Observations of early-type stars at high galactic latitudes

Details Observations of early-type stars at high galactic latitudes Observations of early-type stars at high galactic latitudes

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...155..333k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 2, Feb. 1986, p. 333-338. SERC-supported research.

Astronomy and Astrophysics

Astrophysics

55

Early Stars, Galactic Evolution, Spectral Line Width, Stellar Composition, Stellar Spectra, Gravitational Fields, Radial Velocity, Stellar Atmospheres, Thermodynamic Equilibrium

Scientific paper

Using equivalent widths and line profiles measured from high resolution AAT spectra in conjunction with model atmosphere calculations, it is shown that a sample of eleven high galactic latitude early-type stars are normal, distant objects. Stellar velocities in the z-direction determined from the spectra, coupled with the galactic gravitational field g(z), allow the times the stars would have taken to reach their present positions if they were ejected from the disc to be derived. A comparison of these times with the evolutionary ages indicate that at least four of the stars have been formed in situ, possibly from galactic fountain material.

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