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J/A+A/536/A63   Collinder 69 very low mass stars and brown dwarfs  (Bayo+, 2011)

Spectroscopy of very low mass stars and brown dwarfs in the lambda Orionis star forming region. I. Enlarging the census down to the planetary mass domain in Collinder 69. Bayo A., Barrado D., Stauffer J., Morales-Calderon M., Melo C., Huelamo N., Bouy H., Stelzer B., Tamura M., Jayawardhana R. <Astron. Astrophys. 536, A63 (2011)> =2011A&A...536A..63B
ADC_Keywords: Clusters, open ; Stars, early-type ; Equivalent widths Keywords: brown dwarfs - stars: formation - stars: luminosity function, mass function - infrared: stars - star: low-mass - open clusters and associations: individual: Collinder 69 Abstract: We have studied age dependent features in optical and near-infrared spectra of candidate members to the cluster (such as alkali lines and accretion associated indicators). In addition, we have complemented that study with the analysis of other youth indicators like X-ray emission or mid-infrared excess. We have confirmed the membership to Collinder 69 of ∼90 photometric candidate members. As a byproduct we have determined a temperature scale for young M, very low-mass stars and brown dwarfs. We have assembled one of the most complete Initial Mass Functions from 0.016 to 20M. And, finally, we have studied the implications of the spatial distribution of the confirmed members on the proposed mechanisms of brown dwarfs formation. Description: Spectroscopic measurements and derived parameters for Collinder 69 candidate and confirmed members from this work and compiled from the literature. Some of the parameters provided in the table include spectral types, effective temperatures, masses, etc. along with equivalent widths measurements of several alkali lines. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 187 220 Summary of the parameters derived in this work for Collinder 69 candidate members and comparison with previous studies
See also: J/AJ/118/2409 : VRI photometry of lambda Ori PMS stars (Dolan+, 1999) J/AJ/121/2124 : lambda Ori pre-main-sequence stars photometry (Dolan+, 2001) J/ApJ/610/1064 : lambda Ori substellar population (Barrado y Navascues+ 2004) J/ApJ/664/481 : Collinder 69 opt/IR photometry (Barrado y Navascues+ 2007) J/A+A/488/167 : Low-mass stars in sigma Ori and lambda Ori (Sacco+, 2008) J/A+A/492/277 : Analysis of Collinder 69 stars with VOSA (Bayo+, 2008) J/MNRAS/385/2210 : Spectroscopy around lam Ori and sig Ori (Maxted+, 2008) J/A+A/526/A21 : Collinder 69 X-ray sources (Barrado+, 2011) Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Object name 14- 31 A18 --- ONames Alternative name(s) 33- 40 F8.5 deg RAdeg Right ascension in decimal degrees (J2000) 42- 50 F9.6 deg DEdeg Declination in decimal degrees (J2000) 52- 53 A2 --- Mm Membership (1) 55- 67 A13 --- r_Mm Reference for membership (2) 69- 85 A17 --- SpType MK spectral type(s) 87 A1 --- n_SpType [2/3] Note on SpType (3) 89- 92 I4 K Teff Effective temperature 94- 98 E5.3 Lsun Lbol ? Bolometric luminosity 100-105 E6.4 Lsun e_Lbol ? rms uncertainty on Lbol 107-111 F5.3 Msun Mass ? Mass 113 A1 --- VLi [Y] Y for variable in Li equivalent width 115-121 A7 ---- Inst Instrumental configuration (4) 124-128 F5.3 0.1nm W(Li)a ? Li 6708Å equivalent width from this work 130-134 F5.3 0.1nm e_W(Li)a ? rms uncertainty on W(Li)a 136-139 F4.2 0.1nm W(Li)b ? Li 6708Å equivalent width from Dolan & Mathieu, 1999, Cat. J/AJ/118/2409; 2001, Cat. J/AJ/121/2124 141-145 F5.3 0.1nm W(Li)c ? Li 6708Å equivalent width from Sacco et al., 2008, Cat. J/A+A/488/167 147-151 F5.3 0.1nm e_W(Li)c ? rms uncertainty on W(Li)c 153-157 F5.3 0.1nm W(KI)1 ? KI 7665Å equivalent width 159-163 F5.3 0.1nm e_W(KI)1 ? rms uncertainty on W(KI)1 165-169 F5.3 0.1nm W(KI)2 ? KI 7700Å equivalent width 171-175 F5.3 0.1nm e_W(KI)2 ? rms uncertainty on W(KI)2 177-181 F5.3 0.1nm W(NaI) ? NaI 8200Å equivalent width 183-187 F5.3 0.1nm e_W(NaI) ? rms uncertainty on W(NaI)
Note (1): Membership code as follows: Y = spectroscopically confirmed member Y? = object showing some peculiarity already discussed but still considered as very good candidate for membership NM = non-member Note (2): Membership confirmed by the following: DM = Dolan & Mathieu, 1999, Cat. J/AJ/118/2409; 2001, J/AJ/121/2124 S08 = Sacco et al., 2008, Cat. J/A+A/488/167 M08 = Maxted et al., 2008, Cat. J/MNRAS/385/2210 B10 = This work Note (3): Note on SpType as follows: 2 = Spectral type photometrically determined by Sacco et al., 2008, Cat. J/A+A/488/167 (all the remaining spectral types were obtained spectroscopically in this work) 3 = Infrared spectral type (see paper) Note (4): Instrumental configuration (with resolution) as follows: 1 = LRIS (R≃2650) 2 = LRIS (R≃950) 3 = MIKE (R≃11250) 4 = B&C (R≃2600) 5 = B&C (R≃800) 6 = TWIN (R≃1100) 7 = CAFOS (R≃600) 8 = FLAMES (R≃8600) 9 = NIRSPEC (R≃2000) 10 = SOFI (R≃950) 11 = IRCS (R≃200)
Acknowledgements: Amelia Bayo, abayo(at)eso.org History: * 08-Dec-2011: on-line version * 08-Mar-2013: 1 name corrected
(End) Amelia Bayo [ESO], Patricia Vannier [CDS] 23-Sep-2011
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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