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J/AN/325/307  UBVIc photometry of NGC 3077 center      (Notni+, 2004)
The central region of NGC 3077: ground-based photometry and age of
bright `starlike' objects.
    Notni P., Karachentsev I.D., Makarova L.N.
   <Astron. Nachr., 325, 307-316 (2004)>
   =2004AN....325..307N
ADC_Keywords: Galaxies, photometry ; Photometry, UBVRI ; Photometry, Cousins

Keywords: galaxies: dwarfs (NGC 3077) - galaxies: stellar photometry -
          galaxies: stellar content

Abstract:
    We present UBVIc photometry of starlike objects in the central region
    of NGC 3077. The colour-colour and colour-magnitude diagrams of the
    objects are discussed. Many of the objects under consideration,
    starlike from the ground, are probably dense young star clusters
    (super star clusters, SSC). Ages spreading over ∼4 to ∼150Myr are
    estimated for most of these objects. Sakai and Madore
    (2001ApJ...555..280S) found enhanced star formation ∼30-125Myr ago
    also in the halo of this galaxy; thus, high star forming activity has
    occurred within the entire galaxy (centre and halo) since
    ∼130..150Myr. Having ended in the outer regions about 30Myr ago, it is
    going on near the centre with full vigour.

Description:
    CCD images of NGC 3077 were obtained in 3 runs: at the primary focus
    of the 6m-telescope of the Special Astrophysical Observatory (Russian
    Academy of Sciences) in 1993 and 1006, and an additional one at the
    1.23m-telescope of the German-Spanish Observatory on Calar Alto, in
    1995. Two frames were taken in each band in each run.
Objects:
    -----------------------------------------------
       RA   (2000)   DE      Designation(s)
    -----------------------------------------------
    10 03 20.0   +68 44 02   NGC 3077 = UGC 5398
    -----------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        77      124   UBVIc photometry of bright starlike objects
                             in NGC 3077


Table 1: Log of observations.
-------------------------------------------------------------------------
 Date   Observatory   CCD      Scale      Field  Filter  Seeing  radius
         Telescope   pixel   arcsec/pix   arcsec         FWHM,"  arcsec
-------------------------------------------------------------------------
 1993   SAO 6m      520x 580  0.15x0.20  80x120    VI     1.2     1.0
 1993   SAO 6m      520x 580    0.274   140x160   BVI     1.5     1.4
 1995   CA 1.23m    960x1024    0.5     480x512  UBVI     1.4     2.0

Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---    [NKM2004]  [1/124] Sequential number
   5- 10  F6.1  pix     Xpos      X position (1)
  12- 17  F6.1  pix     Ypos      Y position (1)
  19- 23  F5.1  s       oRA       Offset in right ascension (2)
  25- 27  I3    arcsec  oDE       Offset in declination (2)
  29- 31  I3    arcsec  R         Distance from dynamical centre at
                                   X=224.6,Y=107.7 (Price & Gullixson,
                                   1989ApJ...337..658P)
  33- 37  F5.2  mag     Vmag      V magnitude
  39- 43  F5.2  mag     B-V       ?=- B-V colour index
  45- 49  F5.2  mag     V-Ic      ?=- V-Ic colour index
  51- 55  F5.2  mag     U-B       ?=- U-B colour index
  57- 58  I2    ---     qB        ?=- Quality measure on B band
  60- 61  I2    ---     qV        ?=- Quality measure on V band
  63- 64  I2    ---     qIc       ?=- Quality measure on Ic band
  66- 67  I2    ---     qU        ?=- Quality measure on U band
  69- 70  A2    ---     Frame     [ca CA --] Frame (3)
      72  A1    ---     [BBD74]   [a-m] Designation by Barbieri et al.,
                                   1974A&A....35..463B, [BBD74] Blue a in Simbad
  75- 77  A3    ---     MType     Morphology from HST frame (5)

Note (1): X, Y rectangular coordinates on SAO 1996 frame, in pixel,
          1 pix = 0.274 arcsec, X points to p.a. 26.4deg, Y to 116.4
Note (2): Equatorial coordinates, referred to
          RA=10h02min, DE=+68°40' (2000)
Note (3): Frames as follows:
     CA = measurement on Calar Alto frames only
     ca = Calar Alto measurement included
Note (5): Morphology from HST frame as follows:
      s = single (dominant) star
     2s = 2 dominant stars
     sd = diffuse star
    sdg = diffuse star in group
    sgr = dominant star in (loose) group
    scl = dominant star in a `cloud'
     gr = group of stars of comparable brightness
     cl = stellar cloud (very loose group)
     gc = concentrated group or Super star cluster
      d = diffuse
      - = unconspicious fluctuation
    gal = background galaxy


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    16-Sep-2005