View X-Atlas Observation

Observation ID	Observation Date	Target	Star Name	Object Class	Spectral Type	B-V Magnitude	RA (deg)	DEC (deg)	Exposure (s)
3454	2002-03-27 09:33:57	GK PER	HD 21629	Cataclysmic Variable Star	sd:Be+...	-2.6800	52.799980	43.904290	31581.52

Chandra Configuration for the Observation

Zeroth-Order Image

Zeroth-Order Events	Zeroth-Order Count Rate (cts/s)	Pileup
8684	0.2750	severe

The zeroth-order image for GK PER

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	0.880	-0.539	0.649
ACIS-I	0.907	-0.201	0.863

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	2.081	0.027	4.241	0.008	5.512	0.008
ACIS-S	Q-norm	0.231	0.004	0.512	0.001	0.677	0.001
ACIS-I	keV	3.409	0.010	4.650	0.008	5.818	0.008
ACIS-I	Q-norm	0.404	0.001	0.565	0.001	0.717	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
1.5360	1.8736	8.6813	37.4401	14.4818	10.8698	0.0799	0.0719	0.2133	0.2054	0.2598	0.1891	0.1895	0.2422

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
0.0672	0.0036	0.0040	0.0014	0.0714	0.0038	0.1612	0.0005	0.4303	0.0024	0.5988	0.0030

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 GK PER.
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 GK PER. 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 GK PER. 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)	10.000		30.000		0.109		2.37		1.15787e-11	0	5.50	275
ACIS-S	xswabs*(xsmekal1+xsmekal2)	0.010		30.000		1.000		1.49		1.23352e-13	0	13.36	85
ACIS-I	xswabs*(xsmekal1+xsmekal2)	0.010		30.000		1.000		1.50		1.29351e-13	0	13.47	86

X-Atlas Spectral Fits Listing

HETG Light Curve

GLvary
Odds	745.238
Prob.	1.000
Var. Index	10

HETG light curve for GK PER, 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 3454

High-Resolution 1st Order HEG Spectrum for GK PER

HETG MEG Spectrum

Image File Missing: High-Resolution 1st Order MEG Spectrum of obsid 3454

High-Resolution 1st Order MEG Spectrum for GK PER

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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