45 citations · 112 across the 6 of their papers we have counts for
6 papers · 1 filter
Multi-color Optical Variability of the TeV Blazar Mrk 501 in the Low-State
A. C. Gupta, W. G. Deng, U. C. Joshi +2
We report results based on the monitoring of the BL Lac object Mrk 501 in the optical (B, V and R) passbands from March to May 2000. Observations spread over 12 nights were carried…
Checking the reliability of equivalent width R23 for estimating metallicities of galaxies
Y. C. Liang, F. Hammer, S. Y. Yin
We verify whether the O/H abundances of galaxies can be derived from the equivalent width (EW) R23 instead of the extinction-corrected flux R23, and eventually propose a method of…
The direct oxygen abundances of metal-rich galaxies derived from electron temperature
Y. C. Liang, F. Hammer, S. Y. Yin +3
We aim to derive the electron temperature Te in the gas of metal-rich star-forming galaxies, which can be obtained from their ratios of auroral lines [O II]7320,7330 to nebular lin…
The study about the revised R23-P method for metallicity estimates based on ~20,000 SDSS galaxies
S. Y. Yin, Y. C. Liang, B. Zhang
We select ~20000 metal-rich star-forming galaxies from the SDSS-DR2 to study the R23-P method suggested by Pilyugin et al. for metallicity estimates. The oxygen abundances derived…
Hardness ratio evolutionary curves of gamma-ray bursts expected by the curvature effect
Y. -P. Qin, C. -Y. Su, J. H. Fan +1
We have investigated the gamma-ray bursts pulses assumed to arise from relativistically expending fireballs. We find, due to the curvature effect, the evolutionary curve of the raw…
The origin of the lead-rich stars in Galactic halo: investigation of the model parameters for the s-process
Wenyuan Cui, Bo Zhang
Several stars at the low-metallicity extreme of the Galactic halo show large spreads of [Pb/hs]. Theoretically, a s-process pattern should be obtained from an AGB star with fixed m…