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J/A+A/539/A64       X-ray data for IC 348 young stars         (Alexander+, 2012)
X-ray activity and rotation of the young stars in IC 348.
    Alexander F., Preibisch T.
   <Astron. Astrophys., 539, A64 (2012)>
   =2012A&A...539A..64A
ADC_Keywords: Associations, stellar ; Stars, pre-main sequence ; X-ray sources

Keywords: circumstellar matter - stars: pre-main sequence - stars: activity -
          stars: magnetic field

Abstract:
    The physical origin of the strong magnetic activity in T Tauri stars
    and its relation to stellar rotation is not yet well-understood.

    We investigate the relation between the X-ray activity, rotation, and
    Rossby number for a sample of young stars in the ∼3Myr old cluster
    IC 348.

    We use the data of four Chandra observations of IC 348 to derive the
    X-ray luminosities of the young stars. Basic stellar parameters and
    rotation rates are collected from the literature. This results in a
    sample of 82 X-ray detected stars with known rotation periods. We
    determine the Rossby numbers (i.e. the ratio of rotation period to
    convective turnover time) of 76 of these stars from stellar structure-
    and evolution-models for pre-main sequence stars.

Description:
    We targeted IC 348 during four different observations with the
    Imaging Array of the Chandra Advanced CCD Imaging Spectrometer
    (ACIS-I). The first observation was obtained in September 2000 (ObsID
    606, 52.9ks exposure time, PI: Th. Preibisch), and the results were
    presented in Preibisch & Zinnecker (2001, Cat. J/AJ/122/866) and
    Preibisch & Zinnecker (2002AJ....123.1613P). Three additional
    observations were performed in March 2008 (ObsID 8584, 50.1 ks
    exposure time, PI: N. Calvet, ObsID 8933, 40.1ks exposure time, PI:
    S. Wolk, and ObsID 8944, 38.6ks exposure time, PI: S. Wolk). While
    ObsID 606 was centered at the optical cluster center, ObsID 8584 is
    shifted by 5.6' to the south-west, and ObsIDs 8944 and 8944 are
    shifted 13.1' to the south-west. The total area covered by the
    combined Chandra data set is about 555 square-arcmin and includes most
    known cluster members.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        61       82   Stellar parameters for the sample of stars in IC 348
table3.dat        61       18   Stellar parameters for IC 348 members with upper limits


See also:
    J/AJ/122/866 : X-ray sources in IC 348 from Chandra (Preibisch+, 2001)


Byte-by-byte Description of file: table[23].dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    h       RAh       Right ascension (J2000)
   3-  4  I2    min     RAm       Right ascension (J2000)
   5-  9  F5.2  s       RAs       Right ascension (J2000)
      10  A1    ---     DE-       Declination sign (J2000)
  11- 12  I2    deg     DEd       Declination (J2000)
  13- 14  I2    arcmin  DEm       Declination (J2000)
  15- 18  F4.1  arcsec  DEs       Declination (J2000)
  20- 26  F7.3  Lsun    Lbol      Bolometric luminosity
  28- 32  A5    ---     SpType    MK spectral type
  34- 38  F5.1  d       Tover     ? Convective turnover time τc
  40- 44  F5.2  d       Per       Rotation period Prot
  46- 51  A6    ---     Class     [I/ ] YSO class (only in table2)
      53  A1    ---     l_LX      Limit flag on LX
  54- 61  E8.3  10-7W   LX        X-ray luminosity (erg/s)


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    10-May-2012