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J/A+A/492/277   Analysis of Collinder 69 stars with VOSA     (Bayo+, 2008)

VOSA: virtual observatory SED analyzer. An application to the Collinder 69 open cluster. Bayo A., Rodrigo C., Barrado Y Navascues D., Solano E., Gutierrez R., Morales-Calderon M., Allard F. <Astron. Astrophys., 492, 277-287 (2008)> =2008A&A...492..277B
ADC_Keywords: Stars, dwarfs ; Stars, atmospheres ; Associations, stellar ; Effective temperatures ; Isochrones Keywords: astronomical data bases: miscellaneous - stars: formation - stars: circumstellar matter - stars: low-mass, brown dwarfs - stars: Hertzsprung-Russell (HR) and C-M diagrams - Galaxy: open clusters and associations: individual: Collinder 69 Abstract: The physical properties of almost any kind of astronomical object can be derived by fitting synthetic spectra or photometry extracted from theoretical models to observational data. We want to develop an automatic procedure to perform this kind of fitting to a relatively large sample of members of a stellar association and apply this methodology to the case of Collinder 69. We combine the multiwavelength data of our sources and follow a work-flow to derive the physical parameters of the sources. The key step of the work-flow is performed by a new VO-tool, VOSA. All the steps in this process are done in a VO environment. Description: Parameters derived for each individual source of the sample. For some of the sources, we have not been able to interpolate between the isochrones and evolutionary tracks (to infer ages and masses), because of their peculiar location in the HR diagram; we have grouped these sources in four possible categories according to the probable cause for this peculiar location (last column of the table). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 63 167 Parameters derived for each individual source of the sample (167 sources)
See also: J/ApJ/664/481 : Collinder 69 optical/IR photometry (Barrado y Navascues+ 2007) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [LOri] 5- 7 I03 --- LOri Name of the source as in Barrado et al. (2007, Cat. J/ApJ/664/481) 9- 15 A7 --- Model Best fitting model collection 17- 20 I4 K Teff Effective temperature 22- 24 F3.1 [cm/s2] log(g) Surface gravity (log) 26- 29 F4.2 --- Fobs/Ftot Ratio of observed to total flux 31- 37 E7.3 solLum Lbol Bolometric luminosity 39- 45 E7.2 solLum e_Lbol Error in Bolometric Luminosity 47- 50 F4.1 Myr Age ? Estimated Age 52- 57 F6.4 solMass Mass ? Stellar mass 61 A1 --- --- [[] 62 A1 --- Note Peculiar location in HR diagram (1) 63 A1 --- --- []]
Note (1): Categories of peculiarities as follows: [1] = Source with disk [2] = Previous "non-member" candidates according to the photometric properties (see Barrado et al. (2007, Cat. J/ApJ/664/481) for further details) [3] = Degenerated fit due the small number of points to be fitted vs number of free parameters [4] = possible foreground cool source [*] = For a more detailed analysis in LOri167 see Barrado et al. (2007A&A...468L...5B).
Acknowledgements: Amelia Bayo, abayo(at) References: Barrado et al., 2007ApJ...664..481B, Cat. J/ApJ/664/481 Spitzer: Accretion in Low-Mass Stars and Brown Dwarfs in the lambda Orionis Cluster Barrado et al., 2007A&A...468L...5B The young, wide and very low mass visual binary Lambda Orionis 167
(End) Amelia Bayo [LAEFF-CAB, INTA-CSIS], Patricia Vannier [CDS] 27-Nov-2008
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