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  • Other Sources  (5)
  • ASTROPHYSICS  (5)
  • 1985-1989  (5)
  • 1980-1984
  • 1950-1954
  • 1
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    The stellar content of rich young clusters in the Large Magellanic Cloud (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Initial mass functions (IMFs) of six young rich clusters in the LMC have been determined from star counts on photographic plates with different limiting magnitudes. Over the range of stellar masses from 1.5 to 6 solar masses, very flat IMF slopes between -0.2 and 0.8 are found. Possible explanations for the discrepancy between these results and those of Mateo (1988), who found step IMFs for a different sample of clusters in the Magellanic Clouds, are considered, and no obvious ones are found. The flat IMFs imply smaller mass-to-light ratios than previously assumed and reinforce previous conclusions that the clusters have unbound halos. Flat IMFs also imply that stellar winds would have been very important in restructuring and expelling the gas from a protocluster and that there would have been many supernovae early in the history of a supercluster.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 336; 734-751
    Format: text
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  • 2
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    Core expansion in young star clusters in the Large Magellanic Cloud (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The core radii of 18 rich star clusters in the LMC with ages from 10 Myr to 1 Gyr. Data for an additional 17 clusters with ages from 1 Myr to 10 Gyr are available in the literature. The combined sample shows that the core radii increase from about 0 to about 5 pc between about 1 Myr and 1 Gyr, and then begin to decrease again. The expansion of the cores is probably driven by mass loss from evolving stars. Models of cluster evolution show that the rate of increase in core radius is sensitive to the slope of the initial mass function. The observed core radius-age relation for the LMC clusters favors an intial mass function with slope slightly flatter than the Salpeter value.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 347; L69-L71
    Format: text
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  • 3
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    The internal velocity dispersions of three young star clusters in the Large Magellanic Cloud (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The radial velocities of 11 to 37 stars have been measured in each of three rich young star clusters in the LMC: NGC 1866, NGC 2164, and NGC 2214. A thorough analysis of the observational errors and contamination by field stars is presented along with a new method to assign confidence limits to the velocity dispersions. Limits are set to the central densities, total masses, and mass-to-light ratios of the clusters, and the question of whether they have unbound halos is addressed. From the small velocity dispersion and large radial extent of NGC 1866, it is inferred that the cluster is not yet tidally limited by the LMC.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 347; 201-213
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  • 4
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    The globular cluster system of M31 (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Previous data on globular cluster candidates in M31 have been studied in order to identify a large sample of clusters with reliable UBV photometry and independent reddening estimates. The distribution of the intrinsic colors of the M31 globular clusters is similar to that of the Galactic globulars. While the flattening and kinematics of the system of metal-rich clusters suggest a disk, the more metal-poor clusters reveal little evidence for rotation. It is noted that the flattening of the system of metal-poor and intermediate clusters resembles that of the M31 spheroid, and that the effective radius of the intermediate system also resembles that of the spheroid.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 333; 594-610
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  • 5
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    LMC clusters - Age calibration and age distribution revisited (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The empirical age relation for star clusters in the Large Magellanic Cloud presented by Elson and Fall (1985) are reexamined using ages based only on main-sequence turnoffs. The present sample includes 57 clusters, 24 of which have color-magnitude diagrams published since 1985. The new calibration is very similar to that found previously, and the scatter in the relation corresponds to uncertainties of about a factor of 2 in age. The age distribution derived from the new calibration does not differ significantly from that derived in earlier work. It is compared with age distributions estimated by other authors for different samples of clusters, and the results are discussed.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 96; 1383-138
    Format: text
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