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 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 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