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II/24       H-{alpha} Photometry of Northern Late-Type Stars I.   (Peat 1964)
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H-{alpha} Photometry of Late-Type Stars. I.
F-, G- and K-Type Stars North of the Equator
     Peat D.W.
    <Mon. Not. R. Astron. Soc., 128, 435 (1964)>
    =1964MNRAS.128..435P
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ADC_Keywords: Photometry, H-alpha; Stars, late-type; Stars, dwarfs

Description:
    Observations are presented of the strength of the H-{alpha} absorption
    line in the spectra of approximately 600 northern F,  G and K stars of
    differing luminosities and chemical compositions. Most of the stars in
    this   catalogue  were  previously  observed  by  Griffin  and  Redman
    (1960MNRAS.120..287G),  Deeming  (1960MNRAS.121...52D),   and  Griffin
    (1961MNRAS.122..181G).   Data given in this catalog include HD number,
    MK  spectral  classification,  high  velocity,   (B-V)   color  index,
    magnesium b ratio, sodium D line ratio and H-{alpha} ratio.

Introduction: (Peat, 1964)
    The integrated light-intensity within a band defined by the wavelength
    limits 6545-6580A,  centered on  the  wavelength  of  H-{alpha},   was
    measured  by  one  photomultiplier.   The  combined  integrated  light
    intensity within the  two comparison  regions defined  respectively by
    the  wavelength limits  6477.5 to  6495.0A and  6630.0 to  6647.5A was
    measured  by a second photomultiplier.  The wavelengths were monitored
    using the bright neon emission at  lambda  6402  produced  by  a  neon
    discharge tube, and were held constant to within +-0.5A. Errors of the
    order of +-  2A in  the  wavelength  setting,   however,   were  found
    experimentally  to have no effect on the results,  and corrections for
    the Doppler  shift due to  the stellar radial  velocity were therefore
    unnecessary.

    The  "H-{alpha}  ratio"   R,   was  defined  by  the  expression  R  =
    [B/B(L)]/[A/A(L)]  where  B,  A  represent the  photomultiplier output
    counts for a star, in the side bands and H-{alpha}  band respectively,
    and B(L),  A(L)  represent the corresponding counts for the lamp.  One
    might expect this ratio to be partially determined by features,  other
    than H-{alpha},  situated within the central and comparison regions of
    the stellar spectrum, but examination of a high resolution spectrogram
    of  Arcturus (a K2  giant star typical  of the stars  on the observing
    program)   taken by Griffin  (1962)  showed that  these other features
    affected  the H-{alpha}  ratio by less than 0.3%.  This is only of the
    same order as the  estimated  observational  error  in  the  H-{alpha}
    ratios,  and  we shall assume  therefore that the  H-{alpha}  ratio is
    determined solely by the strength of the H-{alpha} absorption line.

    Griffin    (1961MNRAS.122..181G)     describes    the    three-channel
    spectrophotometer with which observations were made at the coude focus
    of  the Cambridge Observatory 36 in reflecting telescope.  Griffin and
    Redman  (1960MNRAS.120..287G),   Deeming  (1960MNRAS.121...52D),   and
    Griffin  (1961MNRAS.122..181G)  describe the method of Observation and
    reduction.

File Summary:
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  FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
data.dat           76      594   Photometric Results
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Byte-by-byte Description of file: data.dat
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   Bytes Format  Units   Label    Explanations
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   1-2    A2     ---     ---      [HD]
   4-9    I6     ---     HD       HD (Cat. <III/135>) number of the star
  16-19   A4     ---     SpType   Spectral classification
  22-23   I2     ---     lum     *? Luminosity class indication
  28-29   A2     ---     HV      *[ HVP] High Velocity
  43-46   F4.2   mag     B-V     *? (B-V) color index
  49-52   F4.2   ---     Mgb     *? Mg b ratio
  55-59   F5.3   ---     NaD     *? Sodium D line ratio
  61-65   F5.3   ---     Ha       H{alpha} ratio (R{alpha})
  74-76   I3     ---     ID       [1-594]+ Star number
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Note on lum:
  10: Ia       13: Iab    14: Iab-Ib    15: Ib
  17: Ib-II    20: II     25: II-III    30: III
  35: III-IV   40: IV     45: IV-V      50: V

Note on HV:
  'HV' indicates that the star is a high velocity star with a space motion
       in excess of 63 km/s as determined by Eggen (1962RGOB...51...79E).

Note on B-V:
  from Deeming (1960MNRAS.121...52D) and Argue (1962MNRAS.125..557A)

Note on Mgb:
  measured by Deeming (1960MNRAS.121...52D)

Note on NaD:
  measured by Griffin (1961MNRAS.122..181G)
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References:
  Argue A.N., 1962, Mon. Not. R. Astron. Soc., 125, 557. (1962MNRAS.125..557A)
  Deeming T.J., 1960, Mon. Not. R. Astron. Soc., 121, 52. (1960MNRAS.121...52D)
  Eggen O.J., 1962, Roy. Obs. Bull., 51. (1962RGOB...51...79E)
  Griffin R.F., 1961, Mon. Not. R. Astron. Soc., 122, 181. (1961MNRAS.122..181G)
  Griffin R.F., 1962, private communication.
  Griffin R.F. & Redman R.O., 1959, Mon. Not. R. Astron. Soc., 120, 287.
    (1960MNRAS.120..287G)
  Peat D.W., 1964, Mon. Not. R. Astron. Soc., 128, 435 (1964MNRAS.128..435P)
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(End) Julie Anne Watko [SSDOO/ADC] May-1996, rev. F.Ochsenbein [CDS] 01-Jan-2000