The structure and stellar population of the Galactic nuclear bulge

Details The structure and stellar population of the Galactic nuclear bulge The structure and stellar population of the Galactic nuclear bulge

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96..884t&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Sept. 1988, p. 884-908.

Astronomy and Astrophysics

Astronomy

178

Asymptotic Giant Branch Stars, Galactic Bulge, Galactic Nuclei, K Stars, M Stars, Milky Way Galaxy, Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Horizontal Branch Stars, Main Sequence Stars, Metallicity, Stellar Evolution

Scientific paper

Deep CCD photometry of stars in the Galactic nuclear bulge has been obtained on four lines of sight near l = 0 deg with b from -3.9 deg to -10 deg. Although the steep decline noted in the volume density of the bulge K and M giants cannot be explained by the spheroid of the two-component model, it does, however, match more complicated models that account for the rotation curve of the Galaxy by including a massive central component. For an assumed distance of 7 kpc, a mean stellar age derived from the main-sequence turnoff of 11-14 Gyr is obtained. It is suggested that the evolution of bulge stars on the giant branch may take place at bluer colors or higher luminosities than currently predicted.

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