Results 61 to 70 of about 241,534 (269)

The exponential pedagogical model applied to Astronomy: A practical case of kinematic stellar velocity calculation

Revista de Investigación de Física
The paradigm of a learning model has been explained and validated in an applied case of an astronomy problem where the data we used are declination, parallax, radial velocity of a star, as well as its annual variation in right ascension and declination. 
Rafael Carlos, Atilio Buendía, Felipe Reyes   +2 more
doaj   +1 more source

Class Transitions and Two Component Accretion Flow in GRS 1915+105

, 2005
The light curve of the galactic micro-quasar GRS 1915+105 changes in at least thirteen different ways which are called classes. We present examples of the transitions from one class to another as observed by the IXAE instrument aboard the Indian ...
A. K. Chatterjee, A. K. Choudhury, A. Nandi, Chakrabarti, Chakrabarti, Chakrabarti, Greiner, Greiner, Molteni, Naik, Naik, Naik, Nandi, Nandi, Paul, Remillard, S. K. Chakrabarti, Smith, Smith, U. Chatterjee   +19 more
core   +2 more sources

The Effect of Magnetic Variability on Stellar Angular Momentum Loss II: The Sun, 61 Cygni A, $\epsilon$ Eridani, $\xi$ Bootis A and $\tau$ Bootis A [PDF]

, 2019
The magnetic fields of low-mass stars are observed to be variable on decadal timescales, ranging in behaviour from cyclic to stochastic. The changing strength and geometry of the magnetic field should modify the efficiency of angular momentum loss by ...
Finley, Adam J., Matt, Sean P., See, Victor   +2 more
core   +2 more sources

Evidence for Itinerant Ferromagnetic Flat Bands Producing Large Transverse Responses

Advanced Materials, EarlyView.
Itinerant ferromagnetic flat bands are demonstrated in GdCo5 with a high Curie temperature of 940K, a stacked honeycomb–kagome lattice, through angle‐resolved photoemission spectroscopy and magneto‐thermoelectric measurements. These topological flat bands generate large Berry curvaturte, producing gigantic anomalous Nernst effect with record‐high ...
Susumu Minami, Yangming Wang, Seigo Souma, Hiroto Nakamura, Akito Sakai, Takumi Osumi, Hang Su, Hikaru Watanabe, Shun'ichiro Kurosawa, Rikuto Oiwa, Daisuke Nishio‐Hamane, Kosuke Nakayama, Takuya Nomoto, Ryotaro Arita, Takafumi Sato, Satoru Nakatsuji   +15 more
wiley   +1 more source

The Transit Timing and Transmission Spectrum of Hot Jupiter WASP-43 b from a Decade of Multiband Transit follow-up Observations

The Astronomical Journal
We present a new set of 35 transit light curves of the hot Jupiter WASP-43 b, obtained through the SPEARNET network. These datasets were analyzed together with previously published ground-based observations, as well as space-based data from TESS, Hubble ...
Napaporn A-thano, Supachai Awiphan, Eamonn Kerins, Akshay Priyadarshi, Iain McDonald, Ing-Guey Jiang, Yogesh C. Joshi, Fan Yang, Ida Janiak, Patcharawee Munsaket, Yasir Abdul Qadir, Ronnakrit Rattanamala, Orarik Tasuya, Ekburus Boonsoy, Nuanwan Sanguansak, Rattiyakorn Rattanasai, Thammasorn Padjaroen, Siramas Komonjinda, Sawatkamol Pichadee, Ananpol Sudsap, Smanchan Chandaiam, Boonyarit Choonhakit, Suwanit Wutsang, Vik S Dhillon   +23 more
doaj   +1 more source

Room‐Temperature Skyrmionic Synapse in 2D Ferromagnet Fe3GaTe2 Operating via Collective Spin Texture Transformation

Advanced Materials, EarlyView.
We demonstrate a neuromorphic synapse in 2D Fe3GaTe2 flakes. The device operates via a current‐driven transformation from a skyrmion‐lattice to a stripe‐domain state, yielding a linear anomalous Hall resistance response with a tunable slope to enable multiply‐accumulate operations. Simulations confirm its viability in artificial neural networks.
Jixiang Huang, Tongji Zhu, PeiYu Cai, Xiaoming Ma, Zhen Wang, Ruifu Zhang, Yi Hao, Jingdi Lu, Liubing He, Jun Xu, Yuejie Zhang, Wanjun Jiang, Jing Tao, Shiming Lei, Pavel Parchinskiy, Jing Teng, Lingfei Wang, Wei Niu, Elton J.G. Santos, Xiaoqian Zhang, Peng Li   +20 more
wiley   +1 more source

Inferring Exoplanet Parameters from Transit Timing Variations Using LSTM Networks

The Planetary Science Journal
Transit timing variation (TTV) analysis provides a valuable complement to traditional transit and radial-velocity techniques, particularly in compact, near-resonant planetary systems where dynamical interactions amplify timing signals and refine mass and
Muhammad Isnaenda Ikhsan, Mochamad Ikbal Arifyanto, Taufiq Hidayat   +2 more
doaj   +1 more source

Photometric Study of Contact Binary AW UMa [PDF]

Journal of Astronomy and Space Sciences, 1995
BVRI observations of AW UMa were made from March to April during 13 nights in 1994 using the 35cm schmidt-Cassegrain telescope of Department of Astronomy and Space Science, Chungbuk National University.
Jo Ryeong Yim, Jang Hae Jeong
doaj  

Numerical self-consistent stellar models of thin disks

, 2005
We find a numerical self-consistent stellar model by finding the distribution function of a thin disk that satisfies simultaneously the Fokker-Planck and Poisson equations.
Aarseth, Ashurov, Cohn, de Zeeuw, de Zeeuw, Eddington, Freeman, Hunter, Jeans, Joshi, Kalnajs, King, Kuzmin, Letelier, M. Ujevic, Mestel, Michie, Michie, Miller, Miller, Miyamoto, Ng, Nishida, P. S. Letelier, Plummer, Rosenbluth, Schwarzschild, Statler, Stone, Takahashi, Takahashi, Teuben, Theuns, Toomre, Ujevic, van Albada, van de Ven, Vandervoort, Vogt, Watanabe, Wilkinson, Yepes   +41 more
core   +1 more source

SWAS and Arecibo observations of H2O and OH in a diffuse cloud along the line-of-sight to W51 [PDF]

, 2002
Observations of W51 with the Submillimeter Wave Astronomy Satellite (SWAS) have yielded the first detection of water vapor in a diffuse molecular cloud.
David A. Neufeld, David J. Hollenbach, Elitzur M., Joulain K., Michael J. Kaufman, Paul F. Goldsmith, Rene Plume, Williams T. L.   +7 more
core   +4 more sources