(r2) JMMCSearchCalCDSCatalogReadme < Jmmc/VltiSchool2010

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---+ JMMC Stellar Diameter Catalog

---++ Status
This catalog has been prepared since the beginning of the year and is going to be 
published at CDS soon. %BR%
As it is not public yet, its content is subject to change. 
Please subscribe to the JMMC RSS feed to be notified of the official release.

---++ Description

<verbatim>
================================================================================
JSDC       JMMC Stellar Diameter Catalog
Lafrasse S., Mella G., Bonneau D., Duvert G. & Chelli A., 2010
================================================================================
ADC_Keywords: Stars, standard ; Interferometry ; Fundamental catalog ;
Photometry, infrared ; Parallaxes, trigonometric; Stars, diameters
Keywords: catalogs - stars: fundamental parameters -
instrumentation: interferometers - techniques: interferometric

Abstract:
This catalog contains stellar angular diameter estimate for bright stars,
complete for all stars with Hipparcos parallaxes.

The JMMC Calibrator Workgroup has long developed methods to estimate the angular
diameter of stars, and provides this expertise in the SearchCal software
(http://www.jmmc.fr/searchcal). "SearchCal" creates a dynamical catalog
of stars suitable to calibrate Optical Long-Baseline Interferometry (OLBI)
observations from on-line queries of CDS catalogs, 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 OLBI peculiar purposes, it appeared
useful to publish the estimated angular diameters of all stars with known
parallaxes in a static catalog.

The present catalog of stellar angular diameters has been obtained from an
automated SearchCal results aggregation on the whole celestial sphere. For each
star, the value of the limb-darkened angular diameters are computed using a
surface brightness method and calibrations for (B-V), (V-R) and (V-K) color
indexes.
Stars whose angular diameters estimated from the various color indexes are not
comparable, are rejected, and a reliable error on the estimated diameter is
computed (1). For details of the method see Bonneau et al. (2006). To avoid specific
confusion problems, spectroscopic binaries in the 9th Catalogue of
Spectroscopic Binary Orbits (Pourbaix et al.2009) or close visual binaries with
a separation of less than 2 arc seconds in the Washington Visual Double Star
Catalog (Mason et al. 2001+) have been filtered out.

Description:
Limb Darkened and Uniform Angular diameters are given for 38742 stars, extracted
from the All-sky Compiled Catalogue of 2.5 million stars (I/280B/ascc,
Kharchenko et al. 2009). The limb darkened diameters are computed using the V
magnitude and the (V-K) color index.
The uniform disk diameters are computed for the photometric bands (B, V, R, I,
J, H, K) using the linear limb darkened coefficients from (Claret &
Diaz-Cordoves 1995).
For each star, HD and Hipparcos catalog numbers, equatorial coordinates,
parallax, spectral type, photometric data (B,V,R,J,H,K) and angular diameters
are given.

References:
  Bonneau, D., Clausse, J.M., Delfosse, X. et al, 2006, A&A 456, 789
  Claret, A.; Diaz-Cordoves, J.; Gimenez, A.,1995, A&A Sup. Ser., 114, 247
  Kharchenko, N. V.; Roeser, S., 2009, All-sky Compiled Catalogue of 2.5 million
    stars, VizieR On-line Data Catalog: I/280B. Originally published in:
    2001KFNT...17e.409K
  Mason B.D., Wycoff G.L., Hartkopf W.I., Douglass G.G., Worley C.E. Astron. J.,
    2001, 122, 3466
  Pourbaix D., Tokovinin A.A, Batten A.H., et al., 2004, A&A 424, 272

File Summary:
FileName      Lrecl  Records   Explanations
ReadMe           xx        .   This file
JSDC.dat        yyy      zzz   Star diameters catalog

See also:
J/A+A/393/183 : Catalogue of calibrator stars for LBSI (Borde+, 2002)
J/A+A/433/1155 : 948 bright calibrator stars for interferometry (Merand+, 2005)
B/wds (WDS)The Washington Visual Double Star Catalog (Mason+ 2001-2010)
B/sb9 (SB9)SB9: 9th Catalogue of Spectroscopic Binary Orbits
  (Pourbaix+2004-2009)

