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J/A+AS/119/499      NGC 628 and companions photometric distances (Sharina+ 1996)
Photometric distances to NGC 628 and its four companions
       Sharina M.E., Karachentsev I.D., Tikhonov N.A.
      <Astron. Astrophys. Suppl. Ser. 119, 499 (1996)>
      =1996A&AS..119..499S      (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Redshifts

Keywords: galaxies: NGC 628; distances and redshifts; irregular


Description:
    Based on photometry of the brightest blue stars we derived distance
    moduli for NGC 628 and its dwarf irregular companions: DDO 13, UGC
    1171, UGC 1104, and K 10. The mean modulus of the group is estimated
    to be 29.46 mag with a formal (internal) error of 0.11. The total mass
    to luminosity ratio of 40M☉/L☉ seems sufficient for NGC
    628 to keep its companions in bound orbits.
Objects:
    -----------------------------------------
       RA   (2000)   DE    Designation(s)
    -----------------------------------------
     01 36.7      +15 47   NGC 628
     01 40.15     +15 56   DDO 13
     01 39.7      +15 54   UGC 1171
     01 32.7      +18 19   UGC 1104
     01 43.3      +19 59   UGCA 20
     01 43.0      +13 38   NGC 660
     01 43.7      +15 40   K68 10
    -----------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        42       98   CCD photometry of the brightest stars in NGC628
table2.dat        27        8   Photometry of stars in NGC628
table3.dat        27        6   Photometry of stars in DDO 13
table4.dat        27        5   Photometry of stars in UGC 1171
table5.dat        27        7   Photometry of stars in UGC 1104
table6.dat        27        3   Photometry of stars in K68 10
table7.dat        27        3   Brightest stars in UGCA 20
table8.dat        59        9   Properties of the galaxies around NGC 628
table9.dat        50        8   NGC 628 and NGC 660 with their companions


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

   Bytes Format Units   Label     Explanations

   1-  6  A6    ---     Numb.     Star number
   9- 11  I3    pix     Xpos      Rectangular coordinates of stars
  15- 17  I3    pix     Ypos      Rectangular coordinates of stars
  22- 26  F5.2  mag     Vmag      V magnitude
  31- 35  F5.2  mag     B-V       (B-V) colour index
  38- 42  A5    ---     Notes     By the letter "D" we indicate the cases
                                   when an object image appears diffuse.


Byte-by-byte Description of file: table[234567].dat

   Bytes Format Units   Label     Explanations

   1-  5  A5    ---     Star      Star number
   7- 11  F5.2  mag     Bmag      B magnitude
      12  A1    ---     u_Bmag    Uncertainty flag on B
  16- 20  F5.2  mag     Vmag      V magnitude
  23- 27  F5.2  mag     Rmag      ? R magnitude


Byte-by-byte Description of file: table8.dat

   Bytes Format Units   Label     Explanations

   1-  7  A7    ---     Galaxy    Galaxy name
  10- 11  I2    ---     MType     Morphological type
  13- 17  F5.1  arcmin  a         Standard angular diameter
  19- 23  F5.2  ---     b/a       Apparent axis ratio
  26- 30  F5.2  mag     Bt        Total blue magnitude
  32- 36  F5.2  mag     (B-V)0    ? Colour corrected for galactic extinction
  39- 41  I3    km/s    RVm       Measured radial velocity
  44- 46  I3    km/s    W50       ? HI line width measured at 50% level of
                                     maximum
  49- 52  I4    km/s    RVc       Radial velocity corrected for the Sun motion
                                   with respect to the Local Group centroid
  55- 59  F5.2  Mpc     Dist      ? Measured distance


Byte-by-byte Description of file: table9.dat

   Bytes Format    Units    Label     Explanations

   1-  7  A7       ---      Galaxy    Galaxy name
   9- 13  F5.1     kpc      A25       Standard linear diameter
  15- 19  F5.1     Sun      (M/L)k    Mass to luminosity ratio
  22- 26  F5.2 10+10solMass Mk        Mass of the galaxy
  29- 32  F4.0     km/s     V1-Vk     Velocity of the main galaxy minus velocity
                                       of its companion
  35- 38  F4.0     kpc      R1k       Projection of the linear separation
                                       between the galaxies
  40- 44  F5.2     ---      g1k       Dimensionless potential factor
  46- 50  F5.2     ---      t1k       Cyclic orbital period of the companion
                                       measured in 1/H


Acknowledgements: Igor D.Karachentsev 

(End)                                         Patricia Bauer [CDS]   06-May-1996