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Radial-velocity observations of pulsating stars with a new Poznań Spectroscopic Telescope

Poznań Astronomical Observatory Adam Mickiewicz University Poznań, Poland. Radial-velocity observations of pulsating stars with a new Poznań Spectroscopic Telescope. 23 June 2008. Our team R. Baranowski, P. Bartczak, W. Borczyk, W. Dimitrov, M. Fagas, K. Kamiński, T. Kwiatkowski,

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Radial-velocity observations of pulsating stars with a new Poznań Spectroscopic Telescope

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  1. Poznań Astronomical Observatory Adam Mickiewicz University Poznań, Poland Radial-velocity observations of pulsating stars with a new Poznań Spectroscopic Telescope 23 June 2008

  2. Our team • R. Baranowski, P. Bartczak, W. Borczyk, • W. Dimitrov, M. Fagas, K. Kamiński, T. Kwiatkowski, • R. Ratajczak, A. Rożek, A. Schwarzenberg-Czerny

  3. The „dome”

  4. The telescope Mirors diameter – 0.4 m Focal length – 1.8 m Optical system – Newtonian Diameter of the fibers – 50 m Accesible altitudes h>24° Mean. slewing rate 90°/min Guiding cameras ST7

  5. The echellé spectrograph Baudrand and Bohm (1992)

  6. CCD camera: Andor DZ 436 5-stage peltier cooling Temp. –95°C 2048 x 2048 pix pixel size 13.5 x 13.5μm dark current <1el/h readout noise 2.1 el/pix Echellé spectrograph Spectral range: 4480 Å – 9250 Å Resolution: R=35000 (~8 km/s)

  7. Acquisition box

  8. Echellé spectrum – 64 orders 4480 Å – 9250 Å blue range: 1pix = 0.04 Å order length = 80 Å every order adds 40 Å middle: 1pix = 0.05 Å ~2.5 km/s order length = 100 Åevery order adds 80 Å red range: 1pix = 0.08 Å order length = 160 Å every order adds 125 Å

  9. ThAr calibration spectrum 1400 lines

  10. Flatfield and fringe effect

  11. Flatfield and fringe effect

  12. Telluric lines removal

  13. Flux calibration

  14. Line profiles Sp=B1 V=1m exp=250s Hβ 4861 Å

  15. Limiting magnitude - BD+39 3012C 11m.2 Sp=F5 exp=30min

  16. 28 And δ Sct Sp=A7III V=5m.2 exp=600s analysed by T. Kwiatkowski, W. Borczyk & A. Rożek

  17. γ Peg β Cep Sp=B2IV V=2m.8 exp=600s or 300s period=3.4h υ1=6.59 c/d analysed by W. Borczyk

  18. V440 Per δ Cep Sp=F7Ib V=6m.3 exp=600s • σpoz=136 m/s • --2 harmonics • --1 harmonic analysed by A.Schwarzenberg-Czerny and M. Fagas

  19. Polaris analysed by M. Fagas and K. Kamiński

  20. Statistics • 13 august 2007 - 30 may 2008 • 83 nights • 637 hours • 1080 science spectra • Colaborators • Warsaw CAMK • Vienna Institute of Astronomy • Wrocław Astronomical Institute • Toruń Centre for Astronomy

  21. Future perspectives • Upgrade of the telescope: • 2 x 0.5m mirrors • simultaneous exposure of two fibers • better automatisation and remote control • Upgrade of the calibration, some ideas: • experiment - mixing the ThAr and stellar light • Vrad accuracy increase with a iodine cell • spectral resolution increase with the EDI interferometer • Radial velocity measurements: • broadening function • TODCOR • spectral disentangling

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