available here - Institute for Astronomy

AAS 2013 1/ 13
ROBOSPECT: Automated Equivalent Width
Measurement
Christopher Waters & Julie Krugler Hollek
Institute for Astronomy
University of Texas
Long Beach AAS, January 8, 2013

AAS 2013 2/ 13
What does ROBOSPECT do?
◮ Iteratively construct a best-fit
model to an input spectrum.
◮ Model the continuum level.
◮ Identify and fit spectral lines.
◮ Various line models
(Gaussian, Voigt, etc.).
◮ Measure equivalent widths,
line flux.
◮ Deblend closely spaced lines.

AAS 2013 3/ 13
What does ROBOSPECT do?
◮ Iteratively construct a best-fit
model to an input spectrum.
◮ Model the continuum level.
◮ Identify and fit spectral lines.
◮ Various line models
(Gaussian, Voigt, etc.).
◮ Measure equivalent widths,
line flux.
◮ Deblend closely spaced lines.

AAS 2013 4/ 13
What does ROBOSPECT do?
◮ Iteratively construct a best-fit
model to an input spectrum.
◮ Model the continuum level.
◮ Identify and fit spectral lines.
◮ Various line models
(Gaussian, Voigt, etc.).
◮ Measure equivalent widths,
line flux.
◮ Deblend closely spaced lines.

AAS 2013 5/ 13
Does it work on my data?
◮ Reads ascii and fits spectra.
◮ Data can be flux calibrated or
continuum normalized.
◮ Emission and absorption lines
identified and fit.
◮ Not designed for highly blended
bands (molecules, high
metallicity stars).

AAS 2013 6/ 13
Does it work on my data?
◮ Reads ascii and fits spectra.
◮ Data can be flux calibrated or
continuum normalized.
◮ Emission and absorption lines
identified and fit.
◮ Not designed for highly blended
bands (molecules, high
metallicity stars).

AAS 2013 7/ 13
Does it work on my data?
◮ Reads ascii and fits spectra.
◮ Data can be flux calibrated or
continuum normalized.
◮ Emission and absorption lines
identified and fit.
◮ Not designed for highly blended
bands (molecules, high
metallicity stars).

AAS 2013 8/ 13
How accurate is it?
◮ Iterative process reduces
continuum and lines covariance.
◮ Fit quality related to the input
spectrum S/N.
◮ Continuum placement is the
largest source of uncertainty.
◮ Matches measurements done by
hand.

AAS 2013 9/ 13
How accurate is it?
◮ Iterative process reduces
continuum and lines covariance.
◮ Fit quality related to the input
spectrum S/N.
◮ Continuum placement is the
largest source of uncertainty.
◮ Matches measurements done by
hand.

AAS 2013 10/ 13
When can I get it?
◮ Test version available from me now (see me at the
Pan-STARRS booth #132).
◮ Public release at
http://www.ifa.hawaii.edu/~watersc1/robospect/.
◮ Paper describing the algorithm and fit quality will be
submitted by the end of the month.
◮ Still writing the manual and documentation to make it easy
for other users.

Extra slides
AAS 2013 11/ 13

Extra slides
AAS 2013 12/ 13

Extra slides
AAS 2013 13/ 13