[seminar] Kolokvij FO, Southworth

[hbuljan at phy.hr]

Poštovani kolege,

    iduću srijedu, s početkom u 14.15 satu, u sobi F201,
Dr. John Southworth održati će predavanje naslovljeno
"Breaking the 1 mmag barrier". Sažetak predavanja
nalazi se u nastavku poruke,

Srdačan pozdrav
Hrvoje Buljan

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KOLOKVIJ FIZIČKOG ODSJEKA
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Vrijeme:   srijeda 10. 12. 2008., 14:15 sati (točno)
Mjesto:     Fizički odsjek, Bijenička c. 32, predavaonica F201

             Breaking the 1 mmag barrier

                   Dr. John Southworth
  Department of Physics, University of Warwick, Coventry CV7 4AL, UK


Astronomical CCD photometry habitually gets near to the 1 mmagnitude
(0.1%) noise level, but very rarely breaks through this barrier. I discuss
how this can be done, and why it is worth trying. An elegant option is to
go into space: I present a light curve of a bright eclipsing binary
containing 30000 datapoints with a point-to-point scatter of 0.3 mmag. A
less elegant option is brute-force defocussing of ground-based telescopes,
which may be the way forward to studies of transiting extrasolar planet. I
present pioneering observations of WASP-4 and WASP-5 which use major
defocussing (PSFs covering thousands of pixels) to approach noise levels
of 0.5 mmag per point.


				Voditelj seminara FO
				Hrvoje Buljan, hbuljan at phy.hr
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