Results 41 to 50 of about 22,322 (295)

Detecting Stellar Flares in Photometric Data Using Hidden Markov Models

The Astrophysical Journal
We present a hidden Markov model (HMM) for discovering stellar flares in light-curve data of stars. HMMs provide a framework to model time series data that are nonstationary; they allow for systems to be in different states at different times and ...
J. Arturo Esquivel, Yunyi Shen, Vianey Leos-Barajas, Gwendolyn Eadie, Joshua S. Speagle, Radu V Craiu, Amber Medina, James R. A. Davenport   +7 more
doaj   +1 more source

Properties of serendipitous X-ray flares discovered in XMM-Newton observations

, 2004
We present the results of a search of the XMM-Newton public data archive for stellar X-ray flares. We find eight flaring sources for which we identify 7 optical counterparts.
Allen, Barnes, Braes, Brown, Carl Foley, Chen, de Epstein, Dorman, Duncan Trenholme, Fuhrmeister, Gavin Ramsay, Glover, Golub, Jansen, Martres, Mewe, Micela, Moreton, Pallavicini, Panagi, Pearce, Perlman, Perryman, Pillitteri, Pillitteri, Priest, Prosser, Ramsay, Randich, Robichon, Serio, Shibata, Stern, Strüder, Tsikoudi, Wiramihardja, Švestka   +36 more
core   +1 more source

Diagnostics of stellar flares from X-ray observations: from the decay to the rise phase [PDF]

, 2007
The diagnostics of stellar flaring coronal loops have been so far largely based on the analysis of the decay phase. We derive new diagnostics from the analysis of the rise and peak phase of stellar flares. We release the assumption of full equilibrium of
Aschwanden, Betta, Betta, Cargill, Cheng, F. Reale, Favata, Favata, Favata, Favata, Fisher, Giardino, Güdel, Haisch, Hawley, Jakimiec, Kopp, MacNeice, Maggio, Nagai, Nagai, Peres, Reale, Reale, Reale, Rosner, Schmitt, Serio, Stelzer, Sylwester, van den Oord, van den Oord, Warren, Warren   +33 more
core   +2 more sources

Multi-wavelength observations of stellar flares [PDF]

Solar Physics, 1989
AbstractWe present observational data on stellar flares from a range of wavelength regimes, many of which were obtained simultaneously. Physical parameters of these flares are derived and discussed in the framework of the general solar flare model. It is found that flares on dMe stars are solar-like, except in mean energy.
openaire   +1 more source

A Qualitative Analysis of Patient Perspectives and Preferences in Lupus Management to Guide Lupus Guidelines Development

Arthritis Care &Research, EarlyView.
Objective A patient‐centered approach for chronic disease management, including systemic lupus erythematosus (SLE), aligns treatment with patients’ values and preferences, leading to improved outcomes. This paper summarizes how patient experiences, perspectives, and priorities informed the American College of Rheumatology (ACR) 2024 Lupus Nephritis (LN)
Shivani Garg, Izzy Hartel, Lisa R. Sammaritano, Anca Askanase, Bonnie L. Bermas, Maria Dall'Era, Alí Duarte‐García, Victoria P. Werth, Brad Rovin, Reem A. Mustafa, Amy S. Turner, Bené Williams, Brian L. Ung, Hiya Bhavsar, Monique C. Gore‐Massy, Nahirannette Pulido, Natacha Guerrero, Natalie M. Smith, Wambui Machua, Linda T. Hiraki, Mary Beth Son   +20 more
wiley   +1 more source

Starspot Mapping with Adaptive Parallel Tempering. II. Application to TESS Data for M-dwarf Flare Stars AU Microscopii, YZ Canis Minoris, and EV Lacertae

The Astrophysical Journal, 2023
Starspots and stellar flares are indicators of stellar magnetic activity. The magnetic energy stored around spots is thought to be the origin of flares, but the connection is not completely understood.
Kai Ikuta, Kosuke Namekata, Yuta Notsu, Hiroyuki Maehara, Soshi Okamoto, Satoshi Honda, Daisaku Nogami, Kazunari Shibata   +7 more
doaj   +1 more source

A Survey of High Contrast Stellar Flares Observed by Chandra

, 2011
The X-ray light curves of pre-main sequence stars can show variability in the form of flares altering a baseline characteristic activity level; the largest X-ray flares are characterized by a rapid rise to more than 10 times the characteristic count rate,
Aarnio, Audard, Baba, Baraffe, Calvet, D'Alessio, Dahm, Damiani, Delgado, Drake, Edwards, Favata, Feigelson, Flaccomio, Garmire, Getman, Getman, Glassgold, Gutermuth, Gutermuth, Gutermuth, Güdel, Imanishi, J. E. McCleary, Jakimiec, Kohno, MacNeice, Muzerolle, Osten, Povich, Preibisch, Reale, Rebull, S. J. Wolk, Scargle, Schaefer, Serio, Shu, Shu, Siess, Skinner, Skinner, Skinner, Skrutskie, Smith, Tsuboi, Tsujimoto, Uzdensky, Winston, Winston, Wolk   +50 more
core   +1 more source

Response to Allopurinol and Febuxostat According to the Fractional Excretion of Urate in Men With Gout

Arthritis Care &Research, EarlyView.
Objective Body mass index (BMI), glomerular filtration rate (GFR), and pretreatment urate levels have been reported to influence the urate‐lowering response to allopurinol. We investigated whether the fractional excretion of uric acid (FEUA) also modulates this response and relates to oxypurinol concentrations.
Pascal Richette, Anouk Walter‐Petrich, Quang Dinh Nguyen, Matthieu Resche‐Rigon, Quang Huy Dinh Nguyen, Minh Duc Do, Thao Phuong Mai, Tuan Duc Nguyen, Fernando Perez‐Ruiz, Emmanuel Letavernier, Tristan Pascart, Augustin Latourte, Hang Korng Ea, Thomas Bardin   +13 more
wiley   +1 more source

A Machine Learning Approach for Identifying Coronal Mass Ejection–associated Stellar Flares in TESS Observations

The Astrophysical Journal Supplement Series
Coronal mass ejections (CMEs) are major drivers of stellar space weather and can strongly influence the habitability of exoplanets. However, compared to the frequent occurrence of white-light flares, confirmed stellar CMEs remain extremely rare.
Yu Shi, Hong-Peng Lu, Li-Yun Zhang, Tian-Hao Su, Chao Tan   +4 more
doaj   +1 more source

Constraints on Stellar Flare Energy Ratios in the NUV and Optical from a Multiwavelength Study of GALEX and Kepler Flare Stars

The Astrophysical Journal, 2023
We present a multiwavelength study of stellar flares on primarily G-type stars using overlapping time domain surveys in the near-ultraviolet (NUV) and optical regimes. The NUV (the Galaxy Evolution Explorer; GALEX) and optical (Kepler) wavelength domains
C. E. Brasseur, Rachel A. Osten, Isaiah I. Tristan, Adam F. Kowalski   +3 more
doaj   +1 more source