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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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