Dusty Massive Evolved Stars In the Nearby Universe

Stephen J. WilliamsNational Observatory of Athens

June 23, 2014 1

Collaborators

Alceste Bonanos (NOA)Nikolay Britavskiy (NOA)

Michalis Kourniotis (NOA)Jose Prieto (Princeton)Andrea Mehner (ESO)

William Blair (JHU)Brad Whitmore (STScI)

2

SN2009ip

3Mauerhan et al. 2013LBV Variability

LBV Outbursts

4

Szcz

ygie

ł et a

l. 20

10

5Ekström et al. 2012

6

7

Bonanos et al. 2009

8

Khan et al. 2013

9

10Britavskiy et al. 2014

Conclusions, Work to Do

• Pan-STARRS1 – Variability to ID evolved massive stars– Bandpass diagnostics

• Spectroscopic follow-up• Census of objects across metallicity• SN progenitor groundwork

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References

• Mauerhan et al. 2013, MNRAS, 430, 1801• Szczygieł et al. 2010, AJ, 140, 14• Ekström et al. 2012, A&A, 537, 146• Bonanos et al. 2009, AJ, 138, 1003• Khan et al. 2013, ApJ, 767, 52• Britavskiy et al. 2014, A&A, 562, 75

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