Thomas R. Ayres (Center for Astrophysics and Space Astronomy of the University of Colorado, Boulder, U.S.A.)

Cool Stars: So Hot Right Now
When Oct 10, 2012 from 10:30 AM to 12:00 PM
  • Special Seminar
Where SH, Lecture hall
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Space Telescope Imaging Spectrograph (STIS) was the workhorse for cosmic ultraviolet spectroscopy from its 1997 installation in Hubble until its untimely failure in 2004. In fact, with the effective loss of the Far-Ultraviolet Spectroscopic Explorer in 2006, the study of solar-like activity on other stars -- advantageously viewed in the UV -- at that time entered an observational “Dark Ages.” Today, stellar UV astronomy is enjoying a welcome rejuvenation, thanks to Hubble Servicing Mission 4 in May 2009, which not only installed the super-sensitive Cosmic Origins UV spectrograph (COS), but also miraculously repaired STIS. This talk will explore some of the projects that have been carried out with both Hubble UV spectrographs over the past several years post-SM4, focusing on cool stars; including the Advanced Spectral Library (ASTRAL), which has obtained full coverage high-resolution UV “atlases” of eight iconic late-type stars; and the so-called COCOA-PUFS joint HST/Chandra UV/X-ray campaign on the enigmatic ultra-fast rotating yellow giant, FK Comae Berenices.