نتایج جستجو برای: lmc
تعداد نتایج: 2332 فیلتر نتایج به سال:
We report the discovery of two new R Coronae Borealis (RCB) stars in the Large Magellanic Cloud (LMC) using the MACHO project photometry database. The identification of both stars has been confirmed spectroscopically. One is a cool RCB star (T ef f ∼ 5000 K) characterized by very strong Swan bands of C 2 and violet bands of CN, and weak or absent Balmer lines, G-band and 12 C 13 C bands. The se...
We present results from three observations with the Rossi X-ray Timing Explorer (RXTE) of LMC X-3, obtained while the source was in an extended ’low/hard’ state. The data reveal a hard X-ray spectrum which is well fit by a pure power law with photon index Γ=1.69±0.02, with a source luminosity at 50 kpc of 5–16×1036 erg s−1 (2–10 keV). Strong broad-band (0.01-100 Hz) time variability is also obs...
We propose an observational test that can break the degeneracy of two main classes of microlensing models to the Magellanic Clouds: (a) the lenses are located in the Galactic halo, and (b) the lenses are located in the LMC disk. The source stars in the latter (self-lensing) models tend to be at the far side or behind the LMC disk, thus experience more reddening and extinction by dust in the LMC...
We first present the results of fully self-consistent numerical simulations of the Large and Small Magellanic Clouds (LMC and SMC), which show that the last collision between the Magellanic clouds about ∼ 0.2 Gyr ago can form the apparently off-center bar and peculiar HI spirals of the LMC. We also show that the present spatial distributions of young stars with ages less than ∼ 20 Myr in the LM...
A series of recent papers have claimed that intranode scattering, alone, can contribute to positive longitudinal magnetoconductance (LMC) due chiral anomaly (CA) in Weyl semimetals (WSMs). We revisit the problem CA induced LMC WSMs, and show by itself, does not result enhancement LMC. In limit zero internode charge must remain conserved, which is shown actually decrease Only presence a non-zero...
In this article, we propose an optimization algorithm for the original LMC [1] (Large Margin Classifier). We use PCA [2] (Principal Component Analysis) to reduce dimensionality of images, and then put data after reduction into optimized feature selection [3]. will get several features with greatest distinction. these classify images. Finally, experiment shows that accuracy under same dimensions...
We investigate the molecular bands in carbon-rich AGB stars in the Large Magellanic Cloud (LMC), using the InfraRed Spectrograph (IRS) on board the Spitzer Space Telescope (SST) over the 5–38 μm range. All 26 low-resolution spectra show acetylene (C2H2) bands at 7 and 14 μm. The hydrogen cyanide (HCN) bands at these wavelengths are very weak or absent. This is consistent with low nitrogen abund...
In haplodiploids, females pass their genes on to all their offspring, whereas a male's genes are only passed on to his daughters. Hence, males always benefit from female-biased sex ratios, whereas for females the optimal offspring sex ratio depends on the level of local mate competition (LMC), ranging from highly female-biased under strict LMC to unbiased in Panmixia. This generates a sexual co...
A sample of 27 Planetary Nebulae (PNs) in the Small Magellanic Clouds (SMC) have been observed with the Hubble Space Telescope Imaging Spectrograph (HST/STIS) to determine their morphology, size, and the spatial variation of the ratios of bright emission lines. The morphologies of SMC PNs are similar to those of LMC and Galactic PNs. However, only a third of the resolved SMC PNs are asymmetric,...
Previous studies have indicated that many of the RR Lyrae variables in the LMC have properties similar to the ones in the Galactic globular cluster M3. Assuming that the M3 RR Lyrae variables follow the same relationships among period, temperature, amplitude and Fourier phase parameter φ31 as their LMC counterparts, we have used the M3 φ31−log P relation to identify the M3-like unevolved first ...
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