************************************************************** * Documentation for ZC Tycho2 * * * * D Herald * * May 2003 * ************************************************************** This version of Robertson's Zodiacal catalogue was generated as a peripheral part of the development of the XZ80Q catalogue. This version of the ZC catalogue is based on the Hipparcos and Tycho-2 catalogues. 1. Generating the catalogue The catalogue was generated in the following manner: a. All entries in the XZ80Q catalogue having a ZC identifier were extracted. NOTE: This occurred before UCAC positions were added to XZ80Q - so that the positions in this version of the ZC catalogue are either Hipparcos, or Tycho-2 position. The XZ number of these stars is given in the last field of each record. b. The XZ80Q eliminated 5 ZC stars on the basis that their ecliptic latitude was greater than 7d. The details for these stars were copied from XZ80P, where Hipparcos positions were available for all 5 stars. The XZ number of these stars is given in the last field of each record, with an asterisk '*' preceding 'XZ' c. 295 ZC stars have never been included in the XZ catalogues. Positions for 288 of these were extracted from the Hipparcos catalogue. The remaining 7 were extracted from the Tycho-2 catalogue. No XZ number is given for these stars. Also, no attempt has been made to include BD numbers, and other cross-references, for these stars. 2. Format of the Catalogue The format of the catalogue is the same as for XZ80Q, except for the record length, and last field. The catalogue is formatted with a fixed record length of 206 characters, with characters 205/206 being a Carriage Return / Line Feed sequence. A record exists for all possible ZC numbers, so that the record number is the same as the ZC number. A byte-by-byte description of the ZC Tycho2 catalog is given below. The Format column gives the field format in Fortran notation, as for XZ80P. Byte(s): (Format) Description 1- 2: (A2) 'ZC' 3- 6: (I4) [1-3539] ZC number 7- 8: (A2) [BD,SD,CD,CP] Durchmusterung (DM) identifier 9- 17: (A1,I2,I5,A1) DM zone and number 18: (A1) [CcDdWwMS] Double star code (DSC), with the following meaning C = double, component in XZ80Q, Separation <1" c = double, component not in XZ80Q, Separation <1" D = double, component in XZ80Q, Separation <10" d = double, component not in XZ80Q, Separation <10" W = double, component in XZ80Q, Separation >10" w = double, component not in XZ80Q, Separation >10" M = multiple system, all components in XZ80Q S = multiple system, some but not all in XZ80Q 19: (A1) [EeVvSs] Variable star code, with the following meaning E = eclipsing-type variable, magnitude variation >0.5 mag e = eclipsing-type variable, magnitude variation <0.5 mag V = other variable, magnitude variation >0.5 mag v = other variable, magnitude variation <0.5 mag S = suspected variable, magnitude variation >0.5 mag s = suspected variable, magnitude variation <0.5 mag 20- 24: (F5.2) V magnitude 25: (A1) [ THX] V magnitude source flag (blank= Johnson V from HIP, T= Johnson V computed from VTmag and BTmag from TYC, H= Hpmag from HIP, X= visual from XZ80N) 26- 36: (I2,I2,F7.4) Right ascension (hms), epoch and equinox J2000.0, ICRS for HIP and ACT stars, FK5 for others 37- 44: (F8.4) Proper motion in right ascension (s/cy) 45- 55: (A1,I2,I2,F6.3) Declination (d'"), epoch and equinox J2000.0, ICRS for HIP and ACT stars, FK5 for others 56- 63: (F8.3) Proper motion in declination ("/cy) 64- 66: (F3.0) Trigonometric parallax (mas) 67: (A1) [ X] Trigonometric parallax source flag (blank= from HIP, X= from XZ80N) 68- 73: (F6.1) Radial velocity (km/s) 74: (A1) [ X] Radial velocity source flag (blank= form HIC, X= from XZ80N) 75- 78: (F4.0) Standard error in RA*cos(Dec) at source epoch (mas) 79- 82: (F4.0) Standard error in PM in RA at source epoch (mas/cy) 83- 86: (F4.0) Standard error in Dec at source