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J/AJ/114/1488             Globulars in M31 (Holland+ 1997)
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Deep HST V- and I-band observations of two globular clusters in the halo of M31
     Holland S., Fahlman G.G., Richer H.B.
    <Astron. J. 114, 1488 (1997)>
    =1997AJ....114.1488H
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ADC_Keywords: Clusters, globular ; Photometry
Mission_Name: HST

Abstract:
    We present deep (V=~27) V- and I-band stellar photometry of G302 and
    G312, two globular star clusters in the halo of M31. These data were
    obtained using the Hubble Space Telescope's Wide Field/Planetary
    Camera 2. We find iron abundances of [Fe/H]=-1.85+/-0.12 for G302
    and [Fe/H]=-0.56+/-0.03 for G312, consistent with spectroscopic
    measurements. The color-magnitude diagrams for each cluster show no
    evidence for an intermediate-aged population of stars, or a second
    parameter effect in the morphology of the horizontal branch. G302
    shows no evidence for a color gradient but the inner regions of G312
    are bluer than the outer regions. G312 shows no evidence of
    ellipticity or an extended halo of stars. G302 has a projected
    ellipticity of {epsilon}=0.195+/-0.012 with the projected major axis
    oriented towards the center of M31. G302 also shows evidence of an
    extended asymmetric stellar halo extending to at least twice the
    fitted Michie-King tidal radius. The amount of mass beyond the tidal
    radius of G302 is consistent with the stellar escape rates which have
    been predicted by N-body simulations of globular clusters in the
    Galactic tidal field.
    (c) 1997 American Astronomical Society.

Objects:
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       RA   (2000)   DE    Designation(s)
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    00 45 25.2 +41 05 30   G302 = SKHB 302  = Bol 240
    00 45 58.8 +40 42 32   G312 = SKHB 312  = Bol 379
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File Summary:
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 FileName  Lrecl  Records Explanations
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ReadMe        80        . This file
table3.dat    64    13321 Stellar photometry for G302 and the surrounding fields
table4.dat    64     3349 Stellar photometry for G312 and the surrounding fields
table5.dat    70      626 Stellar photometry for G302
table6.dat    70      325 Stellar Photometry for G312
tables.tex   101    17741 AASTeX version of the tables
tables.ps     72    29775 PostScript version of the tables
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Byte-by-byte Description of file: table3.dat table4.dat
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   Bytes  Format Units     Label   Explanations
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   1-  3  A3     ---       CCD     CCD the star was observed on
   7- 10  I4     ---       ID      Identification number (1)
  12- 18  F7.3   pix       Xpos    X pixel coordinate (2)
  20- 26  F7.3   pix       Ypos    Y pixel coordinate (2)
  28- 33  F6.3   mag       Vmag    V-band magnitude
  35- 39  F5.3   mag     e_Vmag    1-sigma uncertainty in Vmag
  41- 45  F5.3   ---     2_Vmag    Value of the DAOPHOT Chi statistics for Vmag
  47- 52  F6.3   mag       Imag    I-band magnitude
  54- 58  F5.3   mag     e_Imag    1-sigma uncertainty in Imag
  60- 64  F5.3   ---     2_Imag    Value of the DAOPHOT Chi statistics for Imag
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Note (1): Identification numbers are only unique for stars on a given CCD.
Note (2): 1 pix = 0.1".
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Byte-by-byte Description of file: table5.dat table6.dat
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   Bytes  Format Units     Label   Explanations
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   1-  3  A3     ---       CCD     CCD the star was observed on
   7- 10  I4     ---       ID      Identification number
  12- 18  F7.3   pix       Xpos    X pixel coordinate (1)
  20- 26  F7.3   pix       Ypos    Y pixel coordinate (1)
  28- 32  F5.3   arcsec    Dist    Distance of star from cluster center
  34- 39  F6.3   mag       Vmag    V-band magnitude
  41- 45  F5.3   mag     e_Vmag    1-sigma uncertainty in Vmag
  47- 51  F5.3   ---     2_Vmag    Value of the DAOPHOT Chi statistics for Vmag
  53- 58  F6.3   mag       Imag    I-band magnitude
  60- 64  F5.3   mag     e_Imag    1-sigma uncertainty in Imag
  66- 70  F5.3   ---     2_Imag    Value of the DAOPHOT Chi statistics for Imag
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Note (1): 1 pix = 0.1".
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Origin: AAS CD-ROM series, Volume 9, 1997         Lee Brotzman [ADS] 04-Nov-1997
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(End)                                                         [CDS]  05-Feb-1998