Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..729v&link_type=abstract
Astrophysical Journal - Part 1 (ISSN 0004-637X), vol. 411, no. 2, p. 729-749.
Other
99
Calcium, Clouds, Early Stars, Interstellar Gas, Interstellar Matter, Metal Ions, High Resolution, Ion Charge, Line Of Sight, Line Spectra
Scientific paper
High-resolution absorption measurements of the interstellar Ca II K line observed toward 46 early-type stars in the local ISM (LISM) are presented. Ca II was detected in 36 of the 46 stars with 82 individual cloud components identified. Ca II was detected to most of the stars closer than 50 pc, except in the region of the Galactic quadrant l = 180-270 degrees which also contains the empty line of sight to B CMa at 220 pc. The mean local standard of rest velocity of the 82 Ca II components implies that the LISM clouds are associated with the motion of the solar neighborhood and not the sun. If the present data are combined with other nearby Ca II component velocities taken from the literature, then a cloud centered approximately at l = 90 deg, b = -40 deg moving coherently with the local interstellar wind vector is supported at a significance level of 99 percent. The Ca II data have been combined with Na I data for the same stars to produce a N(Na I)/N(Ca II) ratio for each identified absorption feature. This ratio plotted against the local standard of rest velocities of the clouds shows that the Routly-Spitzer effect exists down to +/- 10 km/s, which supports grain desorption/destruction models that are efficient at returning calcium to the gas phase at these low velocities.
Craig Nathaniel
Vallerga John V.
Vedder Peter W.
Welsh Barry Y.
No associations
LandOfFree
High-resolution CA II observations of the local interstellar medium does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High-resolution CA II observations of the local interstellar medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-resolution CA II observations of the local interstellar medium will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1069381