Results 11 to 20 of about 34,380 (305)

Classifying Optical (Out)bursts in Cataclysmic Variables: The Distinct Observational Characteristics of Dwarf Novae, Micronovae, Stellar Flares, and Magnetic Gating [PDF]

The Astrophysical Journal Letters
Cataclysmic variables can experience short optical brightenings, which are commonly attributed to phenomena such as dwarf novae outbursts, micronovae, donor flares, or magnetic gating bursts.
Krystian Iłkiewicz, Simone Scaringi, Martina Veresvarska, Domitilla De Martino, Colin Littlefield, Christian Knigge, John A. Paice, Anwesha Sahu   +7 more
doaj   +2 more sources

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

Minutes-duration optical flares with supernova luminosities

Nature, 2023
In recent years, certain luminous extragalactic optical transients have been observed to last only a few days. Their short observed duration implies a different powering mechanism from the most common luminous extragalactic transients (supernovae) whose timescale is weeks.
Ho, A.Y.Q., Perley, D.A., Chen, P., Schulze, S., Dhillon, V., Kumar, H., Suresh, A., Swain, V., Bremer, M., Smartt, S.J., Anderson, J.P., Anupama, G.C., Awiphan, S., Barway, S., Bellm, E.C., Ben-Ami, S., Bhalerao, V., de Boer, T., Brink, T.G., Burruss, R., Chandra, P., Chen, T.-W., Chen, W.-P., Cooke, J., Coughlin, M.W., Das, K.K., Drake, A.J., Filippenko, A.V., Freeburn, J., Fremling, C., Fulton, M.D., Gal-Yam, A., Galbany, L., Gao, H., Graham, M.J., Gromadzki, M., Gutiérrez, C.P., Hinds, K.-R., Inserra, C., A J, N., Karambelkar, V., Kasliwal, M.M., Kulkarni, S., Müller-Bravo, T.E., Magnier, E.A., Mahabal, A.A., Moore, T., Ngeow, C.-C., Nicholl, M., Ofek, E.O., Omand, C.M.B., Onori, F., Pan, Y.-C., Pessi, P.J., Petitpas, G., Polishook, D., Poshyachinda, S., Pursiainen, M., Riddle, R., Rodriguez, A.C., Rusholme, B., Segre, E., Sharma, Y., Smith, K.W., Sollerman, J., Srivastav, S., Strotjohann, N.L., Suhr, M., Svinkin, D., Wang, Y., Wiseman, P., Wold, A., Yang, S., Yang, Y., Yao, Y., Young, D.R., Zheng, W.   +76 more
openaire   +8 more sources

Chandra, HST/STIS, NICER, Swift, and TESS Detail the Flare Evolution of the Repeating Nuclear Transient ASASSN -14ko

The Astrophysical Journal, 2023
ASASSN-14ko is a nuclear transient at the center of the AGN ESO 253−G003 that undergoes periodic flares. Optical flares were first observed in 2014 by the All-Sky Automated Survey for Supernovae (ASAS-SN) and their peak times are well-modeled with a ...
Anna V. Payne, Katie Auchettl, Benjamin J. Shappee, Christopher S. Kochanek, Patricia T. Boyd, Thomas W.-S. Holoien, Michael M. Fausnaugh, Chris Ashall, Jason T. Hinkle, Patrick J. Vallely, K. Z. Stanek, Todd A. Thompson   +11 more
doaj   +1 more source

Dynamics of small-scale magnetic fields before small and large solar flares

Solar-Terrestrial Physics, 2023
We have examined the dynamics of the longitudinal magnetic field of active region NOAA 12673, using data from the Solar Dynamics Observatory (SDO). During the passage of the active region (AR) across the solar disk, its spots and background fields showed
Borovik A. V., Zhdanov A. A.
doaj   +1 more source

The Optical Flare [PDF]

Solar Physics, 1983
Optical observationd now present considerable information on the flare process. It is always associated with filaments and with simplification of existing magnetic connections, and it arises from the emergence and expansion of new flux.
openaire   +3 more sources

UV/Optical Detections of Candidate Tidal Disruption Events by GALEX and CFHTLS [PDF]

, 2008
We present two luminous UV/optical flares from the nuclei of apparently inactive early-type galaxies at z=0.37 and 0.33 that have the radiative properties of a flare from the tidal disruption of a star.
B. Milliard, Bade N., Cattaneo A., D. C. Martin, D. Schiminovich, Frank J., G. Bazin, Greiner J., J. P. Halpern, K. Forster, Komossa S., Komossa S., Lidskii V. V., M. Seibert, P. G. Friedman, P. Morrissey, S. Basa, S. G. Neff, S. Gezari, Syer D., T. K. Wyder, T. Small, Ulmer A., Voges W.   +23 more
core   +2 more sources

Optical Flares: Observations and Interpretations [PDF]

International Astronomical Union Colloquium, 1995
AbstractObservational results on flare stars in the Galaxy and their interpretation, based on the observational approach to early stages of stellar evolution at Byurakan, are considered. The evolutionary path of red flare stars is determined. Stellar flare activity is explained as an internal phenomenon of stars.
openaire   +1 more source

Statistical studies of low-power solar flares. Distribution of flares by area, brightness, and classes

Solar-Terrestrial Physics, 2017
An electronic database has been created for 123801 solar flares that occurred on the Sun over the period from 1972 to 2010. It is based on catalogs of the Solar Geophysical Data (SGD) and Quarterly Bulletin on Solar Activity.
Borovik A.V., Zhdanov A.A.
doaj   +1 more source

Statistical Signatures of Nanoflare Activity. III. Evidence of Enhanced Nanoflaring Rates in Fully Convective stars as Observed by the NGTS

The Astrophysical Journal, 2023
Previous examinations of fully convective M-dwarf stars have highlighted enhanced rates of nanoflare activity on these distant stellar sources. However, the specific role the convective boundary, which is believed to be present for spectral types earlier
S. D. T. Grant, D. B. Jess, C. J. Dillon, M. Mathioudakis, C. A. Watson, J. A. G. Jackman, D. G. Jackson, P. J. Wheatley, M. R. Goad, S. L. Casewell, D. R. Anderson, M. R. Burleigh, R. G. West, J. I. Vines   +13 more
doaj   +1 more source