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J/AJ/122/248          h and chi Per UBVI,H{alpha} photometry     (Keller+, 2001)
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UBVI and H{alpha} photometry of the h and {chi} Persei cluster.
    Keller S.C., Grebel E.K., Miller G.J., Yoss K.M.
   <Astron. J. 122, 248 (2001)>
   =2001AJ....122..248K
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ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, H-alpha ;
              Stars, Be
Keywords: open clusters and associations: individual (NGC 869, NGC 884) -
          stars: emission-line, Be - stars: evolution - techniques: photometric

Abstract:
    UBVI and H{alpha} photometry is presented for 17319 stars in vicinity
    of the young double cluster h and {chi} Persei. Our photometry extends
    over a 37'x1{deg} field centered on the association. We construct
    reddening contours within the imaged field. We find that the two
    clusters share a common distance modulus of 11.75+/-0.05 and ages of
    log[age(yr)]=7.1+/-0.1. From the V-H{alpha} color, a measure of the
    H{alpha} emission strength, we conduct a survey for emission line
    objects within the association. We detect a sample of 33 Be stars,
    eight of which are new detections. We present a scenario of
    evolutionary enhancement of the Be phenomenon to account for the peak
    in Be fraction toward the top of the main sequence in the population
    of h and {chi} Persei and similar young clusters.
    UBVI and H{alpha} photometry was performed on five nights between 1999
    August 17 and 25 at the San Diego State University Mount Laguna
    Observatory with the 1m telescope and a Loral 2048x2048 CCD.

Objects:
    -----------------------------------------
       RA  (2000)  DE      Designation(s)
    -----------------------------------------
    02 22 24    +57 07.0   NGC 884
    02 19 00    +57 09.0   NGC 869
    -----------------------------------------

File Summary:
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 FileName  Lrecl  Records  Explanations
--------------------------------------------------------------------------------
ReadMe        80        .  This file
table1.dat   100        5  Atmospheric extinction coefficients and photometric
                            zero points from the present study
table2.dat    74    17315  Photometric data
table4.dat    74       33  Be stars detected within the field of h and {chi} Per
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See also:
    J/A+A/372/477  : ubvy{beta} photometry of h + chi Persei (Marco+, 2001)
    J/A+AS/119/271 : Be stars uvby{beta} photometry (Fabregat+, 1996)

Byte-by-byte Description of file: table1.dat
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   Bytes Format Units        Label  Explanations
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   1- 10  A10 "YYYY/MM/DD"  Date   Observation date
  12- 16  F5.3  mag         k1,V   Atmospheric extinction coefficient in V band
  18- 22  F5.3  mag       e_k1,V   rms uncertainty on k1,V
  24- 28  F5.3  mag         k1,B   Atmospheric extinction coefficient in B band
  30- 34  F5.3  mag       e_k1,B   rms uncertainty on k1,B
  36- 39  F4.2  mag         k1,U   Atmospheric extinction coefficient in U band
  41- 44  F4.2  mag       e_k1,U   rms uncertainty on k1,U
  46- 50  F5.3  mag         K1,I   Atmospheric extinction coefficient in I band
  52- 56  F5.3  mag       e_K1,I   rms uncertainty on k1,I
  58- 62  F5.3  mag         ksiV   Photometric zero point in V band
  64- 68  F5.3  mag       e_ksiV   rms uncertainty on ksiV
  70- 74  F5.3  mag         ksiB   Photometric zero point in B band
  76- 80  F5.3  mag       e_ksiB   rms uncertainty on ksiB
  82- 85  F4.2  mag         ksiU   Photometric zero point in U band
  87- 90  F4.2  mag       e_ksiU   rms uncertainty on ksiU
  92- 96  F5.3  mag         ksiI   Photometric zero point in I band
  97-100  F4.2  mag       e_ksiI   rms uncertainty on ksiI
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Byte-by-byte Description of file: table2.dat table4.dat
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   Bytes Format Units   Label     Explanations
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   1-  5  I5    ---     [KGM2001] Identification number
   7- 15  F9.3  pix     Xpix      X pixel position (1)
  17- 25  F9.3  pix     Ypix      Y pixel position (1)
  28- 33  F6.3  mag     Vmag      The V-band magnitude
  36- 41  F6.3  mag     U-B       The U-B color
  44- 49  F6.3  mag     B-V       The B-V color
  52- 57  F6.3  mag     V-I       The V-I color
  60- 65  F6.3  mag     V-Ha      The V-H{alpha} color
  67- 68  A2    ---     Be        [Be] Be: Be star
  71- 74  I4    ---     Oos       ? The Oosterhoff (1937AnLei..17a...1O)
                                     identification number (2)
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Note (1): The scale is 1 pix = 0.399"
Note (2): Identifications:
      NGC 869 NNNN (for Nos 1-1640, 4000-4090), h Per
      NGC 884 NNNN (for Nos 1641-2987, 7001-7125), chi Per
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History:
    From electronic version of the journal
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(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    14-Jan-2002