Presentation is loading. Please wait.

Presentation is loading. Please wait.

Questionnaire survey on standard stars

Similar presentations

Presentation on theme: "Questionnaire survey on standard stars"— Presentation transcript:

1 Questionnaire survey on standard stars
Topics of the survey: Basic info about polarimetric project Used instrument Requirements for science targets Information about used standard stars Interesting feedback: Thank you! 9 forms received (10 projects)

2 Science topics: Solar system objects
Kiselev Nikolay Comets, scattering and molecular emission Vis. Polarimetry Linear (+circ ) Hadamcik (Levasseur-Regourd) Comets, Asteroids scattering Vis. Polarimetry and imaging pol. linear Rosenbush Vera Asteroids, Moons, minor bodies Vis. Polarimetry, imaging pol., spec.pol, linear Comets, circular polarization (multiple scattering, chirality) Vis. Polarimetry, circular (+lin.) Schmid, Hans Martin Giant planets, limb polarization Vis. imaging pol. spec. pol linear

3 Science topics: stellar physics
David Buckley Magnetic CVs (polars) Vis. pol. spec.pol, circular+linear Kochukhov O. Zeeman spectropol. of magnetic stars Vis. Spec.pol (HR) circular+linear Harrington David Herbig and Be stars, scattering, pumping Vis. Spec.pol (HR) linear Hashimoto Jun Circumstellar disks, scattering IR, AO, imaging pol. linear Science topics: extra-galactic Heidt Jochen Radio-loud AGNs polarization var. Vis. Imaging. pol, linear

4 Requirements and limitations
Targets Autor Sensitivity Limitations n ins. cal, var. bckg. Comets, asteroids, Hadamcik, % x x Planets, limb Schmid % x x Comets Kiselev % x x Minor bodies, comets Rosenbush % x x x protopl.. Disks Hashimoto % x x Magnetic CVs Buckley % x x Herbig, Be stars Harrington % x x Ap-stars Zeeman Kochukov % x x x RL-AGN variab. Heidt % x

5 Use of standard stars All programs (except 1) use 0-pol. and high-pol. standards All programs on circ. Polarization use circ-pol standards Use of 0-pol. standards 6 calibration of instrument polarization 3 check (circumstellar disks, planet limbs, AGN) 1 not used (Zeeman pol.) Use of high pol. standards 9: check (cal) 0 degr. polarization angle , efficiency-check 3: cross talk check 0: not used Use of circ. Pol standards 5: Check-V 3: Check-cross talk 5: Not used (linear polarization)

6 Properties of 0-pol standard stars
Brightness of 0-pol. standards 0: too faint 8: O.K  3: too bright Distribution of 0-pol. standards 2: good 2: O.K. 6: poor  Quality of 0-pol. standards 1: high 8: O.K  0: poor

7 Properties of high-pol standards
Brightness of high-pol. standards 1: too faint 7: O.K  1: too bright Distribution of high-pol. standards 1: good 2: O.K  8: poor Quality of high-pol. standards 1: high 8: O.K  0: poor

8 Properties of circ-pol standards
Brightness of circ-pol. standards 3: too faint 0: O.K  1: too bright Distribution of circ-pol. standards 0: good 1: O.K  3: poor Quality of circ-pol. standards 0: high 2: poor

9 References for standard stars
3: Whittet et al.(1992) 3: Tunschek et al. (1992) 2: Schmidt et al. (1992) 2: Heiles (2000) 2: Angel and Landstreet (1970) circ. 2: Hsu + Breger (1982) 2: Serkowski – UKIRT-List 2: FORS-list 1: Michalsky 1976 1: slowly rot. AP stars (Zeeman-spect.)

10 What should be improved with standard stars
All types of standards 3: higher accuracy 4: less variable 8: more standard objects 2: fainter standards 3: brighter (circ). standards 1: R-band data missing

11 Summary Survey gives some clear hints Main use of calibration targets
calibration of instrument polarization check/cal. 0-degr angle, check efficiency check V signal Main problems of standard stars Distribution of 0-pol. and high-pol. is poor Circular polarization standards are bad (all prop) Requirements More standard stars Higher accuracy, less variable

12 What could be done? 1) Are there unpublished data on standard stars?
 survey the archives  coordinate expertise within COST can the distribution of standards be improved? 2) elaborate the exact requirements for better instrument calibration with standard stars 3) Try to get new data if required

Download ppt "Questionnaire survey on standard stars"

Similar presentations

Ads by Google