spectroscopic analysis of double-lined binary systems · the role of spectroscopy triplespec...

Spectroscopic analysis of double-lined binary systems

Andrew Tkachenko and IvS team

Instituut voor Sterrenkunde, KU Leuven

Binary workshop, 14.04.2015

Why spectrum analysis?

Because it is important!


The role of spectroscopy

TripleSpec [email protected] Hale telescope

2014 Science, 344, 277



The HIRES spectrograph@10m Keck telescope

2013 Nature, 503, 381



The FIES [email protected] NOT telescope

2013 Science, 342, 331



The HRS [email protected] HET telescope +

The Tull Coude [email protected] HJST telescope +

The HIRES spectrograph@10m Keck telescope +


2012 Nature, 481, 475



The SES [email protected] Otto Struve telescope +

The NARVAL spectrograph@2m TBL telescope +


2011 Nature, 477, 570



FIES + TLS + DAO + Tull

2011 Science, 332, 216


Spectrum analysis

• Precise atmospheric parameters + chemical composition

• Production and evolution of chemical elements, stellar and galactic evolution

• Understanding of various physical processes in stars


Spectral disentagling what is it about?



Separation of individual spectra + binary parameters

Simon & Sturm (1994, A&A, 281, 286): disentangling in wavelength domain Æ spectrum separation + RV amplitudes

Spectral disentagling what is it about?

Hadrava (1995, A&AS, 114, 393): disentangling in Fourier space Æ spectrum separation + orbital elements.


Spectral disentagling in practice

FDBinary code (Ilijic et al. 2004, ASPC, 318, 11)

Web site: http://sail.zpf.fer.hr/fdbinary


• Current version 3 (fdb3)

• Disentangling of spectra in the Fourier space.

• The code is written in C and is designed as a command- line utility for a Unix-like operating system.

• Three component hierarchical orbital model.

• AÆB – close pair in a wide (eccentric) Keplerian orbit with tertiary C.

FDBinary


• demo.in: control file with descriptors to observed spectra, and orbital parameters initial guess with limits for optimization. Times are in days, velocities in km/s, angles in degrees.

FDBinary: input

• demo.obs: observed spectra Æ wavelength (log-scale) normalized flux


FDBinary: input file



Time-series of observations (log-wavelength vs.

normalized flux)



Wavelength range to be disentangled (log-scale)



(Output) file with the observations in the

wavelength range used for the disentangling



Number of stellar components



Characteristics of the observed

spectra



Julian date of the observation



Heliocentric radial velocity correction



Weight



Light factor (primary)



Light factor (secondary)



Parameters of the outer orbit



Parameters of the inner orbit



period T0 e Z K1 K2



Optimization runs + iterations + tolerance



Disentangled spectra



Residuals (O-C)



Radial velocities (pixel units)



Log-file


FDBinary: output files (*.mod)

Wavelength (log-scale)

Flux1

Flux2


FDBinary: output files (*.rvs)

RV1 RV2


FDBinary: example

RV1 RV2

Observations + fit

Disentangled spectra


Spectrum analysis in practice

GSSP code (Tkachenko 2015, in preparation)

Will be available on the IvS web site after the workshop

The GSSP package

• GSSP_single:

• GSSP_binary:

• GSSP_composite:


The GSSP package: building blocks • The SynthV code (Tsymbal 1996): LTE-based radiative

transfer, individual abundances, stratification, atomic + molecular transitions

• The LLmodels code (Shulyak 2004): LTE-based atmosphere models, line-by-line opacities, individual abundances, stratification

• Bonus: MARCS models (low temperatures), interpolated grid of Kurucz models


The GSSP package: LLmodels grid


The GSSP_single module: algorithm

Single stars +

Disentangled spectra of binary components


Valentina

Text

GSSP_single: single stars

Application to Vega

(Lehmann et al. 2011)


GSSP_single: single stars


GSSP_single: more examples


GSSP_single: disentnalged spectra

IvS seminar, 10.04.2015

primary secondary

GSSP_single: disentangled spectra

IvS seminar, 10.04.2015

KIC 4931738: Papics et al. (2013)

primary secondary

The GSSP_binary module: algorithm

Disentangled spectra of binary components

(wavelength-dependent light dilution)


GSSP_binary: disentangled spectra


GSSP_binary: disentangled spectra

KIC 4931738: Papics et al. (2013)

primary secondary


GSSP_binary: disentangled spectra KIC 6352430: Papics et al. (2013)


The GSSP_composite module: algorithm

Composite spectra fitting


GSSP_composite: composite spectra

primary

composite

secondary


The GSSP package: documentation

Appendix


The GSSP package@IvS

Single machine: mpirun –n N executable_name input_file

SLURM: sbatch SLURm_command_file

Best „documentation“: office 03.32


The GSSP package with SLURM Run time in

minutes Number of

CPUs

Output and log-files

Basic setup, work directory, running

command


The GSSP package: output

Grid of atmosphere models


The GSSP package: output

F2 tables


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