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[Fizinfo] Csillagda szeminariuma

Chronological Thread 
  • From: ilka AT (Kalman Belane)
  • To: fizinfo AT
  • Subject: [Fizinfo] Csillagda szeminariuma
  • Date: Tue Aug 26 11:00:00 2003
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  • List-id: ELFT HRAD <>


az MTA Konkoly Thege Miklós Csillagászati Kutatóintézete

Elõadó: Piotr Popowski
Max Planck Institut für Astrophysik, Garching b. München

Cim: "Non-microlensing applications of microlensing surveys: Galactic

Microlensing surveys are massive photometric searches covering tens of
square degrees on the sky. As a result, they find many applications that
go far beyond their original purpose. I will illustrate this point with a
few examples. Then I will concentrate on a single issue of Galactic
extinction and present a (V-R)-based reddening map of about 43 square
degrees of the Galactic bulge/bar. The map was constructed using template
image photometry from the MACHO microlensing survey. I will discuss our
new method of reddening estimate that is based on (V-R)-color averages of
the entire color-magnitude diagrams (CMDs). The conversion from the
observed color to the reddening follows from an assumption that CMDs of
all bulge fields would look similar in the absence of extinction.
Consequently, the difference in observed color between various fields
originates from varying contribution of the disk extinction summed along
different lines of sight. Our (V-R)-colors correlate very well with
extinction maps based on other methods and allow us to identify several
low-extinction windows. I will argue that a dusty disk obeying a cosec|b|
extinction law well describes gross properties of the extinction toward
the bulge/bar fields. Finally, I will discuss briefly the physical model
of dust distribution that is implied by observations.

A szeminárium idöpontja: 2003. szeptember 04, csütörtök, 14 óra
Helyszine: MTA Konkoly Thege Miklós Csillagászati Kutatóintézete
1121 Budapest Konkoly Thege M. ut 13-17.

Patkós László s.k.

  • [Fizinfo] Csillagda szeminariuma, Kalman Belane, 08/26/2003

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