Beatrice bucciarelli slides put together by norbert zacharias
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Beatrice Bucciarelli (slides put together by Norbert Zacharias). report AC/CdC WG. overview. efforts since last IAU with goals: exploit scientific potential of these plates make digitized images available to community specific achievements summarized here. Cordoba Zone.

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Beatrice bucciarelli slides put together by norbert zacharias

Beatrice Bucciarelli

(slides put together by Norbert Zacharias)

report AC/CdC WG


Overview

overview

  • efforts since last IAU with goals:

    • exploit scientific potential of these plates

    • make digitized images available to community

  • specific achievements summarized here


Cordoba zone

Cordoba Zone

  • plates digitized with UMAX Astra1220P

    • low resolution, quick-and-raw

    • Calderon et al. 2004, Astroph.Sp.Sc. 290, 345

    • positional accuracy ~ 1 arcsec (TBD)

    • images available to community

    • high resolution images of areas upon request


San fernando

San Fernando

  • Real Inst. y Observ. de la Armada en S.F.

    • completed with precision scanner of AC/CdC

    • Dec zones -3 ... -9 deg

    • digitized in 2 orientations: 90 deg rotated

    • images in FITS on CD-ROM

    • copies can be requested from ROA, Spain


Ccd imaging

CCD imaging

  • new method / reduction

    • Fierro & Calderon (2003, Rev.Mex. 39,303)

    • use CCD camera for AC/CdC plates

    • test on plates of Cordoba Zone

    • astrometric errors 0.2 to 0.25 arcsec (in comparison to Tycho-2)

    • likely worse for fainter stars


Toulouse

Toulouse

  • Lamareille et al. (2003, A&A 402, 395)

    • AGFA Snapscan 12365 for CdC plates

    • for stellar photometry, 600 dpi

    • use 100 standard stars/plate

    • accuracy = 0.2 to 0.4 mag

    • depending on location on plate


Pm2000

PM2000

  • Ducourant et al. (2006 A&A 448, 1235)

    • proper motions catalog for 2,670,974 stars

    • complete to V = 15.4

    • 512 CdC plates Bordeaux zone

    • plates digitized at APM, Cambridge

    • + recent epoch Bordeaux CCD meridian circ.

    • errors: 1.5 to 6 mas/yr depend. on mag


Sydney

Sydney

  • Fresneau et al. (2003 AJ 125, 1519, 2005 AJ 130, 2701)

    • set of 650 CdC plates of Syndey Observ.

    • digitized at APM, Cambridge

    • combine with GSC 1.2 data -> proper motions

    • identify high PM stars ( > 15 mas/yr)

    • derive distances, different. rotation gal.plane up to 500 pc from Sun

    • investigate VO


Summary

summary

  • no 1 um accuracy (60 mas) on CdC plates

  • 2-3 um is achievable, worse at faint mags

  • = 0.2 to 0.3 arcsec at epoch 1900

  • + recent epoch observ. --> 2 – 5 mas/yr

  • --> 25 ... 60 km/s tangent.veloc. at 500 pc

  • CdC plates need to be salvaged

  • unique 100 yr old picture of the sky

  • best interest: join PDPP and WG AC/CdC

  • what accuracy can scanners give?


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