HOT THERMAL X-RAY EMISSION FROM THE Be STAR HD 119682
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Torrejon-2013-HOT THERMAL X-RAY EM.pdf
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Author(s)
Torrejón, J. M.
Testa, P.
Rodes, J. J.
Nowak, Michael A.
Schulz, Norbert S.
Date Issued
February 2013
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Torrejón, J. M., N. S. Schulz, M. A. Nowak, P. Testa, and J. J. Rodes. “HOT THERMAL X-RAY EMISSION FROM THE Be STAR HD 119682.” The Astrophysical Journal 765, no. 1 (February 11, 2013): 13. © 2013 The American Astronomical Society
Version
Final published version
Abstract
We present an analysis of a series of four consecutive Chandra high-resolution transmission gratings observations, amounting to a total of 150 ks, of the Be X-ray source HD 119682 (=1WGA J1346.5–6255), a member of the new class of γ Cas analogs. The Chandra light curve shows significant brightness variations on timescales of hours. However, the spectral distribution appears rather stable within each observation and during the whole campaign. A detailed analysis is not able to detect any coherent pulsation up to a frequency of 0.05 Hz. The Chandra High Energy Transmission Gratings spectrum seems to be devoid of any strong emission line, including Fe Kα fluorescence. The continuum is well described with the addition of two collisionally ionized plasmas of temperatures kT ≈ 15 keV and 0.2 keV, respectively, by the apec model. Models using photoionized plasma components (mekal) or non-thermal components (powerlaw) give poorer fits, providing support for the pure thermal scenario. These two components are absorbed by a single column with N H = (0.20[superscript +0.15] –0.03) × 10[superscript 22] cm[superscript –2] compatible with the interstellar value. We conclude that HD 119682 can be regarded as a pole-on γ Cas analog.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-637x/765/1/13
