Meeting GHOST2

1
Meeting GHOST2

• Participation in CU6

2
Overview

• Different deadlines depending on the state of the
  workpackages
• rv, Vsini for all types of stars cold to hot
  stars
• General information on spectra
• rv, Vsini on component of multiple system
• Detection of the variability

3
Algos
4
Algo, Single transit analysis
5
Single transit analysis Coarse characterization
of sourcesS650-06000 C.Martayan, A.-M. Hubert

• Lists of abs/Em lines (common with CU8)
• Give S/N ratios
• Give slopes of spectra
• Determine RVS magnitudes, comparisons RVS vs
  spectro-photométrie and vs ground-based
  photometry
• Use templates/masks for lines and
  cross-correlation

6
Single transit analysis Coarse characterization
of sources

• Other tasks to add ?
• Cycle 2 10/2006-05/2007
• Define methods
• Specification of requirements
• Obtaining observed and synthetic spectra
• Cycle 3 05/2007-11/2007
• Define and write algorithms
• Observations
• Tests with observed and synthetic spectra
• Improvement of methods/algo.

7
Algos
8
Single transit analysisrv Vsini in Fourier
space S650-08000/09000 Y. Frémat, A. Lobel, C.
Delle-Luche, S. Jankov

• rv, use of cross-correlation in Fourier space
• Functional analysis done
• Fortran prototype good results
• Cold to hot stars
• Vsini0, rv20 ltrvgt19.75-19.84 for V6-14
• Vsini150, rv20 ltrvgt18.94-19.27 for V6-14

9
Single transit analysisrv Vsini in Fourier
space S650-08000/09000 Y. Frémat, A. Lobel, C.
Delle-Luche, S. Jankov

• Cycle 2
• delivery soft requirements,
• soft design,
• end of fortran prototype, implementation of java
  algo.
• Tests of java algo, delivery soft products
• Validation of soft
• Cycle 3 beginning of Vsini study

10
Single transit analysisrv Vsini by mini
distance method S650-10000 R. Blomme, A. Lobel

• Input grids of template spectra Teff, logg
  (provided by CU8)
• Method defined
• Algo try broadening function, rv shift, best fit
• Other method Least Square Deconvolution
• Cycle 2 implementation 1st solution direct in
  java
• Cycle 3 implementation 2nd solution

11
Algos
multiple transits analysis
12
Multiple transits analysisRV Vsini for
multiple line systemsS660-04000 E. Gosset, G.
Rauw, Y. Nazé

• Using TODCOR method 2D cross-correlation with 2
  templates of spectra
• Ratio of flux pre-defined or fitted
• Cycle2 flux ratio fixed, test data to be
  computed
• Problems of parameters difficult in case of
  multiple lines
• Provide a flag to indicate the multiplicity
• Recruitment of 1 postdoc

13
Multiple transits analysisAssess source
variabilityS660-06000 P. De Cat, L. Eyer,
A.-M. Hubert, S. Jankov, P. Dubath, S. Udry

• Drv as function of type of variable
• Detection of the variability in CU6 (CU7
  analyses)
• Function of the S/N ratio
• Statistical tests (low S/N)
• Cross-correlation peak (intermediate S/N)
• Line profile variation, study of Em lines (good
  S/N)
• Cycle2 analysis on low S/N ratio, statistical
  tests on rv distributions, prototypes will be
  developed
• Cycle3 request for simulated data