2019 HotSci at STScI
Space Telescope Science Institute (STScI)
3700 San Martin Drive
Baltimore, MD 21218
2:45 PM - 4:00 PM
Featuring Tracy Beck on T Tau: An Enigmatic Eponym and Steve Goldman on Discovering High Redshift AGB Analogs in Nearby Metal-Poor Dwarf Galaxies.
All talks are held on Wednesdays in the STScI John N. Bahcall Auditorium at 3:00 p.m. preceded by refreshments at 2:45 p.m.
Speaker: Tracy Beck
Title: T Tau: An Enigmatic Eponym
Abstract: T Tauri is the eponymous young sun-like star, and observations over the past two decades have revealed that it is a remarkable young triple star system. In this talk, I will present the historical significance of T Tauri and its role in defining this stellar classification, summarize our current knowledge of the system characteristics, place it in the context of young multiple stars, and emphasize the reasons why T Tau will be a prime candidate for multi-wavelength temporal monitoring in the coming decade. T Tauri has a strong potential to reveal new and exciting information about the astrophysics of mass accretion+outflow and early dynamical evolution in young multiple star systems.
Speaker: Steve Goldman
Title: Discovering High Redshift AGB Analogs in Nearby Metal-Poor Dwarf Galaxies
Abstract: The effects of metallicity on both the dust production and mass loss of evolved stars have consequences for stellar masses, stellar lifetimes, the progenitors of core-collapse supernovae, and the origin of dust in the ISM. With the DUST in Nearby Galaxies with Spitzer (DUSTiNGS) survey, we have discovered samples of dusty evolved AGB stars out to the edge of the Local Group, reaching metallicities down to 0.6% solar. This makes them the nearest analogs of AGB stars in high-redshift galaxies. We present the dustiest AGB stars in 10 galaxies from the DUSTiNGS survey and show how the infrared Period-Luminosity (P-L) relation is affected by dust and by metallicity. Using HST and Spitzer photometry we have also discovered both carbon and oxygen-rich AGB candidates in Leo P, the most metal-poor gas-rich galaxy that we can resolve with current instruments. These detections have large implications for the ability of both types to produce dust in metal poor environments and at high redshift, and the ability to use the Mira P-L relation as a distance indicator.