The evolved stellar content of Holmberg IX

Details The evolved stellar content of Holmberg IX The evolved stellar content of Holmberg IX

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1607d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1607-1613.

Astronomy and Astrophysics

Astronomy

20

Asymptotic Giant Branch Stars, Dwarf Galaxies, Magellanic Clouds, Stellar Evolution, Charge Coupled Devices, Color-Magnitude Diagram, Star Formation Rate, Stellar Luminosity

Scientific paper

V and I CCD images obtained with the Canada-France-Hawaii Telescope are used to investigate the evolved stellar content of the dwarf galaxy Holmberg IX (DDO 66). The number of evolved stars in this galaxy increases markedly at magnitudes fainter than I of about 21.5 and, assuming a distance modulus of 27.5, this is suggested to be a consequence of a decrease in the rate of star formation roughly 50 million yr ago. The luminosity function of asymptotic giant branch stars in Ho IX is in good agreement with that measured in the LMC, suggesting that the intermediate-age star-formation history of this Ho IX field is similar to that in the LMC.

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