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J/MNRAS/358/66      uvbyβ photometry of NGC 663         (Fabregat+, 2005)
CCD uvbyβ photometry of the young open cluster NGC 663.
    Fabregat J., Capilla G.
   <Mon. Not. R. Astron. Soc., 358, 66-70 (2005)>
   =2005MNRAS.358...66F
ADC_Keywords: Clusters, open; Photometry, CCD; Photometry, H-beta;
              Photometry, uvby; Stars, Be; Stars, B-type
Keywords: techniques: photometric - stars: emission-line, Be -
          Hertzsprung-Russell (HR) diagram -
          open clusters and associations: individual: NGC 663

Abstract:
    We present CCD uvbyβ photometry for stars in the central area of
    the young open cluster NGC 663. We find that the reddening is highly
    variable, with values ranging from E(b-y)=0.639±0.032 in the
    central part to E(b-y)=0.555±0.038 in the south-east. The distance
    modulus is found to be 11.6±0.1mag. (2.1kpc), and the age
    logt=7.25±0.1 years (25+7/-5Myr).

Description:
    CCD photometry of NGC 663 was obtained on the nights of 1998 November
    20-22 at the 1.52-m telescope of the Observatorio Astronomico
    Nacional, located at the Calar Alto Observatory (Almeria, Spain).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       119      290   Coordinates and photometry for stars in NGC 663


See also:
  J/A+AS/119/271 : Be stars uvbyβ photometry  (Fabregat+, 1996)
  J/A+A/394/479  : uvbyβ photometry of h and chi Per (Capilla+, 2002)


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   2-  5  I4    ---     Star      Star number, NGC 663 NNNN in Simbad
   8-  9  I2    h       RAh       Right Ascension J2000 (hours)
  11- 12  I2    min     RAm       Right Ascension J2000 (minutes)
  14- 19  F6.3  s       RAs       Right Ascension J2000 (seconds)
      21  A1    ---     DE-       Declination J2000 (sign)
  22- 23  I2    deg     DEd       Declination J2000 (degrees)
  25- 26  I2    arcmin  DEm       Declination J2000 (minutes)
  28- 32  F5.2  arcsec  DEs       Declination J2000 (seconds)
  37- 42  F6.3  mag     Vmag      Johnson V magnitude
  44- 49  F6.3  mag     b-y       b-y color index
  51- 56  F6.3  mag     m1        m1 index
  58- 63  F6.3  mag     c1        c1 index
  66- 71  F6.3  mag     e_Vmag    ?=99.999 rms uncertainty on Vmag (1)
  73- 78  F6.3  mag     e_b-y     ?=99.999 rms uncertainty on b-y (1)
  80- 85  F6.3  mag     e_m1      ?=99.999 rms uncertainty on m1 (1)
  87- 92  F6.3  mag     e_c1      ?=99.999 rms uncertainty on c1 (1)
      95  I1    ---     o_Vmag    number of uvby measurements
  98-103  F6.3  mag     Hbeta     ?=99.999 beta index (1)
 106-111  F6.3  mag     e_Hbeta   ?=99.999 rms uncertainty on Hbeta (1)
     114  I1    ---     o_Hbeta   number of Hbeta measurements
     117  I1    ---     Member    [0/1] Membership (0: nonmember, 1: member)

Note (1): 99.999 in any field indicates that no data is available.



Nomenclature Notes:
    The cluster star numbering system is adopted from the WEBDA database
    (http://obswww.unige.ch/webda). Numbers lower than 635 coincide with
    Wallenquist (1929MeUpp..42.....W) numbering, NGC 663 NNN in Simbad

Acknowledgements: Juan Fabregat, juan.fabregat(at)uv.es

(End)                                      Patricia Vannier [CDS]    18-Mar-2005