نتایج جستجو برای: mira stars

تعداد نتایج: 57810  

Journal: :Monthly Notices of the Royal Astronomical Society 1999

Journal: :Astronomy and Astrophysics 2022

(abridged) Variability is a key property of stars on the asymptotic giant branch (AGB). Their pulsation period related to luminosity and mass-loss rate (MLR) star. Long-period variables (LPVs) Mira are most prominent all types variability evolved stars. However, reddest, obscured AGB too faint in optical have eluded large surveys. Our goal obtain sample LPVs with MLRs by analysing WISE W1 W2 li...

Journal: :Monthly Notices of the Royal Astronomical Society 2023

Abstract We report the 3D kinematics of 27 Mira-like stars in northern, eastern and southern periphery Large Magellanic Cloud (LMC), based on Gaia proper motions a dedicated spectroscopic follow-up. Low-resolution spectra were obtained for more than 40 candidates, selected to trace known substructures LMC periphery. Radial velocities stellar parameters derived all stars. data release 3 astromet...

1997
R. Alvarez

From near-infrared, narrow-band photometry of 256 oxygen-rich Mira variables we obtain evidence about the loops that these stars follow in colour–colour diagrams.We also find a phase lag between indices related to molecular band-strength of titanium oxide and vanadium oxide. We compute colours for normal M–giants and Miras using hydrostatic and hydrodynamic model atmospheres and very extensive ...

2008
John W. Menzies Michael W. Feast Patricia A. Whitelock

Optical radial velocities have been measured for 38 C-type Mira variables. These data together with others in the literature are used to study the differences between optical and CO mm observations for C-Miras and the necessary corrections to the optical velocities are derived in order to obtain the true radial velocities of the variables. The difference between absorption and emission line vel...

2014
A. Ercument Cicek Kathryn Roeder Gultekin Özsoyoglu

MOTIVATION Discovering the transcriptional regulatory architecture of the metabolism has been an important topic to understand the implications of transcriptional fluctuations on metabolism. The reporter algorithm (RA) was proposed to determine the hot spots in metabolic networks, around which transcriptional regulation is focused owing to a disease or a genetic perturbation. Using a z-score-ba...

2013
Keigo Kubo Sakriani Sakti Graham Neubig Tomoki Toda Satoshi Nakamura

The current state-of-the-art approach in grapheme-to-phoneme (g2p) conversion is structured learning based on the Margin Infused Relaxed Algorithm (MIRA), which is an online discriminative training method for multiclass classification. However, it is known that the aggressive weight update method of MIRA is prone to overfitting, even if the current example is an outlier or noisy. Adaptive Regul...

2004
David R. Alves

The average of 14 recent measurements of the distance to the Large Magellanic Cloud (LMC) implies a true modulus of 18.50 ± 0.02 mag, and demonstrates a trend in the past 2 years of convergence toward a standard value. The distance indicators reviewed are the red clump, the tip of the red giant branch, Cepheid, RR Lyrae, and Mira variable stars, cluster main-sequence fitting, supernova 1987A, a...

2010
Edward H. Wishnow William Mallard Vikram Ravi Sean Lockwood Walt Fitelson Dan Werthimer Charles H. Townes

The Infrared Spatial Interferometer (ISI) is a three telescope interferometer system that operates near 11 microns wavelength using heterodyne detection with CO2 lasers as local oscillators. Stellar measurements have been made using consistent instrumentation for 20 years, allowing comparisons of stellar sizes of red giant and Mira stars over time intervals which are long in comparison to stell...

2015
Liangyou Li Hui Yu Qun Liu

In this paper, we describe our submission to WMT 2015 Tuning Task. We integrate a dependency-based MT evaluation metric, RED, to Moses and compare it with BLEU and METEOR in conjunction with two tuning methods: MERT and MIRA. Experiments are conducted using hierarchical phrase-based models on Czech–English and English–Czech tasks. Our results show that MIRA performs better than MERT in most cas...

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