FLASH Talks: Observations of multiple stars from the ground and space & Astrometric binaries in Gaia
Friday, 25 March 2022 noon — 1 p.m. MST
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FLASH Talks
Andrei Tokovinin (NOIRLab) & Zephyr Penoyre (Cambridge)
Andrei Tokovinin (NOIRLab)
Observations of multiple stars from the ground and space
New "windows" on hierarchical stellar systems are opened by space facilities such as TESS and Gaia, bringing this field to the forefront
of research. However, ground-based observations (photometry, spectroscopy, high-resolution imaging) are an essential complement to the space surveys. Examples of recently discovered unusual hierarchies and some results of long-term spectroscopic and speckle programs will be given. Architecture of stellar hierarchies and their statistics help to understand the formation of stellar systems.
New "windows" on hierarchical stellar systems are opened by space facilities such as TESS and Gaia, bringing this field to the forefront
of research. However, ground-based observations (photometry, spectroscopy, high-resolution imaging) are an essential complement to the space surveys. Examples of recently discovered unusual hierarchies and some results of long-term spectroscopic and speckle programs will be given. Architecture of stellar hierarchies and their statistics help to understand the formation of stellar systems.
Zephyr Penoyre (Cambridge)
Astrometric binaries in Gaia
A thousand-fold increase in the number of stars and the precision with which we can observe their motion allows us to see previously rare phenomenon in great numbers and detail. Astrometric binaries are a fantastic example of this - ~half of all stars are binaries and precise astrometry enables us to detect a huge number of these, with periods from months to decades. I’ll talk about the different astrometric signals binary stars produce, how we can identify them now, and how those observations will evolve and improve over the lifetime of the Gaia survey.FLASH Talks are scientific talks for the staff at NOIRLab and the University of Arizona's Steward Observatory.
If you or a collaborator are interested in presenting at FLASH please get in touch. All FLASH talks are virtual for the foreseeable future, so feel free to suggest speakers from outside of Tucson!