epoch (mas) 87- 90: (F4.0) Standard error in PM in Dec at source epoch (mas/cy) 91- 97: (F7.2) Source epoch (yr) 98-102: (F5.2) B magnitude 103: (A1) [ B] B magnitude source flag (blank= Johnson B from HIP, B= Johnson B computed from VTmag and BTmag from TYC) 104-115: (A12) Spectral type 116: (A1) [ X] Spectral type source flag (blank= from HIP, X= from XZ80N) 117-129: HIP number and flags, TYC ID, or UCAC1 ID For HIP stars 117: (A1) 'H' 118-123: (I6) [1-120416] HIP number 125: (I1) [1-4] Sequential number for the same HIP number given in HIP double/multiple systems annex [5-8] 5 = 1+2; 6 = 1+3; 8 = 2+3 126: (I1) [1-4] Number of stars with the same HIP number given in HIP double/multiple systems annex (bytes 125-126 are given for stars of byte 127=C) 127: (A1) [CGOVX] Double/multiple systems flag indicating further details are given in HIP annex: C= solutions for the components G= acceleration or higher order terms O= orbital solutions V= variability-induced movers X= stochastic solution 128: (A1) [FIL] Type of solution: F= fixed double or multiple system (identical proper motions and parallaxes), I= individual parallaxes and linear (relative) motion (possible optical double star) L= linear double or multiple system (may have different proper motions but assumed to have same parallax) 129: (A1) [ABCDS] Double/multiple star solution quality (A=good, B=fair, C=poor, D=uncertain, S=suspected non-single) For TYC stars 117: (A1) 'T' 118-129: (A12) TYC ID [rrrr-nnnnn-c] where rrrr is the GSC region, nnnnn is the GSC number in the region, and c is the component number. 130-139: (A10) CCDM identifier 140-141: (A2) CCDM component identifiers 142-147: (I6) SAO number 148-151: (I4) ZC number 152-157: (I6) PPM number 158-166: (A1,I2,I5,A1) AGK number 167-172: (I6) HD number 173-177: Flags for HIP and TYC stars For HIP stars (these are not given for components of double/multiple stars) 175: (A1) [CDMPRU] Variability type: C= no variability detected ("constant") D= duplicity-induced variability M= possibly micro-variable (amplitude < 0.03mag) P= periodic variable R= V-I color index was revised due to variability analysis U= unsolved variable which does not fall in the other categories 176: (A1) [12] Additional data about variability given in HIP annex For TYC stars 173: (A1) [ X] Reference flag for astrometry: blank= a recommended astrometric reference star X= a dubious astrometric reference star in TYC 174: (I1) [1-9] Astrometric quality flag: 1 through 5= very high to medium quality; probably single stars 6= perhaps non-single 7= low astrometric quality 8= perhaps non-stellar 9= very low astrometric quality 175: (A1) [GN] Known variability from GCVS/NSV: G= star in General Catalogue of Variable Stars, 4th Edition N= star in New Catalogue of Suspected Variable Stars 176: (A1) [UVW] Variability from TYC: U= apparent variability in TYC data; may be due to duplicity V= strong evidence of variability in the TYC data W= variability suspected in the TYC data 177: (A1) [DRSYZ] Duplicity from TYC: D= duplicity clearly indicated (BTmag and VTmag refer to combined light) R= duplicity weakly indicated, combined with indication of variability S= duplicity suspected Y= investigation of duplicity made, no indication of duplicity Z= no investigation of duplicity was performed 178-179: (I2) Source code for position and proper motion: 01= HIP 11= Tycho-2 12= Tycho-2 - with proper motion being for the mean position of a close pair 13= Tycho-2 - with no proper motion. Position is for epoch 14= Tycho-2 Supplement 1 180 : (A1) [N] Flag for existence of names for the star in XZStarNames.dat blank= no star name N= star name(s) in XZStarNames.dat file 181 : (A1) '*' if the star is in XZ80P, but excluded from XZ80Q because its latitude was > 7d. 182-183: (A2) 'XZ' if the star is in the XZ80Q catalogue 184-189: (I6) Number in XZ80Q catalogue 205-206: CR/LF sequence D Herald 29 May 2003