1. + International Research Experience for Undergraduates Brazil - 2009 SUNY Oswego Advisor: Dr. Shashi Kanbur SUNY Geneseo Alex James & Eamonn Moyer

2. + Cepheid Period-Luminosity Relations and Hubble’s Constant

3. + H-R Diagram

4. + Cepheid Variables Period – Luminosity (P-L) Standard candle Nonlinear P-L for LMC

5. + Using the Cepheid P-L Relation to Estimate Distances Calibrating galaxy

6. + How do we fit in?

7. + Hubble’s constant Ultimate fate and age of universe Dark energy Effects of nonlinearity of Cepheid P-L Relation

8. + Determining Hubble’s Constant Using the Cepheid P-L Relation Calibrate the peak brightness of Type Ia supernovae

9. + Results Big difference for OGLE III Different reddening corrections Still working on uncertainties! Galaxy OGLE II Linear OGLE II Nonlinear OGLE III Linear OGLE III Nonlinear NGC 337075.975.379.386.1 NGC 398273.272.876.381.6 NGC 453673.573.176.681.8 NGC 463977.876.881.489.9

10. + Cepheid Multiphase Period- Luminosity Relations

11. + Multiphase P-L Relationship OGLE III Data Rephasing Instead of simply looking at max, mean, and min light, we analyze the relationship at every phase.

12. + Sigma Clipping Remove obvious outliers(> 5 σ ) from linear fits.

13. + Results Dynamic Non-linear Possible star grouping

14. + Chimera – Robotic Telescope  Written in Python  Antonio Kanaan, Paulo Henrique da Silva  Exposure time calculator

15. + Work  UFSC – Universidade Federal de Santa Catarina ■ Departamento de Física – Grupo de Astrofísica  LNA – Laboratório Nacional de Astrofísica

16. + Play  Sand boarding  Hiking  Sightseeing  Soccer game

17. +