Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.7207c&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #72.07; Bulletin of the American Astronomical Society, Vol. 31, p.1475
Astronomy and Astrophysics
Astronomy
Scientific paper
We have obtained high resolution (R 80,000), high signal-to-noise (S/N 60-500) Na I λ λ 5889.951, 5895.924 Angstroms absorption spectra towards approximately 70 early-type stars using the ESO Coudé Auxiliary Telescope (CAT) and the Coudé Echelle Spectrograph (CES). These stars lie in projection in the Puppis-Vela region, from l 245o to 275o and b -15o to +5o. The distances of the stars in our sample range from 0.1 to 1 kpc and galactic altitudes (| z| ) range up to 160 pc. We have recently completed a study of the lines of sight to the nearby stars (d < 200 pc), identifying three distinct velocity components. We have used this foreground gas data to identify LISM absorption features in the complex spectra of more distant (d > 200 pc) sight lines. In addition, accurate distances of the target stars derived from Hipparcos parallax measurements enable upper limits to be placed on the distance of the absorbing material. The approximate location of the gas combined with absorption line trends allows for the identification and systematic analysis of the extended structures that intersect the lines of sight including: (1) the 36o-diameter Gum Nebula, an Hα emission object extending over most of Puppis-Vela, (2) the IRAS Vela Shell, a ring-like structure discovered from IRAS Super SkyFlux data which has a radius of 8o centered at (l,b) = (263o,--7o), (3) the Vela Molecular Ridge, a complex of giant molecular clouds in the region l = 260o to 275o and b +/- 2o, at a distance 1 to 2 kpc, and (4) the Vela Supernova Remnant, a roughly spherical 7.3o diameter X-ray bright source centered at (l,b) = (264o,--3o). In this poster, we present an analysis of the absorption line trends characterizing these large structures in Puppis-Vela. This work is supported by NASA contract NAS 5-32985 to the Johns Hopkins University and a GTO grant to the STIS IDT.
Blaauw Adriaan
Cha Alexandra N.
Moos Warren H.
Sahu Srinivasan M.
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