J/MNRAS/423/2966   Low-mass stars spectroscopy in NGC 2516     (Jackson+, 2012)
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Why do some young cool stars show spot modulation while others do not?
    Jackson R.J., Jeffries R.D.
   <Mon. Not. R. Astron. Soc., 423, 2966-2976 (2012)>
   =2012MNRAS.423.2966J
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ADC_Keywords: Clusters, open ; Photometry ; Radial velocities ;
              Equivalent widths
Keywords: stars: low-mass - stars: magnetic field - stars: rotation -
          open clusters and associations: individual: NGC 2516

Abstract:
    We present far-red, intermediate-resolution spectroscopy of 572
    photometrically selected, low-mass stars (0.2<M/M_{sun}_<0.7) in the
    young open cluster NGC 2516, using the FLAMES spectrograph at the Very
    Large Telescope. Precise radial velocities confirm membership for 210
    stars that have published rotation periods from spot-modulated light
    curves and for another 144 stars in which periodic modulation could
    not be found. The two subsamples are compared and no significant
    differences are found between their positions in colour-magnitude
    diagrams, the distribution of their projected equatorial velocities or
    their levels of chromospheric activity.

Description:
    Targets for our spectroscopic survey were selected from Irwin et al.
    (2007, Cat. J/MNRAS/377/741) with 14<I<19. They were observed using
    the European Southern Observatory (ESO) 8.2-m aperture Very Large
    Telescope (UT-2 Kueyen) FLAMES fibre instrument, feeding the GIRAFFE
    and UVES spectrographs. Multiple targets were observed with GIRAFFE in
    eight separate fibre configurations.

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
table3.dat     96      572   Velocity data measured for targets in NGC 2516
table4.dat     90      572   Chromospheric activity indices and related data
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See also:
    J/MNRAS/377/741 : VIc photometry of NGC 2516 (Irwin+, 2007)

Byte-by-byte Description of file: table3.dat
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   Bytes Format Units   Label     Explanations
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   1-  6  A6    ---     ---       [N2516-]
   7- 14  A8    ---    [IHA2007]  Identification number, N-N-NNNN,
                                  <[IHA2007] 2516-N-N-NNNN> in Simbad
      17  I1    h       RAh       Right ascension (J2000)
  19- 20  I2    min     RAm       Right ascension (J2000)
  22- 26  F5.2  s       RAs       Right ascension (J2000)
      28  A1    ---     DE-       Declination sign (J2000)
  29- 30  I2    deg     DEd       Declination (J2000)
  32- 33  I2    arcmin  DEm       Declination (J2000)
  35- 39  F5.2  arcsec  DEs       Declination (J2000)
  41- 46  F6.3  d       Per       ?=- Modulation period
  48- 52  F5.2  mag     Vmag      V magnitude
  54- 58  F5.2  mag     Icmag     Cousins C magnitude
  60- 64  F5.2  mag     Kmag      ?=- CIT K magnitude (1)
  66- 67  I2    ---     SNR       Signal-to-noise ratio
  69- 74  F6.2  km/s    RV        Radial velocity
  76- 79  F4.1  km/s  e_RV        rms uncertainty on RV
      81  A1    ---   l_vsini     Limit flag on vsini
  82- 86  F5.1  km/s    vsini     Rotational velocity
  88- 90  F3.1  km/s  e_vsini     ?=- rms uncertainty on vsini
  92- 94  A3    ---     Run       Run number(s)
      96  A1    ---     Mm        [*] * for non-members
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Note (1): K magnitudes from the 2MASS transformed to the CIT system
   using K(CIT)=K(2MASS)+0.024. For the sources N2516-1-4-4069, 
   N2516-2-2-1247, N2516-2-2-19, N2516-2-3-1199, N2516-3-1-2708 and 
   N2516-3-7-689, original value was .020, transformed into ---.
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Byte-by-byte Description of file: table4.dat
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   Bytes Format Units   Label     Explanations
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   1-  6  A6    ---     ---       [N2516-]
   7- 14  A8    ---    [IHA2007]  Identification number, N-N-NNNN,
                                  <[IHA2007] 2516-N-N-NNNN> in Simbad
  16- 20  F5.2  [Lsun]  logL      Luminosity
  22- 27  F6.3  d       Per       ?=- Modulation period
  29- 33  F5.3  mag     amp       ?=- sine amplitude (light curve amplitude)
  35- 37  I3    d       tc        Convective turn-over time {tau}_c_
  39- 43  F5.2  [-]     logR      ?=- Rossby number
  45- 49  F5.2  0.1nm   W(Ca)1    Ca 8498{AA} equivalent width
  51- 54  F4.2  0.1nm e_W(Ca)1    rms uncertainty on W(Ca)1
  56- 60  F5.2  0.1nm   W(Ca)2    Ca 8542{AA} equivalent width
  62- 65  F4.2  0.1nm e_W(Ca)2    rms uncertainty on W(Ca)2
  67- 71  F5.2  [-]     logR'1    ?=- Activity index from Ca8488
  73- 75  F3.2  [-]   e_logR'1    ?=- rms uncertainty on logR'1
  77- 81  F5.2  [-]     logR'2    ?=- Activity index from Ca8542
  83- 85  F3.2  [-]   e_logR'2    ?=- rms uncertainty on logR'2
  87- 90  F4.2  Msun    Mass       Mass
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History:
    From electronic version of the journal

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(End)                                      Patricia Vannier [CDS]    04-Apr-2013