The Starbase One Astronomy & Space Collection

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R-SAW-7/79-04 DOCUMENTATION FOR THE MACHINE-READABLE VERSION OF THE CATALOGUE OF REFLECTION NEBULA July 1979 Contract NAS 5-25369 Theresa A. Nagy Prepared for: National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt, Maryland 2077l Prepared by: Systems and Applied Sciences Corporation 68ll Kenilworth Avenue Riverdale, Maryland 20840 TABLE OF CONTENTS Section 1 - Introduction....................................1-1 Section 2 - File Contents...................................2-1 Section 3 - File Characteristics ...........................3-1 Section 4- Remarks and Modifications........................4-1 LIST OF TABLES Table 2-1 File Contents ......................................2-1 3-1 File Characteristics................................3-1 SECTION 1 - INTRODUCTION In recent years there has been a trend away from publishing catalogues in book form to preparing catalogues by computer and distributing them on magnetic tape, with appearance in book form a secondary occurrence. This memo is the result of the development of the documentation for the machine-readable ver- sion of the catalogue and includes the basic information given in the original preface of the published catalogue. This memo should be distributed along with any copy of the machine-readable version of the catalogue. 1-1 SECTION 2 - FILE CONTENTS A byte-by-byte description of the contents of the catalogue is given in Table 2-1. The information in the "Description" column is derived mainly from the published version of the catalogue whenever possible. The "Suggested Format" column is for FORTRAN-formatted reads. Table 2-1. File Contents (1 of 3). CATALOGUE OF REFLECTION NEBULA Suggested Bytes Description Format 1 "V" A1 2-4 van den Bergh catalogue number I3 5 "*" if remark given; blank otherwise A1 6-15 Bonn (BD) or Cordoba Durchmusterung (CD) number 6-7 Catalog Designation A2 8 Sign of declination zone A1 9-10 Zone (degrees) I2 11-15 Sequential number within zone I5 16 Blank 1X 17-24 Henry Draper (HD) number 17-22 HD number I6 23 "-" if second designation given; A1 blank otherwise 24 last digit of second designation if I1 applicable 25-29 Galactic longitude (degrees) F5.1 30-34 Galactic latitude (degrees) F5.1 35 Blank 1X 36-44 Spectral types from the Jaschek, Conde, and 9A1 de Sierra (1964) La Plata catalogue 45-49 V magnitude - photoelectric values from the F5.2 Warner and Swasey Observatory card catalogue when given to two decimals. V magnitude - others are from the BD and CD catalogues (values are systematically too bright for the fainter stars) 50 "V" if variable magnitude; blank otherwise A1 2-1 Table 2-1. File Contents (2 of 3) Suggested Bytes Description Format 51-55 Type I = nebula in which the illuminating star 5A1 is embedded in the nebulosity Type II = nebula in which the illuminating star is located outside the illuminated nebulosity (types given are: I, II, I-II, II P (peculiar), II:, P(peculiar) 56-57 Blank 2X 58-61 Surface brightness on the blue prints of the 4A1 Palomar Sky Survey (PSS) - coded as follows: VBR very bright BR bright M moderate F faint VF very faint ":" at end of code implies designation uncertain 62-65 Colors coded as follows: 4A1 VB very blue B blue MB moderately blue I intermediate (equally bright on the blue and red prints of the PSS) MR moderately red R red VR very red ":" at the end of code implies designation uncertain 66-70 Absorption in the field containing reflection 5A1 nebula - coded as follows: STR strong MOD moderate WK weak ABS absent These estimates are quite uncertain and may exhibit a systematic dependence on distance. 2-2 Table 2-1. File Contents (3 of 3) Suggested Bytes Description Format 71-75 R(B) = maximum radii observed on the blue F5.1 prints of the PSS (arc minutes) For stars like AE Aur, which is surrounded by both emission and reflection nebulosity, the quoted radius refers to the reflection nebula only. 76 ":" If last digit is uncertain; blank otherwise A1 77-81 R(R) = maximum radii observed on the red F5.1 prints of the PSS (arc minutes) Same note as for bytes 71-75. 82 ":" If last digit is uncertain; blank otherwise A1 2-3 SECTION 3 - FILE CHARACTERISTICS The information contained in this section is sufficient for the user to read the machine-readable version of the catalogue. The statistics of the contents of the entire file are given in Table 3-1. Table 3-1. File Characteristics. CATALOGUE OF REFLECTION NEBULA CATALOGUE.......................................VDB NUMBER OF FILES.................................1 LOGICAL RECORD LENGTH (BYTES)...................82 RECORD FORMAT ..................................Fixed TOTAL NUMBER OF LOGICAL RECORDS.................158 3-1 SECTION 4 - MODIFICATIONS AND REMARKS The machine-readable version of the van den Bergh Reflection Nebulae Cata- logue was received from the University of Maryland. This catalogue was pub- lished In 1966 in the Astronomical Journal (volume 71, pages 990-998). The original card deck was in the 026 punch and this was converted to a 029 deck. Two keypunch errors were corrected in the 029 version 1. #34 - the spectral type was changed from 09.5V to O9.5V (zero to oh) 2. #112 - the brightness was changed from ";"to "F" 4-1