OB association. Photometry and spectral types were used to derive effective temperatures and luminosities and place newly identified association members onto a theoretical Hertzsprung-Russell diagram. From our survey, we have discovered 145 new low-mass members of the association and determined ∼10% of these objects to be actively accreting material from a surrounding circumstellar disk. Description: Drift-scan observations were taken with the Quest-2 camera on the 48 inch (1.2m) Samuel Oschin Schmidt Telescope at Palomar Observatory. Details of the observations and data analysis are given in Paper I, Slesnick et al. (2006, Cat. J/AJ/131/3016), and Slesnick (2007, Ph.D. thesis, Caltech). Moderate-resolution spectra of 105 PMS star candidates were taken with the Double Spectrograph on the Palomar 200 inch (5.08m) telescope during the nights of 2006 May 16-19 and June 1-2. Additional spectra of PMS star candidates in USco were taken at CTIO using the Hydra multifiber spectrograph on the Blanco 4m telescope during the nights of 2005 July 24-28. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 128 145 Measured quantities for new PMS stars in USco table2.dat 43 145 Derived quantities for new USco members table3.dat 58 98 Measured quantities for spectroscopically confirmed field dwarfs
See also: J/AJ/131/3016 : Low-mass objects in Upper Scorpius (Slesnick+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [SCH] 5- 22 A18 --- [SCH2006] Name (JHHMMSSss+DDMMSSss) 23- 25 A3 --- n_[SCH2006] [e,f ] Note on [SCH2006] (1) 27- 31 F5.2 mag gmag ?=- g magnitude 33- 37 F5.2 mag rmag ?=- r magnitude 39- 43 F5.2 mag imag ?=- i magnitude 45- 49 F5.2 mag Jmag 2MASS J magnitude 51- 55 F5.2 mag Hmag 2MASS H magnitude 57- 61 F5.2 mag Ksmag 2MASS Ks magnitude 63- 66 F4.2 --- TiO1 ?=- Strength of TiO λ7140 absorption compared to a continuum band at 7035Å 68- 71 F4.2 --- TiO2 ?=- Strength of TiO λ8465 absorption compared to a continuum band at 8415Å 73- 76 F4.2 --- Na1 ?=- Strength of the NaI doublet at 8189Å compared to a continuum band at 8150Å 78- 82 A5 --- SpT MK spectral type (2) 84- 89 F6.1 0.1nm EWHa Hα equivalent width 91-121 A31 --- Name2 Other name 124-127 A4 --- SpT2 Other MK spectral type associated to Name2 128 A1 --- r_SpT2 [dghij] Reference to Name2 and SpT2 (3)
Note (1): Notes as follows: e = Two targets observed during the first spectroscopic observing run before the final photometric calibrations were finished do not have calibrated r, i magnitudes. f = Star identified as a member of USco in Paper I, J/AJ/131/3016 Note (2): Spectral type errors are ±0.5 for M subclasses. Note (3): References as follows: d = Martin et al. (2004AJ....127..449M) g = Ardila et al. (2000, Cat. J/AJ/120/479) h = Preibisch et al. (2002, Cat. J/AJ/124/404) i = Barsony et al. (1997, Cat. J/ApJS/112/109) j = Wilking et al. (1987AJ.....94..106W)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [SCH] 5- 22 A18 --- [SCH2006] Name (JHHMMSSss+DDMMSSss) 24- 27 F4.2 [K] logTe Effective temperature 29- 33 F5.2 [solLum] logL Luminosity 35- 38 F4.2 [yr] logAge ?=- Age (1) 40- 43 F4.2 solMass Mass Mass (1)
Note (1): Masses and ages derived from the model tracks and isochrones of D'Antona & Mazzitelli (1997MmSAI..68..807D).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [SCH] 5- 22 A18 --- [SCH2006] Name (JHHMMSSss+DDMMSSss) 24- 28 F5.2 mag gmag ?=- g magnitude 30- 34 F5.2 mag rmag r magnitude 36- 40 F5.2 mag imag i magnitude 42- 46 F5.2 mag Jmag 2MASS J magnitude 48- 52 F5.2 mag Hmag 2MASS H magnitude 54- 58 F5.2 mag Ksmag 2MASS Ks magnitude
History: From electronic version of the journal References: Slesnick et al., Paper I 2006AJ....131.3016S (Cat. J/AJ/131/3016)
(End) Patricia Vannier [CDS] 16-Nov-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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