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J/MNRAS/402/1380 Rotation velocities in Pleiades and αPer (Jackson+, 2010)
Are the spin axes of stars randomly aligned within a cluster ?
    Jackson R.J., Jeffries R.D.
   <Mon. Not. R. Astron. Soc., 402, 1380-1390 (2010)>
   =2010MNRAS.402.1380J
ADC_Keywords: Clusters, open ; Rotational velocities

Keywords: methods: statistical - stars: formation -
          open clusters and associations: individual: Pleiades -
          open clusters and associations: individual: alpha Per

Abstract:
    We investigate to what extent the spin axes of stars in young open
    clusters are aligned. Assuming that the spin vectors lie uniformly
    within a conical section, with an opening half-angle between
    λ=0° (perfectly aligned) and λ=90° (completely
    random), we describe a Monte Carlo modelling technique that returns a
    probability density for this opening angle given a set of measured
    sini values, where i is the unknown inclination angle between a
    stellar spin vector and the line of sight.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        60       82  *Estimated values of sini for stars in the
                             Pleiades and α Per clusters

Note on table3.dat : using the Barnes-Evans relation in equation (11), a
     mean distance of 131.8±2.4pc and a colour excess of 0.032 for the
     Pleiades and a distance of 176.2±4.9pc  and a colour excess of 0.10
     for the α Per cluster.


See also:
   J/A+A/320/74  : Radial velocities of Pleiades members (Mermilliod+ 1997)
   J/A+A/323/139 : K magnitude of Pleiades low-mass binaries (Bouvier+ 1997)
   J/A+A/335/183 : Pleiades low-mass stars rotational velocities (Queloz+ 1998)
   J/A+A/416/125 : RI photometry in α Per and Pleiades (Deacon+, 2004)
   J/A+A/488/409 : Radial velocities of α Per stars (Mermilliod+, 2008)


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

   Bytes Format Units   Label   Explanations

   1-  7  A7    --      Star    Star name
   9- 14  F6.3  d       Per     Rotation (spin) period
      16  A1    ---     r_Per   Period reference (1)
  18- 22  F5.1  km/s    vsini   Rotational velocity
      24  A1    ---    r_vsini  Rotational velocity reference (1)
  26- 30  F5.2  mag     Vmag    Mean apparent V magnitude
  32- 36  F5.2  mag     Kmag    Mean apparent 2MASS K magnitude
  38- 41  F4.2  mag     V-K     V-K(CIT) colour index (2)
  43- 46  F4.2  mag     Vamp    Amplitude of the light curve modulation in V
  48- 52  F5.3  arcsec  Diam    Estimated stellar diameter
  54- 57  F4.2  ---     sini    Estimate of sini
  59- 60  A2    --      bin     [*] ** for stars identified as probable binaries
                                       and excluded from the analysis of the
                                       sini distribution

Note (1): References as follows:
      a = Krishnamurthi et al. (1998ApJ...493..914K)
      b = Marilli, Catalano & Frasca (1997MmSAI..68..895M)
      c = Prosser et al. (1995PASP..107..211P)
      d = Prosser et al. (1993PASP..105..269P)
      e = Messina (2001A&A...371.1024M)
      f = Queloz et al. (1998, Cat. J/A/A/335/183)
      h = Stauffer & Hartmann (1987ApJ...318..337S)
      i = Soderblom et al. (1993, Cat. J/ApJS/85/315)
      j = Stauffer et al. (1989ApJ...346..160S)
      k = Stauffer et al. (1985ApJ...289..247S)
      l = Prosser et al. (1993PASP..105..269P)
      m = Prosser & Gramkin (1993, CFA Prerints Ser. 4539, 376, 1109)
      n = Bouvier (1996, Cat. J/A+AS/120/127)
      p = O'Dell et al. (1994MNRAS.268..181O)
Note (2): K(CIT)=K(2MASS)+ 0.024



Acknowledgements:
    Richard Jackson, rjj(at)astro.keele.ac.uk>
(End)                                      Patricia Vannier [CDS]    19-Jul-2010