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II/346 JMMC Stellar Diameters Catalogue - JSDC. Version 2 (Bourges+, 2017)
The following files can be converted to FITS (extension .fit or fit.gz)
jsdc_v2.dat jsdc_dis.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=II/346
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Beginning of ReadMe :II/346 JMMC Stellar Diameters Catalogue - JSDC. Version 2 (Bourges+, 2017)
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An all-sky catalogue of computed star diameters.
Bourges L., Mella G., Lafrasse S., Duvert G., Chelli A., Le Bouquin J.-B.,
Delfosse X., Chesneau O.
<ASP Conference Series, Vol. 485, p.223 (2014)>
=2014ASPC..485..223B
=2017yCat.2346....0B
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ADC_Keywords: Stars, standard ; Interferometry ; Fundamental catalog ;
Photometry, infrared ; Parallaxes, trigonometric; Stars, diameters
Keywords: stars: fundamental parameters - techniques: data analysis -
techniques: interferometric - astronomical database: miscellaneous -
catalogs
Abstract:
This catalogue contains stellar angular diameter estimates for nearly
all the stars of the Hipparcos and Tycho catalogue that have an
associated spectral type in Simbad/CDS. The median error on the
diameters is around 1.5%, with possible biases of around 2%. For each
object, the limb-darkened diameter retained is the mean value of
several estimates performed using different couples of photometries.
The chi-square representing the dispersion between these values is
also given (it is below 2 for 400000 stars). An additional flag
signals stars that could represent a risk if chosen as calibrators for
Optical Long-Baseline Interferometry, independently of the correctness
of their apparent diameter estimate.
This catalog replaces the catalog II/300/jsdc .
Description:
The JMMC (Jean-Marie Mariotti Center) Calibrator Workgroup has long
developed methods to estimate the angular diameter of stars, and
provides this expertise in the SearchCal tool
(http://www.jmmc.fr/searchcal). SearchCal creates a dynamical
catalogue of stars suitable to calibrate Optical Long-Baseline
Interferometry (OLBI) observations from on-line queries of CDS
catalogues, according to observational parameters. In essence,
SearchCal is limited only by the completeness of the stellar
catalogues it uses, and in particular is not limited in magnitude.
SearchCal being an application centered on the somewhat restricted
OLBI observational purposes, it appeared useful to make our angular
diameter estimates available for other purposes through a CDS-based
catalog, the JMMC Stellar Diameters Catalogue (JSDC, II/300).
This second version of the catalog represents a tenfold improvement
both in terms of the number of objects and on the precision of the
estimates. This is due to a new algorithm using reddening-free
quantities -- the pseudomagnitudes, allied to a new database of all the
measured stellar angular diameters -- the JMDC (II/345/jmdc), and a
rigorous error propagation at all steps of the processing. All this is
described in the associated publication by Chelli et al.
(2016A&A...589A.112C).
The catalog reports the Limb-Darkened Diameter (LDD) and error for
465877 stars, as well as their BVRIJHKLMN magnitudes, Uniform Disk
Diameters (UDD) in these same photometric bands, Spectral Type, and
two supplementary quality indicators:
- the mean-diameter chi-square (see Appendix A.2 of Chelli et al.,
2016A&A...589A.112C).
- a flag indicating some degree of caution in choosing this star as an
OLBI calibrator: known spectroscopic binaries, Algol type stars, etc,
see Note (1).
The conversion from LDD to UDD in each spectral band is made using
mainly the coefficients from J/A+A/556/A86/table16 and
J/A+A/554/A98/table16 when possible (compatible spectral types) and
following the prescriptions of the JMMC report at
http://www.mariotti.fr/doc/approved/JMMC-MEM-2610-0001.pdf in all
other cases. The errors on UDD values are omitted as they are similar
to the LDD error.
Instead of using this catalog to find a suitable OLBI calibrator, the
reader is invited to use the SearchCal tool at JMMC
(http://www.jmmc.fr/searchcal) which permits a refined search, give
access to other possible calibrators (faint stars not in the Tycho
catalog) and benefits from the maintainance of JMMC and CDS databases.
This catalog replaces the previous JSDC (II/300/jsdc). Almost all
stars in II/300/jsdc are found in II/346 with a consistent diameter,
with the exception of 1935 stars whose estimated diameter differs from
more than 2 sigmas between the two catalogs. The associated file
JSDC_v2_v1_dis.vot (jsdc_dis.dat) summarizes this
difference.