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NEAR-INFRARED PHOTOMETRY OF METAL RICH GLOBULAR CLUSTER M71
경재만,변용익,천문석 한국우주과학회 1997 Journal of Astronomy and Space Sciences Vol.14 No.2
We have carried out JK near-infrared photometry for the central region of the metal rich globular cluster M71, whose (K, J - K) color-magnitude diagram is presented here. Using two independent methods we derive the distance modulus to M71, 12.89 and 12.86 $pm0.12$ respectively. The former is derived using the HB luminosity $M_{Ko}$(HB) = -1.15 for globular clusters having metallicity between -1.0 to -0.3 (Kuchinski et al. 1995). The latter is derived through a comparison with IR photometry of stars in the similar metallicity cluster 47 Tuc. We also estimate the reddening to M71, E(J - K) = 0.13, based on E(B - V) = 0.04 of 47 Tuc.
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경재군,곽묘묘,장혜영,송관결,장소혜,공효연,리려 한국피부과학연구원 2024 아시안뷰티화장품학술지 Vol.22 No.2
Purpose: This paper aims to qualitatively and quantitatively analyze the differences between the main chemicals in different licorice and fermented licorice (FL) extracts and their in vitro skin care activities and active ingredients. To evaluate the effect of fermentation on the efficacy of licorice. Methods: The DPPH free radical scavenging activity, mushroom tyrosinase activity, tyrosinase activity of B16F10 cells, and melanin synthesis inhibition activity of different extracts treated by fermentation and different extracts without fermentation treatment were evaluated. The effects of ethyl acetate components (EaF) including glycyrrhizin, isoglycyrrhizin, liquiritoside, isoliquiritigenin and glycyrrhizin ketone A on melanin synthesis were tested in vitro. Further assessment of FL at stromal metalloproteinase-1 (MMP-1) levels in human dermal fibroblasts (HDF). Results: Glycyrrhizin, isoglycyrrhizin, liquiritoside, isoliquiritigenin were improved in FL, and the antioxidant and MMP-1 inhibitory activities of FL controls were significantly increased. Conclusion: After fermentation, the anti-aging effect of licorice was greatly improved, indicating that the fermentation process had a good effect on improving the efficacy of licorice.
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박병곤,경재만,김영수,박귀종,박찬,여아란,육인수,이성호,장정균,천무영 한국우주과학회 2009 한국우주과학회보 Vol.18 No.2
한국천문연구원은 2009년부터 거대 마젤란 망원경 (GMT: Giant Magellan Telescope)의 10% 지분 확보를 주요 골자로 하는 대형광학망원경 개발사업을 수행하고 있다. 이 발표에서는 거대망원경 시대를 겨냥한 키사이언스 그룹의 육성, 첨단 광기계기술 확보를 위한 부경제작기술 개발, GMT 관측기기 제작 수주를 위한 국제공동개발사업 등 개발사업의 각종 활동에 대한 2009년 사업 내용 및 2010년 계획에 대하여 발표한다.
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BVI PHOTOMETRIC STUDY OF THE OLD OPEN CLUSTER RUPRECHT 6
김상철,경재만,박홍수,한일승,이준협,문대식,이영대,김성재 한국천문학회 2017 Journal of The Korean Astronomical Society Vol.50 No.3
We present a $BVI$ optical photometric study of the old open cluster Ruprecht 6 using the data obtained with the SMARTS 1.0 m telescope at the CTIO, Chile. Its color-magnitude diagrams show the clear existence of the main-sequence stars, whose turn-off point is located around $V \approx 18.45$ mag and $B-V \approx 0.85$ mag. Three red clump (RC) stars are identified at $V = 16.00$ mag, $I = 14.41$ mag and $B-V = 1.35$ mag. From the mean $K_s$-band magnitude of RC stars ($K_s=12.39 \pm 0.21$ mag) in Ruprecht 6 from 2MASS photometry and the known absolute magnitudes of the RC stars ($M_{K_S} = -1.595 \pm 0.025$ mag), we obtain the distance modulus to Ruprecht 6 of $(m-M)_0 = 13.84 \pm 0.21$ mag ($d=5.86 \pm 0.60$ kpc). From the $(J-K_s)$ and $(B-V)$ colors of the RC stars, comparison of the $(B-V)$ and $(V-I)$ colors of the bright stars in Ruprecht 6 with those of the intrinsic colors of dwarf and giant stars, and the PARSEC isochrone fittings, we derive the reddening values of $E(B-V) = 0.42$ mag and $E(V-I) = 0.60$ mag. Using the PARSEC isochrone fittings onto the color-magnitude diagrams, we estimate the age and metallicity to be: $\log(t)=9.50 \pm 0.10$ ($t=3.16 \pm 0.82$ Gyr) and [Fe/H] $= -0.42 \pm 0.04$ dex. We present the Galactocentric radial metallicity gradient analysis for old (age $> 1$ Gyr) open clusters of the Dias et al. catalog, which likely follow a single relation of [Fe/H] $=(-0.034\pm0.007) R_{\mathrm{GC}} + (0.190\pm0.080)$ (rms = 0.201) for the whole radial range or a dual relation of [Fe/H] $=(-0.077\pm0.017) R_{\mathrm{GC}} + (0.609\pm0.161)$ (rms = 0.152) and constant ([Fe/H] $\sim -0.3$ dex) value, inside and outside of $R_\mathrm{GC} \sim 12$ kpc, respectively. The metallicity and Galactocentric radius ($13.28\pm 0.54$ kpc) of Ruprecht 6 obtained in this study seem to be consistent with both of the relations.
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