Distance to the anti-center shell

Details Distance to the anti-center shell Distance to the anti-center shell

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.118..531k&link_type=abstract

(IAU, Asian-Pacific Regional Meeting, 3rd, Kyoto, Japan, Sept. 30-Oct. 5, 1984) Astrophysics and Space Science (ISSN 0004-640X),

Astronomy and Astrophysics

Astrophysics

12

Galactic Structure, Hydrogen Clouds, Milky Way Galaxy, Visual Observation, Calcium, Distance, Radial Velocity, Spin Temperature

Scientific paper

Heiles (1984) has identified a large angular diameter (≡30°), anomalous velocity H I structure in the anti-center region of the Galaxy. The distance to this structure is the key to understanding of the energetics and, hence, the origin. The authors report the absence of any anomalous velocity Ca K absorption features in high sensitivity echelle spectra towards 17 stars located within the boundaries of this structure. They conclude that the structure is definitely beyond 500 pc and barring usually low Ca II abundance is more distant than 2.5 kpc. This result supports the hypothesis that the anti-center structure is the result of collision of high-velocity clouds with the galactic H I disk.

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