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RISS 인기검색어
- 검색키워드
- 저자 : Lu PHILLIP K. (검색결과 2 건)
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PHOTOMETRY STUDY OF NGC288 ON UVBY BANDPASS
CHEN ROSIE CHANG-HUI,Lu PHILLIP K.,TSAY WEAN-SHUN The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
We present a new photometric study of the globular cluster NGC288 in Stromgren u, v, b, y, and H$\beta$ system. This cluster is known to have an intermediate metallicity but its color-magnitude diagram has a pure blue horizontal branch, which is a signature of metal poor stellar population. We compare our dataset with Bergbusch's (1993) in both field size and CMD to see whether different photometry system would determine the same physical parameters of a cluster. Demarque and Yi's isochrones (1996, private communication) were applied to Bergbusch's dataset, and we obtained distance modulus of (m - M) = 14.9 $\pm$ 0.2, color excess of E(B - V) = 0.03, and age of 1.5$\pm$3 Gyr. Vandenberg's (1985) isochrones for Stromgren system were also applied to Bergbusch's and our data. We find that the isochrone fits to different photometric systems give rather in consist ant solutions. The source of this discrepancy may become clear when the Demarque and Yi's isochrones for Johnson system are converted to those of Stromgren system. We note that Kurucz model atmospheres provide a useful ground for this conversion work as well as theoretical study of Stromgren characteristics of globular cluster stars.
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CCD SNAPSHOTS OF FIELDS IN A STUDY OF THE VERTICAL DISTRIBUTION OF STARS
CHEN ALFRED B.,TSAY WEAN-SHUN,LU PHILLIP K.,SMITH ALLYN,MENDEZ RENE The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
Snapshots of eight SA and standard fields from low to high galactic latitudes were made using the KPNO 0.9m 2K $\times$ 2K CCD with a limiting magnitude from 19 to 22.5. The purpose of this study is to determine the vertical distribution of stars with respect to Galactic latitude and z-distance in comparison with the model simulation between intermediate population to the 'thick disk' component of scale height of a few kpc. Comparison of the preliminary results between observed and model simulation for 3 of the S fields shows good agreement both in V-mag and B- V color distributions. A bimodal distribution in B- V at high galactic latitude seems to be represented by a halo and 'thick disk' dwarf in the blue and by a normal disk dwarf population in the red.
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