HOT THERMAL X-RAY EMISSION FROM THE Be STAR HD 119682

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 v...

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Bibliographic Details
Main Authors: Torrejón, J. M. (Author), Testa, P. (Author), Rodes, J. J. (Author), Nowak, Michael A. (Contributor), Schulz, Norbert S. (Contributor)
Other Authors: MIT Kavli Institute for Astrophysics and Space Research (Contributor)
Format: Article
Language:English
Published: IOP Publishing, 2015-01-29T18:56:38Z.
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Online Access:Get fulltext
LEADER 02141 am a22002533u 4500
001 93203
042 |a dc 
100 1 0 |a Torrejón, J. M.  |e author 
100 1 0 |a MIT Kavli Institute for Astrophysics and Space Research  |e contributor 
100 1 0 |a Nowak, Michael A.  |e contributor 
100 1 0 |a Schulz, Norbert S.  |e contributor 
700 1 0 |a Testa, P.  |e author 
700 1 0 |a Rodes, J. J.  |e author 
700 1 0 |a Nowak, Michael A.  |e author 
700 1 0 |a Schulz, Norbert S.  |e author 
245 0 0 |a HOT THERMAL X-RAY EMISSION FROM THE Be STAR HD 119682 
260 |b IOP Publishing,   |c 2015-01-29T18:56:38Z. 
856 |z Get fulltext  |u http://hdl.handle.net/1721.1/93203 
520 |a 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. 
520 |a Spain. Ministerio de Ciencia e Innovación (Grant AYA2010-15431) 
520 |a Spain. Ministerio de Ciencia e Innovación (Grant AIB2010DE-00057) 
546 |a en_US 
655 7 |a Article 
773 |t Astrophysical Journal