FXCOR: INDEF Velocities

Prabhani wrote on Jul 12, 2018

Hi!

I am trying to calculate radial velocities using FXCOR. I am testing with two fits files. I do not get velocity values; except I get all the velocities as INDEF. Could you please help me figure out what's wrong?

Thanks in advance!

-Prabhani

This is how my rv.log looks like:

Description of Fit to CCF Peak and Cross-Correlation

NOAO/IRAF V2.16 ****** Thu 01:37:50 12-Jul-2018

Obj = ` aperture_19.fits[19]' star = `'

Temp = ` temp.0182.fits[19]' star = `'

Deltav = INDEF Km/sec Tempvel = INDEF Km/sec

Fit Parameters:

Function = `gaussian' Width = INDEF

Height = 0. Minwidth = 3.

Peak = no Maxwidth = 21.

Weights = YES Background = 0.

Wincenter = INDEF Window = INDEF

Number of points fit = 21

Number of iterations = 4

Number of coeffs fit = 1 - 3

Chi Squared of fit = 9.238E-5

Fit Coefficients:

c[1] = 0.2691 +/- 0.4598 # Amplitude

c[2] = -0.1959 +/- 15.799 # Center

c[3] = 35.7311 +/- 261.15 # Sigma^2

c[4] = 0.0000 (fixed) # Background

Mean Residual = 0.0057840

Sigma of Residuals = 0.0166981

Maximum of cross-correlation is in bin = -1.

Variance of cross-correlation = 0.009574991

HJD of observation = INDEF MJD = INDEF

Object sample used in correlation = `*'

Template sample used in correlation = `*'

Tonry&Davis R value = 19.87068

Velocity Results:

Shift of peak = -0.1959 pixels

Correlation height = 0.269

FWHM of peak = INDEF Km/sec (=14.07606 pixels)

Velocity computed from shift = INDEF Km/sec

Observed velocity = INDEF Km/sec

Heliocentric velocity = INDEF +/- INDEF Km/sec

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Last post on Jul 12, 2018