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Observation ID Observation Date Target Star Name Object Class Spectral Type B-V Magnitude RA (deg) DEC (deg) Exposure (s)
3756 2003-10-20 14:45:17 V987 TAU = HDE 283572 HD 283572 Weak-lined T Tauri-type Star G2III 0.7700 65.495180 28.301750 100458.82

Chandra Configuration for the Observation

Zeroth-Order Image

Image File Missing: Snapshot of the Zeroth-Order Image
Zeroth-Order Events Zeroth-Order Count Rate (cts/s) Pileup
7437 0.0740 severe
The zeroth-order image for V987 TAU = HDE 283572

Hardness Ratios and Quantiles

Hardness ratios and quantiles are calculated from the predicted ACIS-S or ACIS-I aimpoint spectra, as indicated.
Hardness Ratios
Aimpoint HR1 = (H-M)/(H+M) HR2 = (M-S)/(M+S) HR3 = (H-S)/(H+S)
ACIS-S -0.426 0.190 -0.257
ACIS-I -0.371 0.388 0.019
S, M, and H represent the predicted total counts in the following passbands:
S: 0.3-0.9 keV
M: 0.9-1.5 keV
H: 1.5-8.0 keV
Quantiles
Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 0.840 0.000 1.029 0.001 1.365 0.006
Q-norm 0.070 0.000 0.095 0.000 0.138 0.001
ACIS-I keV 0.913 0.007 1.102 0.006 1.482 0.006
Q-norm 0.080 0.001 0.104 0.001 0.153 0.001
Normalized quantiles (Q-norm) are defined as:
Qx = (Ex - Elo)/(Ehi - Elo)
Where Elo = 0.3 keV and Ehi = 8.0 keV.
Hardness Ratio plots and Quantile-based Color-Color DiagramsX-Atlas Hardness Ratios and Quantiles Listing

Spectral Metrics

A series of line-line, line-continuum, and continuum-continuum ratios calculated from the high-resolution 1st order MEG or LEG spectrum.
Line-Line Ratios
Ne X / O VIII Ne2O Error O VII(i) / O VII(f) Oif Error O VII(r) / O VIII O78 Error O VIII / Fe XVII O8Fe Error Mg XII / Fe XVII Mg2Fe Error Si XIV / Fe XVII Si2Fe Error S XV / Fe XVII S2Fe Error
6.6828 6.7626 0.0000 0.0000 0.1208 0.4047 0.1216 0.1113 0.6296 0.3583 0.5982 0.4973 0.0736 0.0949

short line / cont
Line-Continuum & Continuum-Continuum Ratios
sl2c Error long line / cont ll2c Error line / cont l2c Error cont long / cont short cl2cs Error cont long / cont med cl2cm Error cont med / cont short cm2cs Error
0.0355 0.0034 0.0094 0.0018 0.0469 0.0040 0.0790 0.0003 0.0823 0.0003 24.0745 0.1187
X-Atlas Spectral Metrics Listing

Spectral Fits

Image File Missing: 2T xsmekal zeroth-order fit
Mewe-Kaastra-Liedahl 2-temperature fit of the low-resolution zeroth-order spectrum of V987 TAU = HDE 283572.
Warning: The zeroth-order spectrum may be subject to distortions from pileup.

Image File Missing: 2T xsmekal ACIS-S fit
Mewe-Kaastra-Liedahl 2-temperature fit of the predicted low-resolution ACIS-S Aimpoint spectrum of V987 TAU = HDE 283572. The predicted spectrum was scaled to 1500 counts.

Image File Missing: 2T xsmekal ACIS-I fit
Mewe-Kaastra-Liedahl 2-temperature fit of the predicted low-resolution ACIS-I Aimpoint spectrum of V987 TAU = HDE 283572. The predicted spectrum was scaled to 1500 counts.

Aimpoint Model nH (1022/cm3) nH error kT (keV) kT error kT2 (keV) kT2 error Abundance (solar) Abundance error Flux (ergs/cm2/s) Flux Emission Ratio (kT2/kT1) Reduced Chi2 DoF
zeroth-order xswabs*(xsmekal1+xsmekal2) 0.034 3.101 0.924 0.33 3.16623e-12 1.12148 1.70 197
ACIS-S xswabs*(xsmekal1+xsmekal2) 0.063 1.547 0.587 0.31 7.04769e-14 0.375986 0.87 67
ACIS-I xswabs*(xsmekal1+xsmekal2) 0.036 1.865 0.792 0.35 1.00403e-13 0.807436 0.80 65
X-Atlas Spectral Fits Listing

HETG Light Curve

Image File Missing: HETG Light Curve
GLvary
Odds45.576
Prob.1.000
Var. Index10
HETG light curve for V987 TAU = HDE 283572, constructed from all ±1st, ±2nd, and ±3rd order HETG events.

HETG HEG Spectrum

Image File Missing: High-Resolution 1st Order HEG spectrum of obsid 3756
High-Resolution 1st Order HEG Spectrum for V987 TAU = HDE 283572

HETG MEG Spectrum

Image File Missing: High-Resolution 1st Order MEG Spectrum of obsid 3756
High-Resolution 1st Order MEG Spectrum for V987 TAU = HDE 283572

X-Atlas Data Products

Spectral Data
PHA II HEG ±1st Order PHA HEG ±1st Order gARF MEG ±1st Order PHA MEG ±1st Order gARF [Counts/s/Å] FITS [Counts/s/Å] text [ph/s/Å/cm2] FITS [ph/s/Å/cm2] text
Standard Data Products (Cycle 06)
Aimpoint ARFAimpoint RMF
ACIS-SACIS-IACIS-SACIS-I
Retrieve observation data from the Chandra Data Archive: WebChaSeR
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