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Proiectele OGLE si ASAS: Performantele Telescoapelor Mici in Contextul Stiintific Actual

Proiectele OGLE si ASAS: Performantele Telescoapelor Mici in Contextul Stiintific Actual. Dana I. Casetti - Yale University. Optical Gravitational Lensing Experiment (OGLE): Science Objectives.

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Proiectele OGLE si ASAS: Performantele Telescoapelor Mici in Contextul Stiintific Actual

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  1. Proiectele OGLE si ASAS: Performantele Telescoapelor Mici in Contextul Stiintific Actual Dana I. Casetti - Yale University Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  2. Optical Gravitational Lensing Experiment (OGLE): Science Objectives • Main Goal ==> Search for dark matter with microlensing phenomena - Boghdan Paczynski (1986 - AJ, 304, 1) • Question: Is dark matter made of many sub-solar mass, compact objects (or MACHOs - MAssive Compact Halo Objects) Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  3. OGLE - A Microlensing Event Classic microlensing event Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  4. OGLE - A Microlensing Event with a Planet Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  5. OGLE - A Microlensing Event with a Planet Planetary microlensing: OGLE 2003-BLG-235/MOA 2003-BLG-53: 22 June 2003 Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  6. OGLE - Survey Areas • Areas to be surveyed should be very dense stellar fields, to built reliable statistics of the events. • Bulge • Magellanic Clouds • Milky Way disk Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  7. OGLE - History of the Program Bohdan Paczynski - Princeton University Andrzej Udalski - Warsaw University Observatory OGLE I - Started in 1992, lasted for 4 years using the existing 1.0 m Swope telescope at Las Campanas, Chile - Science: observed the first microlensing event in 1993 ! first measurement of the optical depth of microlensing events toward the Bulge evidence of a stellar bar in the Bulge - Operations funded by State Committee of Scientific Research to astronomers at Warsaw U. - Limited telescope time! (telescope belongs to Carnegie Institution of Washington) Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  8. OGLE - History of the Program OGLE II • Project for a new telescope started in 1991; contract signed with DFM Engineering Inc. (Longmont, Colorado) in 1992 for the manufacturing of a new 1m-class telescope; site selection in Las Campanas, Chile (agreement signed between Carnegie Institution and Warsaw University). • Construction started in1995, with the telescope enclosure manufactured in Poland • First light in 1996; routine observations in 1997 • Single chip CCD detector. Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  9. OGLE - History of the Program • First light: july 1996 • remote control (from control room and over internet) • fully automated • -main purpose: imaging 1.3 m Warsaw University telescope at Las Campanas, Chile: dome and control building Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  10. OGLE - History of the Program OGLE III - Started in 2001 with a new 8-chip mosaic CCD camera with a field of view of 35x35 arcmin, and a scale of 0.26 “/pix; readout time 98 sec. OGLE IV - Started in March 2010; new 32-chip mosaic camera with a field of view of 1.4 sq. degrees Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  11. OGLE - History of the Program OGLE III and IV ogle.astrouw.edu.pl Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  12. OGLE - Scientific Results • Microlensing events toward the LMC and SMC can not account for dark matter consisting of MACHOs (compact, sub-solar objects) (Wyrzykowski et al. 2009, 2010) • Variable stars: detection of Cepheids (classical and type II), RR Lyrae,  Scuti, eclipsing binaries) • Stellar populations: V, I photometry for color-magnitude diagrams, evidence of a stellar bar in the bulge region • Astrometry: relative proper motions in the Galactic bulge (5 mill. objects); and high proper motion objects toward the Magellanic Clouds • - Other: Kuiper belt objects, extrasolar planets 259 papers as of September 2010 Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  13. The All Sky Automated Survey (ASAS) PROJECT - initiated by B. Paczynski (Princeton University) and G. Pojmanski (Warsaw University Observatory) - funded by KBN (Polish funding agency) and a gift by W. Golden to B. Paczynski GOAL - find and catalog variable stars with V < 14 mag. - a low cost project dedicated to constant photometric monitoring of the entire (available) sky Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  14. The All Sky Automated Survey (ASAS) • EQUIPMENT • Two sites: 1) Las Campanas Obs., Chile (since 1997), • 2) Haleakala, Maui, Hawaii (since 2006) • Each site has two main wide field telescopes observing simultaneously in V and I • It is a fully automated system Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  15. ASAS - System Characteristics www.astrouw.edu.pl/asas/ Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  16. ASAS - Sites The Las Campanas site OGLE 1.3m telescope ASAS system Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  17. ASAS - Sites The Las Campanas site • 2 wide-field (8.5x8.5 deg), 200mm telescopes • 1 narrow-field (2.2x2.2 deg) 250 mm telescope • 1 very-wide (36x25 deg), with a 50mm lens Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  18. ASAS - Sites The Haleakala site Las Cumbres Obs. - Global Telescope Network enclosure hosting the two ASAS telescopes and a 0.4m telescope 0.4m Las Cumbres Obs. telescope ASAS 2 wide-field telescopes Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  19. ASAS - Scientific Results • => Catalog of variable stars • -south of Dec = 28deg • -15 million objects • -10000 eclipsing binaries • -8000 periodic pulsating stars • -31000 irregular variables • Catalog of light curves • Galactic structure from RR Lyrae stars Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  20. ASAS - Scientific Results Szczygiel et al. 2009, AcA, vol 59 RR Lyrae within 4 kpc from the Sun - two distinct groups: Oosterhoff I - metal rich, younger Oosterhoff II - metal poor, older Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

  21. Conclusions Small telescope of the 1m class, well placed and automated can address important scientific questions. Their main advantage is dedicated time to large-area surveys focused on well-posed science objectives. Diaspora in Cercetarea Stiintifica - Bucuresti, 21-24 Sept. 2010

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