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Alfred Bing-Chih Chen

Publications and source records attributed to Alfred Bing-Chih Chen.

2 recordsLinked to original sources

Compact Scintillator Array Detector (ComSAD) for sounding rocket and CubeSat missions

The development of CubeSat and more frequent launch chances of sounding rockets are a total game changer to the space program, and it allows us to build space instruments to be more achievable and affordable. Therefore, it gives us a good opportunity to build a small cosmic ray detector which has capabilities to measure the flux, direction, and even energy of cosmic rays at the height above the limitation of balloon experiments, and it may open a new door for building a constellation of detectors to study cosmic ray physics. Compact Scintillator Array Detector (ComSAD) is dedicated for the sounding rocket mission of Taiwan's National Space Organization. In paper, we present the idea, design, and performance of ComSAD which is also suitable for CubeSat missions in the future.

physics.ins-det

The metallicity distribution of F/G dwarfs derived from BATC survey data

Based on synthetic flux spectra calculated from theoretical atmospheric models, a calibration of temperature and metallicity for the dwarfs observed in the Beijing-Arizona-Taiwan-Connecticut (BATC) multicolor photometric system is presented in this paper. According to this calibration, stellar effective temperatures can be obtained from some temperature-sensitive color indices. The sample stars have colors and magnitudes in the ranges 0.1 5 kpc, it could not be interpreted according to the different contributions from the three components because of the large uncertainty. So it is possible that there is little or no gradient for z>5 kpc. The overall distribution shows a metallicity gradient d[Fe/H]/dz=-0.17+-0.04dex/kpc for z<15 kpc.

astro-ph