Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...490..267r&link_type=abstract
Astrophysical Journal v.490, p.267
Astronomy and Astrophysics
Astronomy
7
Galaxy: Kinematics And Dynamics, Ism: Kinematics And Dynamics, Stars: Abundances, Stars: Early-Type, Stars: Individual Alphanumeric: Ls 4825
Scientific paper
We present high-resolution spectroscopic observations of LS 4825, a V = 12 B-type star in the Galactic center direction. On the basis of its stellar and interstellar spectra, we infer that it is likely to be a young supergiant at a distance of 21 +/- 5 kpc, and hence lying on the far side of the Galaxy. Adopting this hypothesis, a differential abundance analysis shows LS 4825 to have a chemical composition that is consistent with local B-type supergiants. These observations therefore represent the first detailed investigation of a star on the far side of the Galactic center. We trace multiple interstellar components in Ca II K and Na I D spectra, with velocities -206 <= vlsr <= +93 km s-1. We consider the likely origin of this gas and find that some components appear to trace matter lying close to the Galactic center. We discuss the possible use of such sight lines in furthering our understanding both of the nature of gas around the Galactic center and of the abundance gradient of the Galaxy.
Dufton Philip L.
Keenan Francis P.
Lennon Daniel J.
Ryans S. I. R.
Sembach Kenneth Russell
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