View X-Atlas Observation

Observation ID	Observation Date	Target	Star Name	Object Class	Spectral Type	B-V Magnitude	RA (deg)	DEC (deg)	Exposure (s)
30	2000-09-27 23:21:26	H1504+65	WD 1501+664	White Dwarf	DZ...	0.0000	225.539980	66.205340	24992.25

Chandra Configuration for the Observation

Zeroth-Order Image

Zeroth-Order Events	Zeroth-Order Count Rate (cts/s)	Pileup
	0.0000

The zeroth-order image for H1504+65

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	0.634	-0.111	0.563
ACIS-I	0.695	0.301	0.824

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	1.059	0.016	3.117	0.034	4.475	0.018
ACIS-S	Q-norm	0.099	0.002	0.366	0.004	0.542	0.002
ACIS-I	keV	1.686	0.055	3.949	0.036	4.763	0.045
ACIS-I	Q-norm	0.180	0.007	0.474	0.005	0.580	0.006

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
0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000

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
0.0000	0.0000	7.3488	0.0000	7.3488	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000	0.0000

X-Atlas Spectral Metrics Listing

Spectral Fits

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

X-Atlas Spectral Fits Listing

LETG Light Curve

GLvary
Odds	1052.284
Prob.	1.000
Var. Index	10

LETG light curve for H1504+65, constructed from all ±1^st, ±2^nd, and ±3^rd order LETG events.

LETG LEG Spectrum

Image File Missing: High-Resolution 1st Order LEG spectrum of obsid 30

High-Resolution 1st Order LEG Spectrum for H1504+65

X-Atlas Data Products

Spectral Data
PHA II	LEG ±1^st Order PHA	LEG ±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