Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640013a&link_type=abstract
American Astronomical Society, AAS Meeting #216, #400.13; Bulletin of the American Astronomical Society, Vol. 41, p.856
Astronomy and Astrophysics
Astronomy
Scientific paper
Far-ultraviolet spectra of three sun-like stars have been obtained recently by HST, utilizing its two powerful UV spectrographs: STIS and COS. A 3.6 ks STIS E140M echellegram of nearby, bright Alpha Cen A was taken as part of a joint Chandra-HST program to study the coronal cycles of the solar twin, which has been mired in an activity low-state the past several years, much like the Sun (although recovery for our star apparently is imminent). As part of an HST Cycle 17 Guest Observer program ("SNAPing Coronal Iron"), COS acquired short (20M) G130M snapshots of two young-sun analogs: Hyades G star HD25825 and Pi1 UMa, an early-G dwarf in the Ursa Major Stream, comparable in age to the Hyades. The COS pointing on HD25825 represents the first high-resolution (R=20,000) FUV spectrum of such a faint solar-type dwarf, albeit a hyperactive one befitting its youth (600 Myr). The COS spectra are spectacular, given the brief integrations, rivaling previous STIS efforts (on brighter objects) that required equivalently 20X the exposure depth. A comparison of these spectra show the evolution of chromospheric, transition zone, and even coronal (FeXII 1349 and FeXXI 1354) line profiles from the pinnacles to the depths of activity.
This work supported by grants HST-GO-11687.01 and HST-GO-11839.01 from STScI.
Ayres Thomas R.
Redfield Seth
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