Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8415b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #84.15; Bulletin of the American Astronomical Society, V
Mathematics
Logic
Scientific paper
We present a high spectral resolution absorption line survey of 43 nearby stars in the direction of the future solar trajectory in order to map the structure of our future Local Interstellar Medium (LISM). The LISM may be a contributing factor in Earth's atmospheric chemistry, climate, lightning production, and biologic mutation. A comparative study of the future LISM with our current interstellar environment will provide empirical estimates of the frequency and properties of the various LISM structures the Sun may experience. The sources are between 44 and 380 pc away, and have an angular separation <10º from the solar trajectory direction, with a median value of 4.9º. The spectra were taken with either the McDonald Observatory H.J. Smith Telescope (2.7m) or the Anglo-Australian Telescope (3.9m) with a spectral resolution between 60,000 and 1,000,000. The spectra include the CaII H and K lines and the NaI D doublet resonance lines, and have been flux normalized and telluric absorption features removed from the NaI spectra. Absorption from several interstellar structures are detected, including nearby clouds (<50 pc) and the Local Bubble shell ( 90 pc). The absorption lines in these spectra are currently being used in a calculation of column density as a function of velocity and distance, along these near-solar-trajectory sightlines, ultimately giving us an understanding of the morphology of the LISM which we will be passing through over the next 30 million years.
This work was carried out at the McDonald Observatory REU program supported under NSF AST-0243745. Support for this work was provided by NASA through Hubble Fellowship grant HST-HF-01190.01 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555.
Brooks Ryland T.
Redfield Seth
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