View X-Atlas Observation

Observation ID	Observation Date	Target	Star Name	Object Class	Spectral Type	B-V Magnitude	RA (deg)	DEC (deg)	Exposure (s)
16	1999-10-09 11:22:12	AB DOR	HD 36705	Rotationally variable Star	K1IIIp...	0.8000	82.186880	-65.448710	52333.62

Chandra Configuration for the Observation

Zeroth-Order Image

Zeroth-Order Events	Zeroth-Order Count Rate (cts/s)	Pileup
11627	0.2222	severe

The zeroth-order image for AB DOR

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	-0.517	0.002	-0.516
ACIS-I	-0.464	0.232	-0.260

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	0.767	7.234	0.956	0.000	1.205	0.005
ACIS-S	Q-norm	0.061	0.939	0.085	0.000	0.117	0.001
ACIS-I	keV	0.854	0.005	1.029	6.971	1.365	0.007
ACIS-I	Q-norm	0.072	0.001	0.095	0.905	0.138	0.001

Normalized quantiles (Q-norm) are defined as:

Q_x = (E_x - E_lo)/(E_hi - E_lo)

Where E_lo = 0.3 keV and E_hi = 8.0 keV.

Hardness Ratio plots and Quantile-based Color-Color Diagrams

X-Atlas Hardness Ratios and Quantiles Listing

Spectral Metrics

A series of line-line, line-continuum, and continuum-continuum ratios calculated from the high-resolution 1^st 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
2.2957	1.3755	0.8168	0.9402	0.1047	0.0777	0.2727	0.1152	0.1200	0.0372	0.0939	0.0392	0.0059	0.0033

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
0.0054	0.0003	0.0046	0.0004	0.0111	0.0007	0.0302	0.0000	0.0304	0.0000	160.2537	0.4277

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 AB DOR.
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 AB DOR. 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 AB DOR. 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)	0.000		6.356		0.823		0.21		9.86571e-12	0.222321	1.85	326
ACIS-S	xswabs*(xsmekal1+xsmekal2)	0.000		1.004		0.964		0.12		1.27966e-13	0	1.79	61
ACIS-I	xswabs*(xsmekal1+xsmekal2)	0.000		2.424		0.802		0.15		2.08905e-13	2.39708	1.03	64

X-Atlas Spectral Fits Listing

HETG Light Curve

GLvary
Odds	184.655
Prob.	1.000
Var. Index	10

HETG light curve for AB DOR, constructed from all ±1^st, ±2^nd, and ±3^rd order HETG events.

HETG HEG Spectrum

Image File Missing: High-Resolution 1st Order HEG spectrum of obsid 16

High-Resolution 1st Order HEG Spectrum for AB DOR

HETG MEG Spectrum

Image File Missing: High-Resolution 1st Order MEG Spectrum of obsid 16

High-Resolution 1st Order MEG Spectrum for AB DOR

X-Atlas Data Products

Spectral Data
PHA II	HEG ±1^st Order PHA	HEG ±1^st Order gARF	MEG ±1^st Order PHA	MEG ±1^st 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 ARF		Aimpoint RMF
ACIS-S	ACIS-I	ACIS-S	ACIS-I

Retrieve observation data from the Chandra Data Archive: WebChaSeR

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