Results 51 to 60 of about 40,102 (196)

An outburst from a massive star 40 days before a supernova explosion [PDF]

, 2013
Various lines of evidence suggest that very massive stars experience extreme mass-loss episodes shortly before they explode as a supernova. Interestingly, several models predict such pre-explosion outbursts. Establishing a causal connection between these
Arcavi, I., Bildsten, L., Bloom, J. S., Cenko, S. B., Filippenko, A. V., Gal-Yam, A., Horesh, A., Howell, D. A., Kasliwal, M. M., Kulkarni, S. R., Laher, R., Murray, D., Nakar, E., Nugent, P. E., Ofek, E. O., Shaviv, N. J., Silverman, J. M., Sullivan, M., Surace, J., Yaron, O.   +19 more
core   +2 more sources

Discovery of Precursor LBV Outbursts in Two Recent Optical Transients: The Fitfully Variable Missing Links UGC 2773-OT and SN 2009ip

, 2010
We present progenitor-star detections, light curves, and optical spectra of SN2009ip and the 2009 optical transient in UGC2773 (U2773-OT), which were not genuine SNe.
Adam Miller, Alexei V. Filippenko, Andrea M. Ghez, Andrew W. Howard, Berger, Berger, Berger, Bloom, Boles, Bond, Chu, Chugai, Drissen, Drissen, Filippenko, Frew, Geoffrey W. Marcy, Gogarten, Herschel, Hillier, Humphreys, Janet E. Colucci, Jeffrey M. Silverman, Jessica Lu, Joshua S. Bloom, Kashi, Li, Li, Li, Maza, Miller, Nathan Smith, Nugent, Osterbrock, Owocki, Peter Nugent, Petit, Prieto, Prieto, Prieto, Rebecca A. Bernstein, Skrutskie, Smith, Smith, Smith, Smith, Smith, Smith, Smith, Stahl, Stahl, Stahl, Stahl, Stahl, Sylvana Yelda, Szeifert, Thompson, Valeev, Van Dyk, Walborn, Weidong Li, Wesson, Wolf, Wolf, Wolf   +64 more
core   +1 more source

Solving the kilo-second QPO problem of the intermediate polar GK Persei [PDF]

, 1999
We detect the likely optical counterpart to previously reported X-ray QPOs in spectrophotometry of the intermediate polar GK Persei during the 1996 dwarf nova outburst. The characteristic timescales range between 4000--6000 s.
Morales-Rueda, L., Roche, P., Still, M. D.   +2 more
core   +3 more sources

Prediction model and experimental verification of coal and gas outburst shock wave based on Shock tube theory

Meitan xuebao
The coal and gas outburst process is frequently accompanied by strong dynamic effects, and the generating outburst shock wave will cause certain casualties, even damage ventilation facilities such as air doors, thus expanding the scope of accidents.
Xuelin YANG, Guangcai WEN, Haitao SUN, Fazhi YAN, Huiming YANG, Jie CAO, Xiaoyang CHENG, Jun LU, Huhu LI   +8 more
doaj   +1 more source

Photometric observations of the radio bright B[e]/X-ray binary CI Cam [PDF]

, 2000
We present multiwavelength (optical, IR, radio) observations of CI Cam, the optical counterpart to the transient X-ray source XTE J0421+560. Pre-outburst quiescent observations reveal the presence of a dusty envelope around the system.
Clark, J. S., Coe, M. J., Dieters, S., Efimov, Yu, Fabregat, J., Goranskii, V. P., Haswell, C. A., Hynes, R. I., Larionov, V. M., Lyuty, V. M., McCollough, M., Metlova, N. V., Miroshnichenko, A. S., Pooley, G. G., Robinson, E. L., Roche, P., Shenavrin, V. I., Welsh, W. F.   +17 more
core  

The outburst of dammed lake Maashey (North-Chuya ridge, Central Altai)

Лëд и снег
The dammed lakes are widespread in mountainous areas and usually occur when river flow is blocked by landslides, rock glaciers, etc. Among such lakes, the most dangerous are those located in the periglacial zone and blocked by rock glaciers.
V. A. Rasputina, G. V. Pryakhina, D. A. Ganyushkin, D. V. Bantcev, S. A. Griga, S. S. Svirepov   +5 more
doaj   +1 more source

Study on Plastic Zone Distribution Characteristic of Coal and Rock Mass in Excavation from Crosscut Coal

Geofluids, 2020
Coal and gas outburst is a serious disaster in the mining, and crosscut coal is the most prone to cause the coal and gas outburst. In order to study the mechanism of outburst, this paper studied the stress distribution characteristics in front of the ...
Chengwu Li, Xiaoqian Zhang, Chengmin Wei, Yao Nie   +3 more
doaj   +1 more source

Response characteristics of gas pressure under simultaneous static and dynamic load: Implication for coal and gas outburst mechanism

International Journal of Mining Science and Technology, 2023
Coal and gas outbursts are dynamic disasters in which a large mass of gas and coal suddenly emerges in a mining space within a split second. The interaction between the gas pressure and stress environment is one of the key factors that induce coal and ...
Longyong Shu, Liang Yuan, Qixian Li, Wentao Xue, Nannan Zhu, Zhengshuai Liu   +5 more
doaj   +1 more source

Remarkable changes in the near-infrared spectrum of the nova-like variable V4332 Sgr

, 2003
We report on recent near-IR observations of V4332 Sgr - the nova-like variable that erupted in 1994. Its rapid, post-outburst evolution to a cool M type giant/supergiant, soon after its outburst, had showed that it was an unusual object differing from ...
Barnbaum C., Dipankar P. K. Banerjee, Koornneef J., Nagarhalli M. Ashok, Olli Launila, Tsuji T., Watson P. Varricatt   +6 more
core   +1 more source

Research on particle size distribution characteristics of typical outburst coal

Meikuang Anquan
In order to deeply explore mechanism of the physical and mechanical properties of coal in the development of coal and gas outburst, in connection with the current state of insufficient research in characteristics of grain size distribution and grain ...
Yufu LI, Hongbo JI, Zhaoshi ZHANG
doaj   +1 more source