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J/AJ/112/2020       UBV Photometry of globular cluster NGC1841  (Alcaino+ 1996)
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NTT photometry in UBV of the distant globular cluster NGC 1841.
     Alcaino G., Liller W., Alvarado F., Kravtsov V., Ipatov A.,
     Samus N., Smirnov O.
    <Astron. J. 112, 2020 (1996)>
    =1996AJ....112.2020A        (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, globular ; Photometry, CCD

Description:
    The observations were acquired in two nights, 1993 December 20-22,
    with the EMMI camera on the NTT telescope at ESO.
    The photometric limit is close to the cluster main-sequence turnoff;
    a comparison of the photometry with Walker (1990AJ....100.1532W)
    shows slight systematic differences . the present magnitudes being
    fainter by 0.03-0.05mag, and colors being bluer by 0.05mag.
    The estimated parameters of the populous globular cluster NGC 1841,
    located approximately 15deg from each of the Magellanic Clouds and
    probably dynamically associated with the LMC, are:
      [Fe/H]   = -2.0  +/- 0.15
      E(B-V)   =  0.17 +/- 0.03 mag
      (m-M)_0_ = 18.26 +/- 0.11 mag  (true distance modulus)


Objects:
    -----------------------------------------------------
       RA  (2000)  DE    Designation(s)
    -----------------------------------------------------
    04 45 10 -83 59.7    NGC 1841 = ESO 4-15 = C 0444+840
    -----------------------------------------------------

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table3          43       1347    The stars with photometry
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See also:
    J/PASP/104/1063 : BV Color-Magnitude Diagram for NGC 1851 (Walker 1992)
    J/AJ/105/527    : RR Lyr stars in NGC 1835 (Walker 1993)

Byte-by-byte Description of file: table3
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   Bytes Format Units   Label     Explanations
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   2-  5  I4    ---     Seq       [1/1347]+ Running number
   7- 14  F8.3  pix     x        *coordinate
  16- 22  F7.3  pix     y        *coordinate
  24- 29  F6.3  mag     Vmag      V magnitude
  31- 36  F6.3  mag     B-V       B-V color
  38- 43  F6.3  mag     U-B       ? U-B color
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Note on x, y:
     the pixel size is approximately 0.36arcsec/pix ; x is along RA and
     increases to the East; y is along Dec and increases to the South.
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Acknowledgements:
    Nikolai Samus <samus@sai.msu.su>
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(End)                                     Francois Ochsenbein [CDS]  02-Jan-1997