Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293l..15s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 293, June 1, 1985, p. L15-L18.
Astronomy and Astrophysics
Astrophysics
25
Cepheid Variables, Hydrogen Clouds, Interstellar Matter, Milky Way Galaxy, Stellar Spectra, Absorption Spectra, Distance, Metallicity, Neutral Atoms, Sodium
Scientific paper
The detection of interstellar Na D absorption lines at a local standard of rest (LSR) velocity of -85 km/s is reported, together with tentative detections of further Na D lines at -133 km/s and -110 km/s, in the spectrum of the RR Lyrae star BT Draconis which lies toward the high-velocity neutral hydrogen complex C (LSR velocity around -115 km/s). This suggests an upper limit of 2.1 kpc on the distance to this high-velocity complex, and indicates that the complex has near-cosmic metallicity. This result strongly favors either a model in which complex C is formed by infalling material in the halo, which has originated in the Galactic disk, or one in which it is part of a large relatively local shell structure.
Blades Chris J.
Cowie Lennox L.
Songaila Antoinette
York Don G.
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