CDROM/APJS/V112/P557 Classification of IRAS Sources (Kwok+ 1997) ================================================================================ Classification and Identification of IRAS Sources With Low-Resolution Spectra Sun Kwok, Kevin Polk, and William P. Bidelman <1997, ApJS, 112, 557> =1997ApJS..112..557K ================================================================================ Abstract: IRAS low-resolution spectra were extracted for 11,224 IRAS sources. These spectra were classified into astrophysical classes, based on the presence of emission and absorption features and on the shape of the continuum. Counterparts of these IRAS sources in existing optical and infrared catalogs are identified, and their optical spectral types are listed if they are known. The correlations between the photospheric/ optical and circumstellar/infrared classifications are discussed. Keywords: catalogs -- circumstellar matter -- infrared stars -- stars: AGB and post-AGB -- stars: fundamental parameters Description: The table data are presented as delivered from the author. There are 11,224 records with each field separated by an ASCII TAB character. As noted by the authors, "By not having the blanks it is very compact, and very easy to retreive into a database by common software." As such, the table is not conducive to being automatically converted to FITS ASCII format. In the description below, rather than list the fixed-field Fortran formats, C-style formats are given to represent the data fields, as follows: "%s" indicates a variable-length string (the maximum length of the string is given in the Descriptions); "%d" indicates an integer value; and "%f" indicates a floating-point (real) value. Also, the first column of the byte-by-byte description gives only the field number. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table1.dat 91 11224 Index measurements -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Field Format Units Label Explanations -------------------------------------------------------------------------------- 1 %s --- IRAS *IRAS Source name (max. length 11 bytes) 2 %s --- SAO *SAO designation (max. length 6 bytes) 3 %s --- HD_BD *HD or BD designation (max. length 12 bytes) 4 %s --- GCVS *GCVS designation (max. length 12 bytes) 5 %s --- IRC *IRC designation (max. length 7 bytes) 6 %s --- AFGL *AFGL designation (max. length 12 bytes) 7 %s --- Other *Other designation (max. length 34 bytes) 8 %s --- Sp *Optical spectral type (max. length 30 bytes) 9 %s --- LRS LRS classification (max length 1 byte) 10 %d Jy Flux_12 12 um IRAS flux 11 %f Jy C12-25 12um-25um color 12 $i --- Peak_12 *12 um Peaker -------------------------------------------------------------------------------- Notes for file: table2.dat -------------------------------------------------------------------------------- IRAS: The IRAS sources in order of increasing right ascension (J1950) with the PSC designation. SAO: The probable SAO catalog number of the source, taken mainly but not entirely from the PSC. Because of the SAO catalog's accurate positions, identifications with its stars are considerably more secure than those with less accurate coordinates. HD_BD: Probable indentifications with Henry Draper stars, or, for objects not included therein, with stars listed in the Bonner or Cordoba Durchmusterungs. Henry Draper Extension numbers are not used. The use of the Cordoba catalog for the entire southern sky seems appropriate for red stars that would perhaps not be contained in the Cape Photographic Durchmusterung (CPD); note that this is not the convention followed in the HD or SAO catalogs. A very few CPD designations have been used for stars not in the Cordoba Durchmusterung. A Durchmusterung designation may contain an extended ASCII character for the degree symbol, (0xf8, decimal 248). GCVS: Variable star name from the General Catalogue of Variable Stars (GCVS; Kholopov et al. 1985-1987), or in the New Catalogue of Variable Stars (NSV; Kukarkin et al. 1982). IRC: Identification from the CalTech Two-Micron Survey (Neugebauer & Leighton 1969). AFGL: Identification from the Revised AFGL Infrared Sky Survey Catalogue (Price & Murdock 1983). Other: Identification from the Bright Star Catalogue (Hoffleit 1982), with either their Bayer Greek letter or Flamsteed numbers or with their HR numbers. Identifications with carbon and S-type stars from Stephenson's (1984, 1989) comprehensive catalogs use "CS" or "SS", respectively. Also listed are the objects included in the First Interim Equatorial Catalog (EIC; Sweeney et al. 1978). Various other identifications are made with HII regions, planetary nebulae, emission-line objects contained in the Mount Wilson catalog and so on. Sp: Optical spectral types of the IRAS sources that are considered stellar, compiled from a number of disparate sources by W. P. Bidelman. The symbols in parenthesis are interpreted as follows: (PN) - the object is thought to be a planetary nebula (neb) - the source is believed to be a nebula (H II) - the source either has been detected as an H II region by radio continuum observations or is a well-known bright nebula (SiC) - the object has not been optically classified as a carbon star but the LRS spectrum shows the 11.3 um emission feature of SiC. Peak_12: "25 um Peakers" (see Bidelman 1987, in IAU Symp. 122, Circumstellar Matter, ed. I. Appenzeller & C. Jordan (Dordrecht: Reidel), 217), IRAS sources whose flux density at 25 um is higher than their flux densities at 12 and 60 um. -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 27-Jul-97