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III/23B     MK Classification for OB Stars (Lesh 1968)
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MK Classification for OB Stars
    Lesh J.R.
    <ApJS, 17, 371 (1968)>
    =1968ApJS...17..371L
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ADC_Keywords: MK spectral classification; Stars, OB; Spectral types

Description:
   The catalog is a compilation of MK spectral types published in the paper,
   "The kinematics of the Gould Belt:  An Expanding Group?"  (Rountree Lesh
   1968).  Spectral types were determined for 464 stars of Henry Draper type
   B5 and earlier, brighter than 6.5 visual magnitude and higher than
   -20 degrees in declination.  The spectra were classified by the author
   using plates taken with the Yerkes 40-inch refractor and MK spectrograph.
   The catalog contains HR, HD numbers, MK types with temperature classes,
   subclasses, luminosity classes and peculiarities, and remarks.

File Summary:
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 FileName     Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe           80        .   This file
data1.dat        28      464   Catalog Data
data2.dat        80       41   Remarks
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Byte-by-byte Description of file: data1.dat
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   Bytes  Format  Units   Label     Explanations
--------------------------------------------------------------------------------
   1-  4   I4     ---     HR       *? BS = HR number
   6- 11   I6     ---     HD       *HD number
  13- 16   A4     ---     MKtype1  *Temperature class and subclass (MK type)
  18- 24   A7     ---     MKtype2  *Luminosity, peculiarities, etc. (MK type)
      28   A1     ---     flag     *Remarks flag
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Note on HR:         
  BS = HR number is the number from the Yale Catalogue of Bright Stars 
  (Hoffleit 1964).
         
Note on HD: 
  Number from The Henry Draper Catalogue (Cannon and Pickering 1918-1924)
           
Note on MKtype1:
  Spectral type classified in the MK system. 
             
Note on MKtype2:
  Spectral type classified in the MK system. Peculiarity codes include a new 
  classification scheme for the Be stars, assignment having been made based 
  upon the emission lines subsequent to MK spectral type and luminosity class
  assignment based on absorption lines alone. The following notation is used
  for the emission parameter: 

  e1   No overt hydrogen emission. Prototypes 66 Oph, 1H Cam. The H-beta 
       absorption line is partially or completely filled in, but is not 
       reversed. H-gamma may also show some filling in. The Fe II lines are 
       usually absent.
  e1+  Prototype 48 Per. H-beta has a narrow emission core while remaining 
       predominantly an absorption line.
  e2   H-beta in emission. Prototypes psi Per, 120 Tau. H-beta is an 
       emission line. H-gamma is also filled in but is not reversed, while 
       the other Balmer lines are not affected. The Fe II lines are often, 
       but not always, present.
  e2+  Prototype HD 45995. H-gamma shows a narrow emission core and the higher
       Balmer lines are slightly filled in. The Fe II lines are usually rather
       marked.
  e3   Complete hydrogen emission spectrum. Prototypes 11 Cam, HD 58050.
       H-beta is an emission line and the higher Balmer lines, at least 
       through H-epsilon, have emission cores. The Fe II lines are usually 
       present, except in the earliest spectral types, but they do not 
       dominate the spectrum.
  e3+  Prototype HD 41335. The Fe II lines are more prominent than at e3, but
       the hydrogen emission strength is less than at e4.
  e4   The extreme Be stars. Prototype chi Oph. There is intense emission in 
       all the Balmer lines, plus very strong Fe II lines (except in the 
       earliest types). This group is similar to the Bex class discussed by 
       Schild (1966).

Note on flag:
  An asterisk (*) denotes that remarks are present in data2.dat of the 
  catalog.

Byte-by-byte Description of file: data2.dat
--------------------------------------------------------------------------------
   Bytes  Format   Units   Label     Explanations
--------------------------------------------------------------------------------
   1-  6   A6      ---     HD       *HD number
   8- 80   A73     ---     rem      *Remarks
--------------------------------------------------------------------------------
Note on HD:
  HD number of the star in The Henry Draper Catalogue (Cannon and Pickering
  1918-1924)       
         
Note on rem:
 Remarks in free text (upper and lower case) form. When bytes 1-6 are blank, 
 this record continues the remarks for the previous star.

Remarks and Modifications:
  The machine-readable table MK Classification of OB Stars was received from
  the Centre de Donnees Astronomiques de Strasbourg on 5 April 1977. As
  received, the catalog consisted of HR numbers and spectral types with no
  spacing. The spectral types were recorded in all upper case characters as in
  the published table, except that peculiarities such as "SHELL", indicated by
  the notes to Table 4 in the published paper, had been added to the types
  themselves. The following modifications and additions to the
  machine-readable edition were made at the ADC: 
  1. Stars are identified by their HD numbers in the original publication
     (Rountree Lesh 1968), but the machine-readable catalog had only HR
     identifiers when received. A program was written to search the Yale
     Catalogue of Bright Stars (BSC3) (Hoffleit 1964) to retrieve HD numbers and
     insert them into the file. (The 1964 catalog was used because that version
     was cited in the MK classification work.) The same program reformatted the
     data to spread them a bit for improved readability. The HD numbers were
     proofread against the published table and an erroneous HR entry was found
     and corrected. One HD star not in the BSC3 had been omitted from the
     machine version -- it was added. 
  2. The spectral-type notation was modified to upper and lower case to match 
     the standard notation. All spectral types were proofread against the
     published table and corrections were made so that the information agrees
     exactly. 
  3. The notes to Table 4 of the published paper were keyed into a file and
     added to the machine version. Asterisk flags were added to the data file in
     byte 28 to indicate the presence of a remark. 
  4. Several duplicate records were found and eliminated. There are seven
     stars in the published paper whose spectral types are not given; these had
     been omitted in the machine version as received, but were added so that all
     stars in the original table (and thus discussed in the paper) are now
     included.

References:
  Cannon, A. J. and Pickering, E. C. 1918-1924, Ann. Astron. Obs. Harvard 
   College 91-99 (HD).
  Hoffleit, D. 1964, Yale Catalogue of Bright Stars (New Haven: Yale 
   University Observatory).
  Rountree Lesh, J. 1968, Astrophys. J. Suppl. 17, 371.
  Schild, R. E. 1966, Astrophys. J. 146, 142.
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(End)                       C.-H. Joseph Lyu [Hughes STX/NASA]  22-Jun-1995