Byte-by-byte Description of file: JSDC.dat
  Bytes  Format  Units  Label        Explanations
    1-9      A9  ---    ---          Name: "HIP"+HIP number (Cat. I/280B) or
                                         "TYC"+tycho number (Cat. I/259/tyc2)
  10-11      I2  h      RAh          Right Ascension J2000 (hours)
     12                              ASCII space
  13-14      I2  min    RAm          Right Ascension J2000 (minutes)
     15                              ASCII space
  16-21    F6.3  s      RAs          Right Ascension J2000 (seconds)
     22      A1  ---    DE-          Declination J2000 (sign)
  23-24      I2  deg    DEd          Declination J2000 (degrees)
     25                              ASCII space
  26-27      I2  arcmi  DEm          Declination J2000 (minutes)
     28                              ASCII space
  29-33    F5.2  arcse  DEs          Declination J2000 (seconds)
  34-40    F7.2  mas/y  pmRA         Proper motion in Right Ascension (mas/yr)
  41-47    F7.2  mas/y  pmDEC        Proper motion in Declination (mas/yr)
  48-53    F6.3  ---    Bmag         B magnitude in Johnson system (Cat. I/280B)
  54-59    F6.3  ---    Vmag         V magnitude in Johnson system (Cat. I/280B)
  60-65    F6.3  ---    Rmag         R magnitude in Johnson system (Cat. II/7A)
     66      I1  ---    f_Rmag       [0/1] Flag on Rmag value (2)
  67-72    F6.3  ---    Imag         I magnitude in Johnson system (Cat. II/7A)
     73      I1  ---    f_Imag       [0/1] Flag on Imag value (2)
  74-79    F6.3  ---    Jmag         J magnitude in Johnson system
                                         (Cat. II/246, II/7A)
  80-85    F6.3  ---    Hmag         H magnitude in Johnson system
                                         (Cat. II/246, II/7A)
  86-91    F6.3  ---    Kmag         K magnitude in Johnson system
                                         (Cat. II/246, II/7A)
  92-97    F6.3  mas    LDD          Limb-Darkened Diameter
 98-102    F5.3  mas    e_LDD        Error on Limb-Darkened Diameter (3)
103-108    F6.3  mas    UDDB         Uniform diameter at B band
109-114    F6.3  mas    UDDV         Uniform diameter at V band
115-120    F6.3  mas    UDDR         Uniform diameter at R band
121-126    F6.3  mas    UDDI         Uniform diameter at I band
127-132    F6.3  mas    UDDJ         Uniform diameter at J band
133-138    F6.3  mas    UDDH         Uniform diameter at H band
139-144    F6.3  mas    UDDK         Uniform diameter at K band
145-150    F6.2  mas    plx          Parallax (Cat. I/280B)
151-155    F5.2  mas    e_plx        Error on Parallax (Cat. I/280B)
156-171     A16  ---    SpType       Spectral type (Cat. I/280B)
172-176      I5  K      Teff_SpType  Effective temperature adopted from spectral
                                         type
177-182    F6.3  cm.s-  logg_Sptype  Gravity adopted from spectral type

Note (1): Additionnally, the absence of a particular star in this catalog can also be
 due to a missing photometry in one of the base catalogs. Conversely, the rejection of binaries
 depends on their availabilty as such in the relevant catalogues. 
Note (2): Magnitude flag:
    1: the corresponding magnitude is a measurement
    0: the corresponding magnitude is an estimate based on the colors deduced
       from the spectral type. In this case, due to the discrete nature of the
       tables (SpType - color) used, a discretization appears in the diagrams
       using the colors (V-I) and (V-R).
Note (3): We provide only one error for all angular diameters, since
    the linear corrections between Uniform Disk diameters and the
    Limb-Darkened diameter lead to negligible corrections on the
    UDdiam errors.

Acknowledgements:
This research has made use of the VizieR catalogue access tool, CDS, Strasbourg,
France.
This research has made use of the SIMBAD database, operated at CDS, Strasbourg,
France.
This research has made use of the TOPCAT (http://www.starlink.ac.uk/topcat/) and
STILTS (http://www.starlink.ac.uk/stilts/) software, provided by Mark Taylor of
Bristol University, England.
================================================================================
(End)                    Lafrasse, S., 31/03/2010
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