Jessica R. Lu Institute for Astronomy University of Hawaii

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Proper motions are a powerful tool for identifying cluster members. Commonly used in globular clusters. High spatial resolution optical capabilities of HST. Massive young clusters require better astrometric precision. Massive young clusters require infrared astrometry. Anderson+ 2006
Successful pilot project for W51. Done in 1 year with Keck OA (55 mas resolution). Need bigger FOV to cover whole cluster/GMC. Need spectroscopy to calibrate masses. Lu et al. in prep
Page 1 and 2: Stars in formation in motion Jessic
Page 3 and 4: 10 5 M sun 10 4 M sun 10 3 M sun
Page 5 and 6: Massive young clusters are difficul
Page 7 and 8: Current AO systems have too small F
Page 9: Stars in formation in motion
Page 13 and 14: Currently, relative astrometry is p
Page 15 and 16: Slides Internal Save As: dynamics j
Page 17 and 18: Masses of stars, brown dwarfs, and
Page 19 and 20: Astrometric microlensing can probe
Page 21 and 22: Astrometric microlensing can probe
Page 23 and 24: Astrometry is relevant to many addi

Jessica R. Lu Institute for Astronomy University of Hawaii

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