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J/ApJ/549/441       Chandra observations of Orion Trapezium  (Schulz+, 2001)
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Chandra observations of variable embedded X-ray sources in Orion.
I. Resolving the Orion Trapezium.
    Schulz N.S., Canizares C., Huenemoerder D., Kastner J.H., Taylor S.C.,
    Bergstroem E.J.
   <Astrophys. J. 549, 441 (2001)>
   =2001ApJ...549..441S
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ADC_Keywords: Clusters, open ; X-ray sources ; Cross identifications
Mission_Name: Chandra
Keywords: open clusters and associations: individual (Trapezium) -
          stars: early-type - stars: formation - techniques: spectroscopic -
          X-rays: stars

Abstract:
    We used the High-Energy Transmission Grating Spectrometer on board the
    Chandra X-Ray Observatory to perform two observations, separated by 3
    weeks, of the Orion Trapezium region. The zeroth-order images on the
    Advanced CCD Imaging Spectrometer provide spatial resolution of 0.5"
    and moderate energy resolution. Within a 160"x140" region around the
    Orion Trapezium, we resolve 111 X-ray sources with luminosities
    between 7x10^28^ and 2x10^32^ergs/s. We do not detect any diffuse
    emission. All but six sources are identified.

File Summary:
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 FileName     Lrecl  Records   Explanations
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ReadMe           80        .   This file
table1.dat       94      111   Source positions, count rates and identifications
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See also:
  J/AJ/117/1375 : Orion Trapezium cluster (Simon+, 1999)
  J/A+A/299/39  : Orion Trapezium area ROSAT PSPC obs. I. (Geier+, 1995)

Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label       Explanations
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   1-  3  A3    ---     [SCH2001]   Source designation
   5-  6  I2    h       RAh         Right ascension (J2000.0)
   8-  9  I2    min     RAm         Right ascension (J2000.0)
  11- 15  F5.2  s       RAs         Right ascension (J2000.0)
      17  A1    ---     DE-         Declination sign (J2000.0)
  18- 19  I2    deg     DEd         Declination sign (J2000.0)
  21- 22  I2    arcmin  DEm         Declination sign (J2000.0)
  24- 28  F5.2  arcsec  DEs         Declination sign (J2000.0)
  30- 34  I5    ct      TotalCount  Total counts (1999 October plus November)
  36- 41  F6.2 10-3ct/s CR10        ? October count rate
  43- 48  F6.2 10-3ct/s CR11        ? November count rate
  50- 94  A45   ---     Names       Identification
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History:
    From electronic version of the journal
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(End)                         James Marcout, Patricia Bauer [CDS]    28-May-2001