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J/MNRAS/367/1441      UBV(RI)cJHK photometry of NGC 2401          (Baume+, 2006)
NGC 2401: a template of the young population of the Norma-Cygnus arm in the
Third Galactic Quadrant.
    Baume G., Moitinho A., Vazquez R.A., Solivella G., Carraro G., Villanova S.
   <Mon. Not. R. Astron. Soc., 367, 1441-1449 (2006)>
   =2006MNRAS.367.1441B    (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, infrared

Keywords: stars: emission-line, Be - stars: imaging -
          stars: individual: LSS 440 -
          stars: luminosity function, mass function -
          Galaxy: open clusters and associations: individual: NGC 2401 -
          Galaxy: structure

Abstract:
    Based on a deep optical CCD (UBV(RI)_C) photometric survey and on the
    Two-Micron All-Sky-Survey (2MASS, II/246) data we derived the main
    parameters of the open cluster NGC 2401. We found this cluster is
    placed at 6.3±0.5kpc (Vo-Mv=14.0±0.2) from the Sun and is 25Myr
    old, what allows us to identify NGC 2401 as a member of the young
    population belonging to the innermost side of the extension of the
    Norma-Cygnus spiral-arm in the Third Galactic Quadrant. A
    spectroscopic study of the emission star LSS 440 that lies in the
    cluster area revealed it is a B0Ve star; however, we could not confirm
    it is a cluster member. We also constructed the cluster luminosity
    function (LF) down to V∼22 and the cluster initial mass function (IMF)
    for all stars with masses above M∼1-2M☉. It was found that the
    slope of the cluster IMF is x∼1.8±0.2. The presence of a probable
    PMS star population associated to the cluster is weakly revealed.

Description:
    Our photometric data set comes from CCD photometric observations
    carried out in the course of two runs on different telescopes:
     - The European Southern Observatory (ESO): CCD VI observations using
     the EMMI read arm camera at the NTT in the photometric night of
     December 9, 2002.
    - The Cerro Tololo Inter-American Observatory (CTIO): UBV(RI)c CCD
     data were acquired with the 0.9m telescope during an observing run in
     January 1998.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       151     3261   Photometric catalogue of the NGC 2401 region


See also:
              II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
               I/259 : The Tycho-2 Catalogue (Hog+ 2000)
 J/other/BASI/32.295 : CCD UBVRI phot. of 3 open clusters (Sujatha+, 2004)
       J/A+A/417/961 : UBV(RI)c phot. of NGC 2580 & NGC 2588 (Baume+, 2004)
       J/A+A/445/493 : UBV(RI)c phot. of NGC 2425 & NGC 2635 (Moitinho+, 2006)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     Seq       Identification number (this work)
   6- 11  F6.1  arcsec  Xpos      X position in arcseconds from the center (1)
  13- 18  F6.1  arcsec  Ypos      Y position in arcseconds from the center (1)
  20- 21  I2    h       RAh       Right Ascension (J2000)
  23- 24  I2    min     RAm       Right Ascension (J2000)
  26- 29  F4.1  s       RAs       Right Ascension (J2000)
      31  A1    ---     DE-       Declination sign (J2000)
  32- 33  I2    deg     DEd       Declination (J2000)
  35- 36  I2    arcmin  DEm       Declination (J2000)
  38- 41  F4.1  arcsec  DEs       Declination (J2000)
  43- 48  F6.3  mag     Vmag      ?=- Johnson V magnitude
  50- 54  F5.3  mag     e_Vmag    ?=- Error in Vmag
  56- 61  F6.3  mag     B-V       ?=- Johnson B-V color index
  63- 67  F5.3  mag     e_B-V     ?=- Error in B-V
  69- 74  F6.3  mag     U-B       ?=- Johnson U-B color index
  76- 80  F5.3  mag     e_U-B     ?=- Error in U-B
  82- 87  F6.3  mag     V-Rc      ?=- Johnson-Cousins V-Rc color index
  89- 93  F5.3  mag     e_V-Rc    ?=- Error in V-Rc
  95-100  F6.3  mag     V-Ic      ?=- Johnson-Cousins V-Ic color index
 102-106  F5.3  mag     e_V-Ic    ?=- Error in V-Ic
 108-113  F6.3  mag     Kmag      ?=- 2MASS K magnitude
 115-119  F5.3  mag     e_Kmag    ?=- Error in Kmag
 121-126  F6.3  mag     J-K       ?=- 2MASS J-K color index
 128-132  F5.3  mag     e_J-K     ?=- Error in J-K
 134-139  F6.3  mag     H-K       ?=- 2MASS H-K color index
 141-145  F5.3  mag     e_H-K     ?=- Error in H-K
 147-148  A2    ---     zone      Zone where star is located (2)
 150-151  A2    ---     Memb      Membership assignment (3)

Note (1): Adopted center (J2000): RA = 07:29:25.2; DE = -13:57:54.0

Note (2): Zones as follows:
           CA = cluster area
           CF = comparison field
Note (3): Membership assignment as follows:
           lm = likely member
           pm = probable member
           nm = non member


Acknowledgements: Gustavo L. Baume, gbaume(at)fcaglp.fcaglp.unlp.edu.ar
                  Andre Moitinho, andre(at)oal.ul.pt
(End)                                      Patricia Vannier [CDS]    09-Jun-2006