Optical and 21-cm observations of high-velocity gas towards subdwarfs in the halo and early-type stars in the disk

Details Optical and 21-cm observations of high-velocity gas towards subdwarfs in the halo and early-type stars in the disk Optical and 21-cm observations of high-velocity gas towards subdwarfs in the halo and early-type stars in the disk

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..261c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 261-270

Astronomy and Astrophysics

Astrophysics

12

Accretion Disks, Dwarf Stars, Early Stars, Galactic Halos, High Speed, Interstellar Gas, Molecular Clouds, Absorption Spectra, Astronomical Spectroscopy, Calcium, Emission Spectra, Kinematics, Optical Measurement, Radio Telescopes, Sodium

Scientific paper

We present a study of high-velocity gas in the direction of 13 halo sub-dwarfs located at absolute value of z approximately equals 0.5-2 kpc and of 8 early-type stars in the Galactic disk at d approximately equals 1-4 kpc. For each line of sight of our sample we collected Ca II and Na I absorption spectra with the 2.5-m Isaac Newton Telescope at La Palma (Spain) and H I 21-cm emission profiles with the 100-m radiotelescope at Effelsberg (Germany). The faint sub-dwarfs (mv approximately equals 11-14) are observed for the first time at relatively high spectral resolution (approximately equals 25-30 km/s) in the optical. By comparing the optical absorptions (or upper limits) with the 21-cm emissions, we constrain the distances to the concentrations of neutral gas at high velocity named Complex C, Complex H, and for high velocity gas located between the Cohen Stream and the Magellanic Stream. We find new evidence for gas at intermediate velocity in the halo and in the disk of our Galaxy.

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