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J/A+A/323/775       Cepheids radial velocities and coordinates (Mishurov+ 1997)
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Is the Sun located near the corotation circle?
       Mishurov Yu.N., Zenina I.A., Dambis A.K., Mel'nik A.M., Rastorguev A.S.
      <Astron. Astrophys. 323, 775 (1997)>
      =1997A&A...323..775M      (SIMBAD/NED BibCode)
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ADC_Keywords: Radial velocities
Keywords: Galaxy: kinematics and dynamics ; structure - Cepheids

Abstract:
    The line-of-sight velocity field of Cepheids was analysed in terms of
    a disk galaxy model perturbed by spiral density waves in order to
    estimate the parameters of the galactic rotation curve and the free
    parameters of density waves. It was shown that: 1) the Sun is located
    near the corotation circle because the angular rotation velocity of
    the Galaxy {OMEGA}_{sun}_=~26.0km/s/kpc (Kerr & Lynden-Bell,
    1986MNRAS.221.1023K; Dambis, Mel'nik & Rastorguev,
    1995AL.....21..291D) is close to that of the spiral pattern
    {OMEGA}_p_=~28.1+/-2.0km/s/kpc and the corotation radius R_c_=~7.
    2+/-1.3kpc (we adopt the galactocentric distance of the Sun
    R_{sun}_=~7.5kpc); 2) the spiral pitch angle i=~-6.8+/-0.7{deg}; 3)
    the Sun is at the spiral wave phase {chi}_{sun}_=~290+/-16{deg}; 4)
    Oort's constant A=~20.9+/-1.2km/s/kpc; the second term in the
    expansion of the galactic rotation velocity is
    R_{sun}_^{OMEGA}_{sun}_^=~13.3+/-3.1km/s/kpc^2^.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table2             72      122   Cepheids radial velocities and
                                  galactic coordinates
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Byte-by-byte Description of file: table2
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   Bytes Format Units   Label     Explanations
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   2-  4  I3    ---     No        Running number
   9- 13  A5    ---     Star      Star's name
  15- 17  A3    ---     Const     Constellation
  22- 26  F5.1  deg     GLON      Galactic longitude
  30- 34  F5.1  deg     GLAT      Galactic latitude
  38- 43  F6.4  d       Period    Pulsation period
  47- 50  F4.2  kpc     Dist      Distance of star from the Sun
  54- 58  F5.1  km/s    RV        Radial (line-of-sight) velocities of star
  61- 64  F4.1  km/s  e_RV        Standard errors of radial velocities
  69- 72  A4    ---   r_RV        References  (1)
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Note (1): Radial velocities are taken from :
          GSRS - Gorynya et al. (1996AL.....22..198G)
          DMR -  Dambis et al. (1995AL.....21..291D)
          PMB -  Pont et al. (1994A&A...285..415P)
          CC  -  Caldwell & Coulson (1987AJ.....93.1090C)
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Acknowledgements: Yu. N. Mishurov <mishurov@phys.rnd.runnet.ru>

References:
   Gorynya, N.A., Samus, N.N., Rastorguev, A.S., Sachkov, M.E.  1996,
    Astron. Letters, 22, 198.
   Dambis, A.K., Mel'nik, A.M., Rastorguev, A.S. 1995, Astronomy Letters 21, 291
   Pont F., Mayor M., Burki G. 1994, A&A 285, 415
   Caldwell, J.A.R., Coulson, I.M.  1987, AJ 93, 1090
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(End)                                         Patricia Bauer [CDS]   21-Nov-1996