J/ApJ/549/441 Chandra observations of Orion Trapezium (Schulz+, 2001)
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 2001ApJ...549..441S
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 7x1028 and 2x1032ergs/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
(End) James Marcout, Patricia Bauer [CDS] 28-May-2001