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Astronomy Colloquium

Thursday, February 12, 2015
5:00 AM
411 West Hall

"Magellan/MDM Colloquium"

This week's colloquium will be a series of short talks on recent results from UM observations using the MDM and Magellan facilities.

Speaker: Nuria Calvet

Title: Disk and accretion evolution in the Orion OB1 association

The Orion OB1 association hosts populations spanning ages between 1 and 10 Myrs, the age range in which planets form. We have been carrying out a study of these populations that includes (1) discovering the low and intermediate mass members, (2) finding and characterizing the properties of their protoplanetary disks, (3) measuring the mass accretion rates of these disks and determining its evolution. I will describe how we have used an assortment of instruments in the MDM and Magellan observatories, including MIKE, MagE, and M2FS in Magellan, and CCDS and OSMOS in MDM, to carry out
these studies.

Speaker: Marina Kounkel

Title: Kinematics in the Orion Complex

Previous studies of the kinematics of young stars in the Orion Nebula showed that, while most of the stars follow the velocity structure seen in the dense gas out of which they formed, a significant number of stars exhibit blueshifts on a few km/s with respect to the main population. The magnitude of the blueshifts is significant, as it sufficient for these stars to be gravitationally unbound from the cluster. We obtained high resolution optical spectra using M2FS centered at Halpha and Li I lines in order to confirm the membership of this blue-shifted population and what it could imply in terms of the overarching structure. In addition, we look at NGC 2024, a nearby young cluster that is also a part of the Orion Complex, in order to obtain radial velocities of its stellar population.

Speaker: Keren Sharon

Title: A multiwavelength mass estimate of RCS2327, an extremely massive
galaxy cluster at z=0.7

Nuria Calvet, Marina Kounkel and Keren Sharon