ADC/CDS Standard Document for Catalog:
/journal_tables/AJ/121/2148/

1. Use the ADC Data Viewer Suite to visualize the data.
2. Get the data files via anonymous FTP. (See Note.)

J/AJ/121/2148       Precise spectral types for 372 A, F & G stars  (Gray+, 2001)
================================================================================
The physical basis of luminosity classification in the late A-, F-, and
 early G-type stars. I. Precise spectral types for 372  stars.
    Gray R.O., Napier M.G., Winkler L.I.
   <Astron. J. 121, 2148 (2001)>
   =2001AJ....121.2148G
================================================================================
ADC_Keywords: Stars, late-type ; MK spectral classification ; Stars, A-type ;
              Stars, F-type ; Stars, G-type ;
Keywords: stars: fundamental parameters - stars: late-type

Abstract:
    This is the first in a series of two papers that address the problem
    of the physical nature of luminosity classification in the late A-,
    F-, and early G-type stars. In this paper, we present precise spectral
    classifications of 372 stars on the MK system. For those stars in the
    set with Stroemgren uvby{beta} photometry, we derive reddenings and
    present a calibration of MK temperature types in terms of the
    intrinsic Stroemgren (b-y)_0_ index. We also examine the relationship
    between the luminosity class and the Stroemgren c_1_ index, which
    measures the Balmer jump. The second paper will address the derivation
    of the physical parameters of these stars, and the relationships
    between these physical parameters and the luminosity class. Stars
    classified in this paper include one new {lambda} Bootis star and 10
    of the F- and G-type dwarfs with recently discovered planets.

File Summary:
--------------------------------------------------------------------------------
 FileName  Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe        80        .   This file
table1.dat    80      372   MK classifications of late A-, F-, and
                             early G-Type stars
notes.dat     80      109   Individual notes
--------------------------------------------------------------------------------

See also:
   J/AJ/121/2159 : Basic parameters for 372 A, F & G stars (Gray+, 2001)
   http://nedwww.ipac.caltech.edu/level5/Gray/frames.html :
          A digital spectral classification atlas (R. O. Gray)

Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 11  A11   ---     Name      The HD (Cat. <III/135>) or other name (1)
  13- 16  I4    ---     HR        ? The HR (Cat. <V/50>) number
  18- 31  A14   ---     Star      Star name
      33  A1    ---     Std       [*] Indicates an MK standard star
  35- 39  F5.2  mag     Vmag      The V-band magnitude
      41  A1    ---     uvby      [ync] Indicates the status of Stromgren uvby
                                   photometry in the literature (2)
      43  A1    ---     beta      [ync] Indicates the status of Stromgren {beta}
                                   photometry in the literature (2)
  45- 48  F4.2  mag     E(b-y)    ? The E(b-y) reddening (3)
  50- 76  A27   ---     SpType    Spectral type (4)
  78- 80  A3    ---     Notes     Further notes (5)
--------------------------------------------------------------------------------
Note (1): Stars in this table are ordered in terms of the HD number.
          Non-HD stars are placed at the end of the table.
Note (2):
    y = present
    n = absent
    c = present but photometry includes significant light from a companion star
Note (3): Determined using the methods of Crawford (1975AJ.....80..955C,
    1979AJ.....84.1858C) for the A- and F-type dwarfs and giants, and of
    Gray (1991A&A...252..237G, 1992A&A...265..704G) for the A-, F-, and
    early G-type supergiants.
Note (4): The notation used for the spectral types of metallic line (Am, Fm)
    stars is standard; separate spectral types are given for the CaII K
    line (k), the hydrogen lines (h), and the general metallic line
    spectrum (m), for example, kA7 hA8 mF2 (III), where the luminosity
    type is enclosed in parentheses because the spectrum shows the
    "anomalous luminosity effect" (Abt & Morgan, 1976ApJ...205..446A). On
    the other hand, spectral types for many of the metal-weak stars are
    given as a temperature type (usually deduced from the hydrogen lines
    and the morphology of the metallic line spectrum) plus luminosity
    type, followed by spectral types based on the strengths of the Ca II
    K-line and the general metallic line spectrum, for example, F4 V kF0
    mF0. In section 4, an alternate notation, based on Gray
    (1989AJ.....98.1049G), is given for some of these metal-weak stars.
Note (5):
    * = Comments in notes.dat file
    E = Star with extrasolar planet
    A,B = Component of double or multiple star
    H = Star in the Hyades
    P = Star in the Pleiades
    2 = Star present in PaperII (cat. <J/AJ/121/2159>)
--------------------------------------------------------------------------------

Byte-by-byte Description of file: notes.dat
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 10  A10   ---     Name      HD or BD number
  13- 80  A68   ---     Note      Text of the note
--------------------------------------------------------------------------------

History:
    From electronic version of the journal
================================================================================
(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    19-Jun-2001