X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS
We study the spectral and temporal behavior of X-ray flares from the active M dwarf EV Lac in 200 ks of exposure with the Chandra/HETGS. We derive flare parameters by fitting an empirical function which characterizes the amplitude, shape, and scale. The flares range from very short (<1 ks) to lon...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en_US |
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Institute of Physics/American Astronomical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/95892 |
| _version_ | 1811097107398918144 |
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| author | Huenemoerder, David P. Schulz, Norbert S. Testa, Paola Drake, Jeremy J. Osten, Rachel A. Reale, Fabio |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Huenemoerder, David P. Schulz, Norbert S. Testa, Paola Drake, Jeremy J. Osten, Rachel A. Reale, Fabio |
| author_sort | Huenemoerder, David P. |
| collection | MIT |
| description | We study the spectral and temporal behavior of X-ray flares from the active M dwarf EV Lac in 200 ks of exposure with the Chandra/HETGS. We derive flare parameters by fitting an empirical function which characterizes the amplitude, shape, and scale. The flares range from very short (<1 ks) to long (~10[superscript 4] s) duration events with a range of shapes and amplitudes for all durations. We extract spectra for composite flares to study their mean evolution and to compare flares of different lengths. Evolution of spectral features in the density-temperature plane shows probable sustained heating. The short flares are significantly hotter than the longer flares. We determined an upper limit to the Fe K fluorescent flux, the best-fit value being close to what is expected for compact loops. |
| first_indexed | 2024-09-23T16:54:27Z |
| format | Article |
| id | mit-1721.1/95892 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:54:27Z |
| publishDate | 2015 |
| publisher | Institute of Physics/American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/958922022-09-29T22:19:53Z X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS Huenemoerder, David P. Schulz, Norbert S. Testa, Paola Drake, Jeremy J. Osten, Rachel A. Reale, Fabio MIT Kavli Institute for Astrophysics and Space Research Huenemoerder, David P. Schulz, Norbert S. We study the spectral and temporal behavior of X-ray flares from the active M dwarf EV Lac in 200 ks of exposure with the Chandra/HETGS. We derive flare parameters by fitting an empirical function which characterizes the amplitude, shape, and scale. The flares range from very short (<1 ks) to long (~10[superscript 4] s) duration events with a range of shapes and amplitudes for all durations. We extract spectra for composite flares to study their mean evolution and to compare flares of different lengths. Evolution of spectral features in the density-temperature plane shows probable sustained heating. The short flares are significantly hotter than the longer flares. We determined an upper limit to the Fe K fluorescent flux, the best-fit value being close to what is expected for compact loops. Chandra X-ray Center (U.S.) (NASA contract NAS8-03060) United States. National Aeronautics and Space Administration (contract NAS8-03060) United States. National Aeronautics and Space Administration (Smithsonian Astrophysical Observatory contract SV3–73016) 2015-03-05T19:57:06Z 2015-03-05T19:57:06Z 2010-11 2010-06 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/95892 Huenemoerder, David P., Norbert S. Schulz, Paola Testa, Jeremy J. Drake, Rachel A. Osten, and Fabio Reale. “X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS.” The Astrophysical Journal 723, no. 2 (October 25, 2010): 1558–1567. © 2010 American Astronomical Society. en_US http://dx.doi.org/10.1088/0004-637x/723/2/1558 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Physics/American Astronomical Society American Astronomical Society |
| spellingShingle | Huenemoerder, David P. Schulz, Norbert S. Testa, Paola Drake, Jeremy J. Osten, Rachel A. Reale, Fabio X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS |
| title | X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS |
| title_full | X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS |
| title_fullStr | X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS |
| title_full_unstemmed | X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS |
| title_short | X-RAY FLARES OF EV Lac: STATISTICS, SPECTRA, AND DIAGNOSTICS |
| title_sort | x ray flares of ev lac statistics spectra and diagnostics |
| url | http://hdl.handle.net/1721.1/95892 |
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