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II/346      JMMC Stellar Diameters Catalogue - JSDC. Version 2  (Bourges+, 2017)

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
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 ( 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 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 ( 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 JSDCv2v1_dis.vot (jsdc_dis.dat) summarizes this difference. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file jsdc_v2.dat 367 465877 Stellar diameters catalogue, version 2 jsdc_v2.fits 2880 33329 Fits version of the catalog jsdc_dis.dat 93 1917 Data for stars having more than 2 sigma difference between JSDC 1 and 2 jsdcv2v1_dis.vot 166 21142 VOTable version of jsdc_dis.dat figs/* 0 3 Figures of 3 diagrams
See also: II/224 : Catalogue of Stellar Diameters (CADARS) (Pasinetti-Fracassini+ 2001) II/300 : JMMC Stellar Diameters Catalogue - JSDC (Lafrasse+, 2010) : JSDC home page : GetStar utility page Byte-by-byte Description of file: jsdc_v2.dat
Bytes Format Units Label Explanations
1- 33 A33 --- Name Normalised star name (preferably HD) 35- 36 I2 h RAh Right ascension (J2000) 38- 39 I2 min RAm Right ascension (J2000) 41- 48 F8.5 s RAs Right ascension (J2000) 50 A1 --- DE- Declination sign (J2000) 51- 52 I2 deg DEd Declination (J2000) 54- 55 I2 arcmin DEm Declination (J2000) 57- 63 F7.4 arcsec DEs Declination (J2000) 65- 84 A20 --- SpType Spectral Type from Simbad 86- 92 F7.3 mag Bmag ?=- B magnitude (Cat. I/259) 94-101 F8.6 mag e_Bmag ?=- Error on Bmag (Cat. I/259) 103-109 F7.3 mag Vmag ?=- V magnitude (Cat. I/259) 111-115 F5.3 mag e_Vmag ?=- Error on Vmag (Cat. I/259) 117-126 F10.6 mag Rmag ?=- R magnitude (estimated) 128-137 F10.6 mag Imag ?=- I magnitude (estimated) 139-145 F7.3 mag Jmag ?=- J magnitude (Cat. II/246) 147-151 F5.3 mag e_Jmag ?=- Error on Jmag (Cat. II/246) 153-159 F7.3 mag Hmag ?=- H magnitude (Cat. II/246) 161-165 F5.3 mag e_Hmag ?=- Error on Hmag (Cat. II/246) 167-173 F7.3 mag Kmag ?=- K magnitude (Cat. II/246) 175-179 F5.3 mag e_Kmag ?=- Error on Kmag (Cat. II/246) 181-187 F7.3 mag Lmag ?=- L magnitude (Cat. II/311/wise W1mag) 189-193 F5.3 mag e_Lmag ?=- Error on Lmag (Cat. II/311/wise e_W1mag) 195-200 F6.3 mag Mmag ?=- M magnitude (Cat. II/311/wise W2mag) 202-206 F5.3 mag e_Mmag ?=- Error on Mmag (Cat. II/311/wise e_W2mag) 208-217 F10.6 mag Nmag ?=- N magnitude (Cat. II/311/wise W3mag) 219-223 F5.3 mag e_Nmag ?=- Error on Nmag (Cat. II/311/wise e_W3mag) 225-233 F9.6 mas LDD ?=-1 Limb-Darkened Disk diameter 235-242 F8.6 mas e_LDD ?=-1 Error on LDD (and all UDDs) (1) 244-255 E12.6 --- LDDCHI Chi2 of LDD fitting (2) 257 I1 --- CalFlag [0/7] Confidence flags for using this star as a calibrator in Optical Interferometry experiments (3) 259-268 F10.6 mas UDDB ?=-1 Uniform Disk Diameter in band B (4) 270-279 F10.6 mas UDDV ?=-1 Uniform Disk Diameter in band V (4) 281-290 F10.6 mas UDDR ?=-1 Uniform Disk Diameter in band R (4) 292-301 F10.6 mas UDDI ?=-1 Uniform Disk Diameter in band I (4) 303-312 F10.6 mas UDDJ ?=-1 Uniform Disk Diameter in band J (4) 314-323 F10.6 mas UDDH ?=-1 Uniform Disk Diameter in band H (4) 325-334 F10.6 mas UDDK ?=-1 Uniform Disk Diameter in band K (4) 336-345 F10.6 mas UDDL ?=-1 Uniform Disk Diameter in band L (4) 347-356 F10.6 mas UDDM ?=-1 Uniform Disk Diameter in band M (4) 358-367 F10.6 mas UDDN ?=-1 Uniform Disk Diameter in band N (4
Note (1): This error takes into account a 2% error (added quadratically) added as a provision for the estimated biases. Note (2): value of Mean-diameter chi-square as in Appendix A.2 of Chelli et al., 2016A&A...589A.112C. Note (3): CalFlag is a bit field: bit zero is set if LDD_CHI is above 5; bit 1 is set if the star is a known double in WDS (Cat. B/wds/wds) with separation inferior to 1 arcsec; bit 2 is set if the star is, according to Simbad's OTYPEs, one of the following codes: "C*", "S*", "Pu*", "RR*", "Ce*", "dS*", "RV*", "WV*", "bC*", "cC*", "gD*", "SX*", "Mi*", "SB*", "Al*", which signals a possible binarity or pulsating stars. Although none of these bit flags prevent the LDD estimate to be accurate, they imply some caution in choosing this star as a calibrator star for Optical Long-Baseline Interferometry. Note (4): The error on this value is equal to e_LDD. See Description for information about the conversion LDD to UDD.
Byte-by-byte Description of file: jsdc_dis.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name HIP or Tycho name 18- 19 I2 h RAh Right ascension (J2000) 21- 22 I2 min RAm Right ascension (J2000) 24- 29 F6.3 s RAs Right ascension (J2000) 31 A1 --- DE- Declination sign (J2000) 32- 33 I2 deg DEd Declination (J2000) 35- 36 I2 arcmin DEm Declination (J2000) 38- 42 F5.2 arcsec DEs Declination (J2000) 44- 48 F5.3 --- LDD1 Limb-Darkened Disk diameter of JSDC1 50- 54 F5.3 --- e_LDD1 rms uncertainty on LDD1 57- 64 F8.6 --- LDD2 Limb-Darkened Disk diameter of JSDC v2 66- 73 F8.6 --- e_LDD2 rms uncertainty on LDD2 75- 82 F8.5 --- LDDchi2 Reduced chi-square of the LDD diameter estimation 84- 93 F10.7 --- dLDD Difference in sigma (LDD1-LDD2)/e_LDD1)
Acknowledgements: Please cite the reference publication 2016A&A...589A.112C and use the following acknowledgement: "This research has made use of the Jean-Marie Mariotti Center JSDC catalog, available at" Gilles Duvert, gilles.duvert(at) History: * 05-Jan-2017: First on-line version with "only" 467585 stars * 20-Jan-2017: Complete catalog with 471255 stars * 06-Mar-2017: New vesion with 465877 stars * 11-May-2017: JSDCv2v1_ discrepancies file added
(End) Gilles Duvert [IPAG, OSUG, France], Patricia Vannier [CDS] 02-Jan-2017
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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