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J/A+A/371/908       Havlen-Moffat No. 1 UBVRI photometry     (Vazquez+, 2001)
The open cluster Havlen-Mofat No. 1 revisited
    Vazquez R.A., Baume G.
   <Astron. Astrophys. 371, 908 (2001)>
   =2001A&A...371..908V
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; MK spectral classification

Keywords: cluster: open - individual: Havlen-Mofat No. 1 - stars: imaging -
          stars: luminosity function, mass function - ISM: dust, extinction

Description:
    A deep CCD UBVRI photometric survey combined with UBVRI polarimetric
    observations of 21 bright stars was carried out in the region of the
    open cluster Havlen-Moffat No. 1. Our data reveal that the extinction
    law in this cluster es variable and that six cluster stars show very
    high polarisation values (>4%), probably because of the presence of a
    nearby small dust cloud.
    The cluster is at a distance of d=3300pc, it is 2-4Myr old and the
    initial mass function of its most massive stars (M>3M☉) has a flat
    slope of x about of 0.7. As an additional result, it was possible to
    reconcile the absolute magnitudes of the two WN7-type members using
    the R-values valid in the regions where they are located.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
stars.dat         49       15   Star positions (from Simbad)
table1.dat        95      802   Photometric catalogue of the HM1 region


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

   Bytes Format Units   Label    Explanations

   2-  4  I3    ---     Seq      Sequence number
   7-  8  I2    h       RAh      Right ascension (J2000)
  10- 11  I2    min     RAm      Right ascension (J2000)
  13- 16  F4.1  s       RAs      Right ascension (J2000)
      18  A1    ---     DE-      Declination sign (J2000)
  19- 20  I2    deg     DEd      Declination (J2000)
  22- 23  I2    arcmin  DEm      Declination (J2000)
  25- 26  I2    arcsec  DEs      Declination (J2000)
  30- 31  I2    ---     HM1      Identification number in Havlen & Moffat,
                                  1977A&A....58..351H (Cl HM 1 NN)
  33- 36  I4    ---     LSS      ? Stephenson & Sanduleak, Cat. III/43, number
  38- 48  A11   ---     Name     Other name


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

   Bytes Format Units   Label     Explanations

   2-  4  I3    ---     Seq       Sequence number
   7-  9  I3    ---     HM1       ? Identification number of Havlen & Moffat,
                                1977A&A....58..351H and The et al.,
                                1982ApL....22..109T (Cl HM 1 NNN in Simbad)
  12- 17  F6.1  pix     Xpos      X position (1)
  20- 25  F6.1  pix     Ypos      Y position (1)
  29- 33  F5.2  mag     Vmag      ? V magnitude
  35- 36  A2    ---     u_Vmag    [: ] uncertainty flag on Vmag (2)
  38- 42  F5.2  mag     B-V       B-V color
  44- 45  A2    ---     u_B-V     [: ] uncertainty flag on B-V (2)
  47- 51  F5.2  mag     U-B       []? U-B color
  53- 54  A2    ---     u_U-B     [: ] uncertainty flag on U-B (2)
  56- 60  F5.2  mag     V-R       []? V-R color
  62- 63  A2    ---     u_V-R     [: ] uncertainty flag on V-R (2)
  65- 69  F5.2  mag     V-I       []? V-I color
  71- 72  A2    ---     u_V-I     [: ] uncertainty flag on V-I (2)
  74- 77  I4    ---     LSS       ? LSS number
  82- 86  A5    ---     SpType    Spectral Type
  89- 91  A3    ---     r_SpType  Spectral Type source (3)
      95  A1    ---     Note      [*] Note (4)

Note (1): Origin: X, Y = 0.00; 0.00 ⟹ RA=17:19:36 (2000) DE=-38:51:49
          Orientation: ascending Y --> North
                       ascending X --> West
          Scale: 1 pixel = 0.45 arcsec
Note (2):  (:) errors larger than 0.04mag
          (::) errors larger than 0.08mag
Note (3): the source are
      1 for spectral type from Havlen & Moffat, 1977A&A....58..351H
      2 for spectral type from Walborn & Fitzpatrick (2000PASP..112...50W)
Note (4): the * indicates stars that has a companion star
    - star 2  companion is star (14) at 4".
      Integrated V = 11.16 in coincidence with Havlen & Moffat,
      1977A&A....58..351H
    - star 10 companion is star (87) at 3.9".
      Integrated V = 13.61 against 13.64 from Havlen & Moffat,
      1977A&A....58..351H
    - star 22 companion is star (102) at 7.8".
      Integrated V = 14.57 against 14.58 from Havlen & Moffat,
      1977A&A....58..351H


Acknowledgements: Ruben Vazquez 

(End)                                          Patricia Bauer [CDS]  09-May-2001