View X-Atlas Observation

Observation ID	Observation Date	Target	Star Name	Object Class	Spectral Type	B-V Magnitude	RA (deg)	DEC (deg)	Exposure (s)
7	2000-09-16 11:48:03	AR LAC-2 FIRST QUAD (1)	HD 210334	Variable of RS CVn type	G2IV+K0IV	0.7200	332.169700	45.742430	7358.43

Chandra Configuration for the Observation

Zeroth-Order Image

Zeroth-Order Events	Zeroth-Order Count Rate (cts/s)	Pileup
1518	0.2063	severe

The zeroth-order image for AR LAC-2 FIRST QUAD (1)

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	-0.262	0.185	-0.081
ACIS-I	-0.203	0.413	0.230

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	0.854	0.000	1.088	0.000	1.526	0.006
ACIS-S	Q-norm	0.072	0.000	0.102	0.000	0.159	0.001
ACIS-I	keV	0.956	0.000	1.205	0.004	1.672	0.005
ACIS-I	Q-norm	0.085	0.000	0.117	0.001	0.178	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
2.5183	2.0346	1.4517	3.1816	0.2519	0.2656	0.3292	0.2439	0.9484	0.5374	0.6057	0.3400	0.0691	0.0645

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
0.0150	0.0008	0.0040	0.0006	0.0197	0.0010	0.0371	0.0001	0.0380	0.0001	37.7946	0.1152

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 AR LAC-2 FIRST QUAD (1).
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 AR LAC-2 FIRST QUAD (1). 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 AR LAC-2 FIRST QUAD (1). 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		50.000		1.088		0.23		8.41595e-12	0.36969	1.58	75
ACIS-S	xswabs*(xsmekal1+xsmekal2)	0.048		2.467		0.761		0.56		1.02797e-12	0.221298	1.34	69
ACIS-I	xswabs*(xsmekal1+xsmekal2)	0.039		3.095		0.818		0.87		1.53702e-12	0.227068	1.08	70

X-Atlas Spectral Fits Listing

HETG Light Curve

GLvary
Odds	559.488
Prob.	1.000
Var. Index	10

HETG light curve for AR LAC-2 FIRST QUAD (1), 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 7

High-Resolution 1st Order HEG Spectrum for AR LAC-2 FIRST QUAD (1)

HETG MEG Spectrum

Image File Missing: High-Resolution 1st Order MEG Spectrum of obsid 7

High-Resolution 1st Order MEG Spectrum for AR LAC-2 FIRST QUAD (1)

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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