선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- An iterative method was applied to remove neighboring stars of selected PSF stars, so that we were able to achieve appropriate PSFs for each frame. Aperture correction was applied by using DAOGROW task and the result was used to correct the measured PSF-based magnitudes for every stars in the frame. Airmass corrections and the photometric transformations were then applied to obtain the BV standard magnitude of stars.
- In this paper, we construct the V band luminosity function (LF) of the RGB stars in NGC 1904 from the BV CCD photometry obtained with the BOAO 1.8m telescope to detect the RGB bump and tip, from which we evaluate the distance modulus of the cluster. The magnitude levels of the RGB bump and the RGB tip in a stellar system contain crucial astrophysical significance of the low- mass stellar evolution and the cosmic distance scale of the system.
- 15, is slightly larger than those of previous measurements. This indicates that further accurate calibrations for the distance measurements from the RGB bump and the other methods are needed from the photometric and theoretical analyses on the RGB bump.
이론/모형
- Multiple aperture photometry was performed on each standard star by using the PHOTOMETRY task in the DAOPHOT II (Stetson 1987). Total magnitudes of standard stars were then calculated by applying the growthcurve analysis of the DAOGROW task (Stetson 1990). These magnitudes were corrected for the exposure time of each frame and the extinction coefficient, which was estimated from the data of time series observations of an arbitrary selected sky region.
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