Evidence for recent star formation in the galactic halo

Details Evidence for recent star formation in the galactic halo Evidence for recent star formation in the galactic halo

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986iraj...17..483k&link_type=abstract

(Astronomical Science Group of Ireland, Meeting, Queen's University of Belfast, Northern Ireland, Apr. 4, 1986) Irish Astronomic

Astronomy and Astrophysics

Astronomy

1

Early Stars, Galactic Structure, Milky Way Galaxy, Star Formation, Stellar Composition, Abundance, B Stars, Stellar Spectra

Scientific paper

Observational data for PHL 346 obtained with the 2.5 m Issac Newton telescope on August 1985 are studied. Measured stellar Stromgren colors, hydrogen-line profiles, and helium and metal-line equivalent widths are compared with those predicted by local thermodynamic equilibrium model-atmosphere calculations. Effective temperature, surface gravity, microturbulent velocity, and helium and metal abundances for the star are derived. A mass of 13 + or - 2 solar masses, a lifetime of 11 x 10 to the 6th yr, a distance from the galactic plane of 8.7 + or - 1.5 kpc, and a velocity in the z direction of +56 + or - 10 km/s are calculated for the star. The data reveal that the star was not ejected from the galactic plane, but that it formed out of galactic fountain gas at about 6 kpc from the disc.

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