New light on faint stars. VI - Structure and evolution of the Galactic spheroid

Details New light on faint stars. VI - Structure and evolution of the Galactic spheroid New light on faint stars. VI - Structure and evolution of the Galactic spheroid

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207..223g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, March 1, 1984, p. 223-240.

Other

148

Galactic Structure, Milky Way Galaxy, Subdwarf Stars, Astronomical Photometry, Spheroids, Spiral Galaxies, Stellar Evolution

Scientific paper

Recent observations of the structure of the Galactic spheroid are analyzed and confirm the existence of a very flattened component of the spheroid. This population contains about 2 percent of the stars in the solar neighborhood but is not so identified in previous studies of high-velocity subdwarfs. The observations are interpreted in a model in which the stars which dominate an outer spheroid formed before or early in the Galactic colapse. Debris from this period collapsed into a pressure supported disc with temperature about 10,000 K, corresponding to a z velocity dispersion of about 60 km/s. Those stars which formed in this disc make up the inner, rotating, flattened spheroid, while the remnant of this 'thick disk' and metal-rich ejecta from the other spheroidal stars dissipationally cooled into the Galactic thin disc. Analyses of the Galactic structure taken into account include: the Basle photometric survey, the Stromgren photometric survey, the Berkeley kinematic and photometric surveys, deep photometric surveys, the UK Schmidt photometric survey, and X-ray background surveys.

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