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J/A+A/510/A54 NaI and CaII interstellar absorption within 300pc (Welsh+, 2010)
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Beginning of ReadMe :J/A+A/510/A54 NaI and CaII interstellar absorption (Welsh+, 2010)
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New 3-D density maps of NaI and CaII interstellar absorption within 300pc.
Welsh B.Y., Lallement R., Vergely J.-L., Raimond S.
<Astron. Astrophys. 510, A54 (2010)>
=2010A&A...510A..54W
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ADC_Keywords: Stars, nearby ; Abundances ; Interstellar medium
Keywords: solar neighborhood - ISM: atoms - ISM: clouds
Abstract:
We present new high resolution (R>50000) absorption measurements of
the NaI doublet (5889-5895AA) along 482 nearby sight-lines, in
addition to 807 new measurements of the CaII K (3933AA) absorption
line. We have combined these new data with previously reported
measurements to produce a catalog of absorptions towards a total of
1857 early-type stars located within 800pc of the Sun. Using these
data we have determined the approximate 3-dimensional spatial
distribution of neutral and partly ionized interstellar gas density
within a distance-cube of 300pc from the Sun.
Description:
All newly recorded spectra were analyzed by means of a multi-component
line profile-fitting program, in most cases using simultaneous fits to
the line doublets. Normalized absorption profiles were fitted by
varying the velocity, doppler width and column density for all
intervening interstellar clouds. The resulting total column densities
were then used in conjunction with the Hipparcos distances of the
target stars to construct inversion maps of the 3D spatial density
distribution of the NaI and CaII bearing gas.