The distance to the Chain A high-velocity cloud complex.

Details The distance to the Chain A high-velocity cloud complex. The distance to the Chain A high-velocity cloud complex.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..428w&link_type=abstract

Astronomy and Astrophysics, v.308, p.428-432

Astronomy and Astrophysics

Astrophysics

7

Ism: Abundances, Clouds, Galaxy: Halo

Scientific paper

We present high-resolution (R~5km/s) NaI and CaII interstellar absorption line spectra observed toward five B stars in the line of sight to the high-velocity cloud complex Chain A. We have failed to detect the presence of any high-velocity (V<-100km/s) interstellar absorption toward these stars. This null detection enables us to place a new lower limit on the distance to the Chain A complex of z>=837+/-200pc, assuming normal gas-phase abundances of NaI and CaII. If this distance determination is typical for other high-velocity clouds, it poses problems for theories that currently argue these clouds interact with the galactic disk.

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