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OAG COMMON PROPER MOTIONS WIDE PAIRS SURVEY

This meeting discusses the search and cataloging of star pairs with common proper motion not yet listed in catalogs. It covers historical background, coordination, method, data collection, and future plans.

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OAG COMMON PROPER MOTIONS WIDE PAIRS SURVEY

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  1. OAG COMMON PROPER MOTIONS WIDE PAIRS SURVEY II MEETING DOUBLE STAR OBSERVERS (Pro-Am) Sabadell 23-24 October 2010 Xavier Miret / Tòfol Tobal Observatori Astronòmic del Garraf (OAG) www.oagarraf.net

  2. OAG CPM WPS • Project: Search and detection of star pairs with CPM not catalogued yet. • FEATURES: • VISUAL SURVEY. Visual inspection of digitized plates. • SYSTEMATIC SURVEY. Scanning selected areas.

  3. HISTORICAL BACKGROUND • W.J. Luyten • Main contribution to double stars with CPM • Year 1979 • NLTT > 58.000 stars • LDS > 6.000 pairs • μ > 0.2 arcsec yr -1

  4. HISTORICAL BACKGROUND • Lépine & Shara • SUPERBLINK software. • 2003-2008 • LSPM > 122.000 • > 1000 doubles • μ > 0,15 arcseg yr -1

  5. HISTORICAL BACKGROUND • GARRAF SURVEY (2008). Search for companions of near 2.000 NLTT between 0,5 and 1 arcseg yr -1 • J. A. Caballero & D. Montes

  6. GARRAF SURVEY LUYTEN STARS

  7. STARS TO STUDY • Stellar population with CPM < 0,15 arcsec yr -1 not studied up to now. • Some pairs with CPM > 0,15 arcsec yr -1 not catalogued before.

  8. COORDINATION & TEAMS • Coordination OAG. • Collaboration AAS. C. Schnabel. • Open information: www.oagarraf.net

  9. OAG CPMWP SURVEYWorkshop I & II February and July 2010, Sabadell (Barcelona) Tutorials. Method Techniques Practical examples Resolution of questions. Adjudication sectors. Timetable. Preparation of publications. Organization: OAG / AAS

  10. CURRENT STATUS • > 500 pairs catalogued up to now. • 10 amateur teams on work. • Forecast: 12 h RA at the end 2010.

  11. METHOD • Loading images POSS I and POSS II (15 x 15 arcmin). Δt +/- 40 years. • Blinking RGB. Identification of pairs. • Crossing catalogues. USNOB1 and NOMAD1. • Collecting data. • Polar coordinates. Theta/Rho. Aladin vector tool.

  12. LOADING IMAGES

  13. BLINKING RGB

  14. BLINKING RGB

  15. BLINKING RGB

  16. CROSSING CATALOGUES

  17. POLAR COORDINATES • Theta/Rho measures on digitized plates. • Optimization centroid (Image convolution). • Aladin vector tool (Manual path). • Reference. I Novalbos communication.

  18. TARGETS • Pairs with sep > 5”. No superior limit. • No magnitude limit. • PM > 50 marcsec y -1 in at least one coordinate. • Maximum difference in PM between components < 10 marcsec y -1 in two coordinates. ◄

  19. TARGETS • ¿What is the proper motions difference between components? • Always < 15% the absolute value of PM • Always < 3 X mean error (catalogue value)

  20. DATA COLLECTION 1 • IDENTIFICATION. USNOB1 / NOMAD1 / 2MASS / TYCHO2 / HIPPARCOS • RA / DEC J2000 • MAGNITUDE V or R • PM RA • PM DEC • PM CATALOGUE SOURCE

  21. DATA COLLECTION 2 • THETA • RHO • EPOCH • In case of lack of PM in pairs with suggestive image blinking we make multiepoch astrometry to support the CPM character.

  22. MULTIEPOCH ASTROMETRY

  23. RESULTS. MAGNITUDE.

  24. RESULTS PROPER MOTIONSSAMPLE 187 PAIRS

  25. PUBLICATION • Revision and cataloguing USNO / WDS: B.D.Mason (USNO). • Electronic publication: USNO/WDS Website • Publication: Webb Society DSSC: B.Argyle • Professional studies and publications. J. A.Caballero , D. Montes.

  26. FUTURE • Encourage professional and amateur teams interested so that the project can be improved. • Searching and development a software capable to find the same pairs automatically. • Stellar characterization in at least some subgroups of stars.

  27. Observatori Astronòmic del GarrafParc del Garraf (Barcelona)

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