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A PHOTOMETRIC AND SPECTROGRAPHIC STUDY OF BP PEGASI
KIM, CHULHEE,McNAMARA, D. H.,JONER, MICHEL D. 全北大學校 基礎科學硏究所 1991 基礎科學 Vol.14 No.1
New photometric(uvbyβ)and spectrographic observations of the dwarf Cepheid BP Peg are described. A reddening value, E(b-y) = 0^m.067, is derived from the photometry. Intrinsic(b-y), m_1 and c_1 values used in conjunction with a model-atmosphere grid yield a mean effective temperature, <T_eff> = 7470 K, a mean surface gravity, <log g> = 3.85, and [Fe/H] = -0.08. The pulsation theory and stellar model sequences yield M_bol = 1^m.4, a mass = 1.85?? , and age of 1.3 × 10^9yrs. The radial-velocity data indicate a mean radial velocity of -30㎞ s^-1 and a total velocity range of 36㎞ s^-1.
A PHOTOMETRIC AND SPECTROGRAPHIC STUDY OF SX PHOENICIS
KIM, CHULHEE,D.H.McNAMARA,C.G.CHRISTENSEN 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-
Simultaneous photometric (uvbyβ) and spectrographic observation of SX Phe are described. Analysis of the light and velocity frequency spectra are performed. It is shown that all frequencies detected are harmonics or combinations of the fundamental and first harmonic frequencies. Intrinsic (b-y) and c_1 values used in conjunction with a model-atmosphere grid appropriate for a star with [M/H]=-1.0 yields <T_eff> = 7630 K and <log g> = 3.90. Standard evolutionary models indicate the mass is 1.13 ?? and <M_v> value is ± 2.9. The radial-velocity data indicate a mean radial velocity of -37 km/s and a total range of 38 km/s.
Underwood, T S A,Sung, W,McFadden, C H,McMahon, S J,Hall, D C,McNamara, A L,Paganetti, H,Sawakuchi, G O,Schuemann, J IOP 2017 Physics in medicine & biology Vol.62 No.8
<P>Whilst Monte Carlo (MC) simulations of proton energy deposition have been well-validated at the macroscopic level, their microscopic validation remains lacking. Equally, no gold-standard yet exists for experimental metrology of individual proton tracks. In this work we compare the distributions of stochastic proton interactions simulated using the TOPAS-nBio MC platform against confocal microscope data for Al<SUB>2</SUB>O<SUB>3</SUB>:C,Mg fluorescent nuclear track detectors (FNTDs). We irradiated <img ALIGN='MIDDLE' ALT='$8\times 4\times 0.5$ ' SRC='http://ej.iop.org/images/0031-9155/62/8/3237/pmbaa6429ieqn001.gif'/> mm<SUP>3</SUP> FNTD chips inside a water phantom, positioned at seven positions along a pristine proton Bragg peak with a range in water of 12 cm. MC simulations were implemented in two stages: (1) using TOPAS to model the beam properties within a water phantom and (2) using TOPAS-nBio with Geant4-DNA physics to score particle interactions through a water surrogate of Al<SUB>2</SUB>O<SUB>3</SUB>:C,Mg. The measured median track integrated brightness (IB) was observed to be strongly correlated to both (i) voxelized track-averaged linear energy transfer (LET) and (ii) frequency mean microdosimetric lineal energy, <img ALIGN='MIDDLE' ALT='$\overline{{{y}_{F}}}$ ' SRC='http://ej.iop.org/images/0031-9155/62/8/3237/pmbaa6429ieqn002.gif'/>, both simulated in pure water. Histograms of FNTD track IB were compared against TOPAS-nBio histograms of the number of terminal electrons per proton, scored in water with mass-density scaled to mimic Al<SUB>2</SUB>O<SUB>3</SUB>:C,Mg. Trends between exposure depths observed in TOPAS-nBio simulations were experimentally replicated in the study of FNTD track IB. Our results represent an important first step towards the experimental validation of MC simulations on the sub-cellular scale and suggest that FNTDs can enable experimental study of the microdosimetric properties of individual proton tracks.</P>