Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.2104b&link_type=abstract
American Astronomical Society, DPS meeting #42, #21.04; Bulletin of the American Astronomical Society, Vol. 42, p.986
Astronomy and Astrophysics
Astronomy
Scientific paper
We have observed the atmosphere of Mercury with the HIRES spectrograph at the Keck Observatory within the years 1997-2010. An important product of these observations has been the discovery of Ca in the atmosphere (Bida, Killen, and Morgan, 2000), and the subsequent study of its local physical properties and source processes (Killen, Bida, and Morgan, 2005). Here, we report on 4-σ line detections of the metals Al and Fe, and strict upper limits for Ca+, in Mercury's atmosphere as derived from recent Keck/HIRES data sets. A wide range of compositional models, from refractory to volatile-rich, predict significant mantle abundances for these metals. We present the spatial dependence of the Al, Fe, and Ca+ abundance upper limits, and discuss possible source processes for these metals. The Ca+ upper limits from Keck/HIRES will be compared with the ion's measurements made with the MASCS instrument onboard MESSENGER (Vervack et al, 2010).
Bida Thomas A.
Killen Rosemary Margaret
Morgan Thomas H.
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