The nature of the Galactic Bulge

Details The nature of the Galactic Bulge The nature of the Galactic Bulge

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235.1025h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Dec. 15, 1988, p. 1025-1047.

Astronomy and Astrophysics

Astronomy

57

Galactic Bulge, Galactic Structure, Infrared Astronomy, Milky Way Galaxy, Astronomical Catalogs, Cool Stars, Spatial Distribution, Stellar Mass, Variable Stars

Scientific paper

By modelling the IRAS sampling properties the authors have deduced the period distribution of the long-period variable stars which outline the Galactic bulge in the IRAS Point Source Catalog. The majority of these sources have periods from ≡400 day to ≡1400 day. The derived period distribution corresponds to a main sequence initial mass in excess of ≡1.3 M_sun;, and a corresponding age of less than about 10 Gyr, on a scale on which the globular clusters have an age of ≡16 Gyr. Thus the centrally concentrated stellar distribution making up the IRAS bulge comprises an intermediate age population of stars which is not obviously part of the extended stellar spheroid.

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