Pulsations of optical radiation during the flare of YZ CMi occurred on February 9, 2008
One of the most powerful and long-lived flares on the active red dwarf YZ CMi is considered. The flare was observed in the U band at the Terskol Peak Observatory on February 9, 2008. During the formation of the flare over the course of 30 seconds, the flare-induced stellar luminosity increased and b...
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| Veröffentlicht in: | Kinematics and physics of celestial bodies 2011-06, Vol.27 (3), p.154-159 |
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| container_title | Kinematics and physics of celestial bodies |
| container_volume | 27 |
| creator | Zhilyaev, B. E. Tsap, Yu. T. Andreev, M. V. Stepanov, A. V. Kopylova, Yu. G. Gershberg, R. E. Lovkaya, M. N. Sergeev, A. V. Verlyuk, I. A. Stetsenko, K. O. |
| description | One of the most powerful and long-lived flares on the active red dwarf YZ CMi is considered. The flare was observed in the U band at the Terskol Peak Observatory on February 9, 2008. During the formation of the flare over the course of 30 seconds, the flare-induced stellar luminosity increased and became more than 180 times the preflare value. The total duration of the flare was approximately one hour. At the flare maximum, quasi-periodic pulsations having a specified period of approximately 11 s, an initial modulation depth of 5.5%, and an exponential damping time of 29 s were discovered using wavelet analysis. Assuming that the pulsations were caused by fast magnetohydrodynamic oscillations of a flare loop, the following parameters were determined in the region of energy release using coronal seismology methods: plasma concentration (2 × 10
10
cm
−3
), temperature (3 × 10
7
K), and magnetic field strength (0.015 T). |
| doi_str_mv | 10.3103/S088459131103007X |
| format | Article |
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10
cm
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7
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10
cm
−3
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7
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E.</au><au>Tsap, Yu. T.</au><au>Andreev, M. V.</au><au>Stepanov, A. V.</au><au>Kopylova, Yu. G.</au><au>Gershberg, R. E.</au><au>Lovkaya, M. N.</au><au>Sergeev, A. V.</au><au>Verlyuk, I. A.</au><au>Stetsenko, K. O.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Pulsations of optical radiation during the flare of YZ CMi occurred on February 9, 2008</atitle><jtitle>Kinematics and physics of celestial bodies</jtitle><stitle>Kinemat. Phys. Celest. Bodies</stitle><date>2011-06-01</date><risdate>2011</risdate><volume>27</volume><issue>3</issue><spage>154</spage><epage>159</epage><pages>154-159</pages><issn>0884-5913</issn><eissn>1934-8401</eissn><abstract>One of the most powerful and long-lived flares on the active red dwarf YZ CMi is considered. The flare was observed in the U band at the Terskol Peak Observatory on February 9, 2008. During the formation of the flare over the course of 30 seconds, the flare-induced stellar luminosity increased and became more than 180 times the preflare value. The total duration of the flare was approximately one hour. At the flare maximum, quasi-periodic pulsations having a specified period of approximately 11 s, an initial modulation depth of 5.5%, and an exponential damping time of 29 s were discovered using wavelet analysis. Assuming that the pulsations were caused by fast magnetohydrodynamic oscillations of a flare loop, the following parameters were determined in the region of energy release using coronal seismology methods: plasma concentration (2 × 10
10
cm
−3
), temperature (3 × 10
7
K), and magnetic field strength (0.015 T).</abstract><cop>Heidelberg</cop><pub>Allerton Press, Inc</pub><doi>10.3103/S088459131103007X</doi><tpages>6</tpages></addata></record> |
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| subjects | Astronomy Astrophysics Corona Dwarfism Fluid mechanics Magnetic fields Observations and Techniques Physics Physics and Astronomy Physics of Stars and Interstellar Medium Seismology Stars & galaxies |
| title | Pulsations of optical radiation during the flare of YZ CMi occurred on February 9, 2008 |
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