'UNKNOWN' SPECTRA
The following is a list of the 'unknown' spectrum plots in this directory.

The header of an 'unknown' plot will give a name for that star and date of observation.
In some cases the 'unknown' is also on the standards list, but a night different than the standards spectrum, and with an alternate name for the star.
The K stars among these will be harder to classify than the others because of the shortage of K and late G standards.

  Catalog abbreviations:
  AMMT   Abt Meinel Morgan Tapscott An Atlas of Low Dispersion Grating Stellar Spectra
  C+J      Cowley & Jaschek AJ 74, 375 1969
  GGv69   Gray & Garrison ApJSup 69, 301
  GGv70   Gray & Garrison ApJSup 70, 626
  KM       Keenan & McNeil An Atlas of Spectra of the Cooler Stars
  KM2       Keenan & McNeil ApJSup 71, 245 1989
  KY        Keenan & Yorka BICDS 29, 25 1985
  L           Lesh ApJSupp 17, 371
  MAT     Morgan Abt Tapscott Revised MK Spectral Atlas for Stars Earlier than the Sun
  W         Walborn ApJSupp 23, 257
  Y          Yamashita, Nariai, Norimoto An Atlas of Representative Stellar Spectra


'UNKNOWNS'

Some spectra with ID to show more examples of spectrum quality, or for classroom classification practice; and some spectra without ID given.

  Xi²Cet    B9III C+J This is a spectroscopic binary.

   HR21 = HD432 = Beta Cas    F2III-IV MAT standard.
A different night than the standards plot

  Beta Ari   A5V This is a spectroscopic binary.

  HD76510   B1Ib

  Eta Hya     B3V is the general consensus, but L likes B4V

   HR4295 = HD95418 = Beta UMa   A1V   A different observation of the standard star.
Could use it as an unknown, or to see what the noise level is in a typical well observed spectrum of a bright star.

  Gamma Boo     A7III is the usual classification; AJ 121, 2148 says A7IV+(n),
making a careful subtle distinction between IV & III.

  HR5062 = 80UMa   F1V standard, A different observation than the standards plot

   HD149757 = Zeta Oph   O9.5V

  HD204827    O9.5V Weaver & Torres-Dodgen ApJ 487,847 1997
Others have called it B0V
Note that this star is relatively faint (8.00 V, 8.69 B), so the spectrm is noisy,
and reddened, so the spectrum is flatter than the standards of the same spectral type.

   Zeta Peg      B8V

   2 And      A3Vn C+J

  HD7902     B6Ib

  HD188500    

  HD190025

  HD23603

  HD115136  

The following spectra are noisier than those above; the stars are faint:

  HD25992    about K0III; the photographic spectra used to determine
this are lower dispersion than usual, so this type is less certain than the others here

  HD95803    K2III

  LSI+61 325   This star is so faint that it was observed at WIYN, not PBO; Significant reddening

  BD +62 657   Significant reddening

  BD+68 719

Anonymous:   Spectra without ID in the header, for classroom use.
  anonymous#1
  anonymous#2
  anonymous#3
  anonymous#4
  anonymous#5
  anonymous#6
  anonymous#7
  anonymous#8
  anonymous#9
  anonymous#10
  anonymous#11
  anonymous#12
  anonymous#13

The following are real unknowns: the readout of the telescope pointing coordinates can
become inaccurate; when that happens the star observed is sometimes not the star intended,
and which star was actually observed cannot be definitely determined (though there
can be a strong suspicion of what it was). Some of these are fairly noisy spectra
(the observed star was fainter than the target star, for which the exposure time was set).

  unknown1   040127
  unknown2   950309
  unknown3   950309
  unknown4   970327
  unknown5   040208 probably 4 Canis Minoris
  unknown6   001104 probably HD4142
  unknown7   030909
  unknown8   000715
  unknown9   031008