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内容介绍
NSSDC/WDC-A-R&S 89-08 SMITHSONIAN ASTROPHYSICAL OBSERVATORY STAR CATALOG (SAO) DOCUMENTATION FOR THE MACHINE-READABLE VERSION (VERSION 1990) Nancy G. Roman and Wayne H. Warren Jr. June 1989 November 1990 ABSTRACT An updated, corrected and extended machine-readable version of the catalog is described. Published and unpublished errors discovered in the previous version have been corrected, and multiple-star and supplemental BD identifications have been added to stars where more than one SAO entry has the same Durchmusterung number. Henry Draper Extension (HDE) numbers have been added for stars found in both volumes of the extension. Data for duplicate SAO entries (those referring to the same star) have been flagged. J2000 positions in usual units and in radians have been added. National Space Science Data Center (NSSDC)/ World Data Center A for Rockets and Satellites (WDC-A-R&S) National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt, Maryland 20771 TABLE OF CONTENTS Section 1 - Introduction and Procedure . . . . . . . . . . . . 1-1 Section 2 - File Contents . . . . . . . . . . . . . . . . . . 2-1 Section 3 - File Characteristics . . . . . . . . . . . . . . . 3-1 Section 4 - Remarks, Acknowledgments and References . . . . . 4-1 Section A - Addendum for 1990 Version . . . . . . . . . . . . A LIST OF TABLES Table 1 File Contents . . . . . . . . . . . . . . . . . . . . . . 2- 1 2 Explanation of HD Codes . . . . . . . . . . . . . . . . . 2- 5 3 Visual Magnitude Sources . . . . . . . . . . . . . . . . 2- 6 4 Star-Number Sources and Footnotes . . . . . . . . . . . . 2- 7 5 Photographic Magnitude Sources . . . . . . . . . . . . . 2- 7 6 Proper-Motion Sources . . . . . . . . . . . . . . . . . . 2- 8 7 Spectral-Type Sources . . . . . . . . . . . . . . . . . . 2- 8 8 Miscellaneous Coded Remarks for Duplicity and Variability 2- 9 9 References for the Source Catalogs . . . . . . . . . . . 2-10 10 File Characteristics . . . . . . . . . . . . . . . . . . 3- 1 11 References for Changes to the SAO Catalog, Version 1984 . 4- 1 12 Explanatory Notes to Individual Changes . . . . . . . . . 4- 2 13 Changes to the 1984 Version . . . . . . . . . . . . . . . 4- 3 14 Sources for Changes Since 1984 Version . . . . . . . . . 4- 6 15 Changes to the 1990 Version . . . . . . . . . . . . . . 4- 7 16 Sources for 1990 Changes . . . . . . . . . . . . . . . . 4- 8 ii SECTION 1 - INTRODUCTION AND PROCEDURE INTRODUCTION A character-coded machine-readable version of the "Smithsonian Astrophysical Observatory Star Catalog" (SAO, SAO Staff 1966) was prepared by T. A. Nagy (1979) from a packed binary tape obtained from the Smithsonian Astrophysical Observatory. In addition to certain format modifications, equatorial coordinates in radians and cross identifications from the Table of Correspondences SAO/HD/DM/GC (Morin 1973) were added to the converted version; however, the known errata lists were not incorporated at that time. This version of the catalog served as a starting point for the version described here. As a prelude to creation of the 1984 version of the SAO, a new version of the "SAO-HD-GC-DM Cross Index" was prepared (Roman, Warren and Schofield 1983), since most of the changes and extensions for the SAO involve data presently in the Cross Index. The original SAO did not use lower case letters, making some spectral types seem strange. All capital letters that really should have been lower case in the spectral types have been changed. These changes, which are numerous, are not listed in Table 1. The 1984 version of the SAO contains the corrected and extended cross identifications, all errata published up to January 1984 and known to us, numerous errors forwarded to us by colleagues, and errors discovered at the Astronomical Data Center during the course of this work. Recently, Clayton A. Smith of the U.S. Naval Observatory, volunteered to provide J2000.0 positions and proper motions for the SAO stars. These data have been added to the end of each record, the positions in both sexigessimal and radian form. Additional errors of which we are aware (as of May 1991) have been corrected. This document describes the current version of the machine-readable SAO Catalog. It outlines the procedures used to correct and extend the previous versions and is intended to enable users to read and process the data without problems and guesswork. The following section describes the analysis and methods used to cross identify the stars and to add component identifications for stars where more than one SAO record has the same Durchmusterung (DM) identification. Section 2 provides detailed descriptions of the catalog format and codes used in the data records, while Section 3 contains information on the characteristics of the magnetic tape file. Miscellaneous remarks and sources for the corrections incorporated into each version and in this version are given in Section 4, which also contains bibliographical references. A sample listing of data records exactly as they are recorded in the machine-readable form comprises Section 5. A copy of this document should accompany any machine-readable version of the SAO Catalog, originating from any one of the International Network of Astronomical Data Centers. PROCEDURE The assignment of components to SAO stars for which more than one entry has the same DM number was done when preparing the 1983 SAO-HD-GC-DM Cross Index. That procedure is described in Roman et al. (1983). A somewhat less detailed description is given here for completeness. Components were assigned according to the Index Catalogue of Visual Double Stars 1 - 1 (IDS, Jeffers et al. 1963; Worley 1980); for stars not in the IDS, components were labeled according to visual magnitude. Supplemental (footnoted) BD stars (Warren and Kress 1980) were identified and entered with lower case letters. Corrections and additions to cross-identification data were made as necessary. Some duplicate DM numbers actually referred to the same star for which SAO data had been obtained from different source catalogs. In these cases, one record has been marked "D" in byte 7, normally the one whose position was judged to be of lower accuracy. However, all data have been retained so that a different choice may be made by the user. Many stars occur in two DM catalogs (CD, CPD) in the southern hemisphere. The SAO gives numbers from different catalogs for the components of some double stars; hence, although there are no duplicate DM numbers, component confusion can occur. Although a search for such systems was not exhaustive, the catalog was searched for adjacent entries with declinations within 3 arcmin of each other. Most of these entries proved to be double stars and were appended with letter designations as if their DM numbers had been the same. These DM numbers were not changed. An important subset of rather bright stars in the published SAO Catalog has no DM numbers given. (Most of the stars in this subset were identified as FK3 double stars which were omitted from the FK4.) Many of these had been identified by W. L. Stein, who supplied probable DM numbers. The positions for these stars were compared manually with their positions in the various DM catalogs and m
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