کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1779645 | 1022014 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A serendipitous XMM-Newton observation of MACHO 104.20906.960: A dwarf nova candidate with a 2Â h period
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The binaries known as cataclysmic variables are particular binary systems in which the primary star (a white dwarf) accretes material from a secondary via Roche-lobe mechanism. Usually, these objects have orbital period of a few hours so that a detailed temporal analysis can be performed. Here, we present Chandra and XMM-Newton observations of a dwarf nova candidate identified in the past by optical observations towards the galactic Bulge and labeled as MACHO 104.20906.960. After a spectral analysis, we used the Lomb-Scargle technique for the period search and evaluated the confidence level using Monte-Carlo simulations. In this case, we found that the X-ray source shows a period of 2.03-0.07+0.09 h (3Ï error) so that it is most likely a system of interacting objects. The modulation of the signal was found with a confidence level of >99%. The spectrum can be described by a two thermal plasma components with X-ray flux in the 0.3-10Â keV energy band of 1.77-0.19+0.16Ã10-13ergs-1cm-2. We find that the distance of the source is approximately 1Â kpc thus corresponding to a luminosity LXâ2Ã1031erg s-1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: New Astronomy - Volume 14, Issue 3, April 2009, Pages 302-306
Journal: New Astronomy - Volume 14, Issue 3, April 2009, Pages 302-306
نویسندگان
A.A. Nucita, S. Carpano, F. De Paolis, G. Ingrosso, B.M.T. Maiolo, M. Guainazzi,