The initial mass function of the young cluster NGC 1818 in the Large Magellanic Cloud

Details The initial mass function of the young cluster NGC 1818 in the Large Magellanic Cloud The initial mass function of the young cluster NGC 1818 in the Large Magellanic Cloud

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295...54w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 1, p. 54-62

Astronomy and Astrophysics

Astrophysics

36

Astronomical Models, Globular Clusters, Magellanic Clouds, Stellar Color, Stellar Luminosity, Stellar Mass, Astronomical Photometry, Charge Coupled Devices, Chronology, Color-Magnitude Diagram, Metallicity, Star Clusters

Scientific paper

BV CCD photometry of the young globular cluster NGC 1818 in the Large Magellanic Cloud (LMC) was used to determine the age of this object and the slope of its initial mass function (IMF). Isochrones from four different stellar evolutionary models were fitted to the color magnitude diagram (CMD). Models including the effect of convective core overshooting give an age of 40 Myr for NGC 1818 whereas those with a classical treatment of convective stellar cores give an age of about 20 Myr. The luminosity function has a slope of gamma = 0.29 +/- 0.02 for all blue stars with -5.7 is less than MVis less than +2.3. Using appropriate isochrones the magnitudes of the main sequence stars were transformed to the corresponding masses and the slope of the IMF was determined. The resulting IMF slopes show some dependence on the input physics of the models but they are equal within the errors. The mean value for the slope of the IMF in the mass range 2 - 8 solar mass is x = 1.1 +/- 0.3. This value is in good agreement with the results for other LMC clusters and the solar vicinity (x = 1.35).

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