J/A+A/524/A97 XMM observations of η Cha cluster (Lopez-Santiago+, 2010)
Deep XMM-Newton observation of the η Chamaleontis cluster.
Lopez-Santiago J., Albacete-Colombo J.F., Lopez-Garcia M.A.
<Astron. Astrophys. 524, A97 (2010)>
=2010A&A...524A..97L 2010A&A...524A..97L
ADC_Keywords: Clusters, open ; X-ray sources
Keywords: open clusters and associations: individual: eta Chamaleontis -
stars: pre-main sequence - stars: coronae - stars: flare; X-ray: stars
Abstract:
The members of the η Chamaleontis cluster are in an evolutionary
stage in which disks are rapidly evolving. It also exhibits some
peculiarities, such as the large fraction of binaries and accretion
disks, probably related to the cluster formation process. Its
proximity makes this stellar group an ideal target for studying the
relation between X-ray emission and those stellar parameters.
Our main objective is to determine the general X-ray properties of the
cluster members in terms of coronal temperature, column density,
emission measure, X-ray luminosity, and variability. We also aim to
establish the relation between the X-ray luminosity of these stars and
other stellar parameters, such as effective temperature, binarity, and
the presence of accretion disks. Finally, a study of flare energies in
each flare event detected during the observations and their relation
with some stellar parameters is also performed.
Description:
We used proprietary data from a deep XMM-Newton EPIC observation
targeting the core of the η Chamaleontis cluster. Specific software
for the reduction of XMM-Newton data was used to analyze our
observation. To detect sources in the composed EPIC pn+mos image, we
used the wavelet-based code PWDetect. General coronal properties were
derived from plasma model fitting. X-ray light curves in the
0.3-8.0keV energy range were generated for each star.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 89 86 Sources detected in the 0.3-7.5keV energy band
using PWDetect with detection threshold SNR=5
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2009)
IX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [01/86] Source sequential number
4- 5 I2 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 13 F4.1 s RAs Right ascension (J2000)
15 A1 --- DE- Declination sign (J2000)
16- 17 I2 deg DEd Declination (J2000)
19- 20 I2 arcmin DEm Declination (J2000)
22- 25 F4.1 arcsec DEs Declination (J2000)
27- 31 F5.1 --- Signi Significance of the detection
33- 37 F5.1 ct/ks Counts Observed counts in 0.3-7.5keV band
(in units of 10-3s-1)
39- 42 F4.1 ct/ks e_Counts Error in the observed counts (in 10-3s-1)
44- 48 F5.2 10-16W/m2 Flux Observed flux in 0.3-7.5keV band
(in units of 10-13erg/cm2/s)
50- 53 F4.2 10-16W/m2 e_Flux Error in the flux (in 10-13erg/cm2/s)
55- 77 A23 --- OName Other name
79- 89 A11 --- Note Remark
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Acknowledgements:
Javier Lopez-Santiago, jls(at)astrax.fis.ucm.es
(End) Javier Lopez-Santiago [UCM, Spain], Patricia Vannier [CDS] 09-Nov-2010