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SUMMARY:Photometric Distances Near and Far in the Age of Gaia - Josh Speag
 le (Harvard)
DTSTART:20190403T121500Z
DTEND:20190403T124500Z
UID:TALK122227@talks.cam.ac.uk
CONTACT:Catrina Diener
DESCRIPTION:I will discuss some recent work combining Gaia parallax measur
 ements with broadband SED modelling to derive stellar properties (distance
 s\, reddenings\, etc.). \nIn the first part of the seminar\, I will presen
 t results from recent work where we were able to use this approach to deri
 ve probabilistic distance and reddening estimates to tens of thousands of 
 stars in order to estimate robust distances to local molecular clouds. Our
  results appear to reveal a ~1.5kpc-long structure off of the local arm an
 d the plane that connects several well-known star-forming regions.\nIn the
  second part of the seminar\, I will discuss recent work trying to extend 
 this approach to more complex stellar models in order to try and photometr
 ically identify and characterize giants in the halo. Preliminary compariso
 ns with new spectral data from he H3 Survey suggest it is possible to reco
 ver reasonable log(g) estimates from photometry with low-SNR Gaia parallax
  measurements.
LOCATION:Large Martin Ryle Seminar Room\, KICC
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