Academic Journal
Preprint typeset using L ATEX style emulateapj v. 4/12/04 HIGH-RESOLUTION X-RAY SPECTROSCOPY OF THE ULTRACOMPACT LMXB PULSAR 4U 1626–67
| العنوان: | Preprint typeset using L ATEX style emulateapj v. 4/12/04 HIGH-RESOLUTION X-RAY SPECTROSCOPY OF THE ULTRACOMPACT LMXB PULSAR 4U 1626–67 |
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| المؤلفون: | Miriam I. Krauss, Norbert S. Schulz, Deepto Chakrabarty, Adrienne M. Juett, Jean Cottam |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://arxiv.org/pdf/astro-ph/0611823v1.pdf. |
| سنة النشر: | 2008 |
| المجموعة: | CiteSeerX |
| الوصف: | We report results from four recent observations of the ultracompact low-mass X-ray binary pulsar 4U 1626−67. All the observations obtained high-resolution X-ray spectra of the system, two from the Chandra X-ray Observatory using the High Energy Transmission Grating Spectrometer, and two from the XMM-Newton Observatory using the Reflection Grating Spectrometer as well as the EPIC PN and MOS. These data allow us to study in detail the prominent Ne and O emission line complexes which make 4U 1626−67 unique among LMXBs. The observations were spaced over a period of 3 years for a total observing time of 238 ks, allowing us to monitor the line regions as well as the overall source flux, continuum spectrum, and timing properties. The structure of the emission lines and the ratios of the components of the helium-like Ne IX and O VII triplets support the hypothesis that they are formed in the high-density environment of the accretion disk. We do not find any significant changes in the line widths or ratios over this time period, though we note that the line equivalent widths decrease. Using the most recent calibration products, we are able to place constraints on the strengths of the Ne K, Fe L, and O K photoelectric absorption edges. In contrast to our earlier analysis, the data do not require an overabundance of Ne or O in the system relative to the expected ISM values. We find |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.317.7738; http://arxiv.org/pdf/astro-ph/0611823v1.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.317.7738 http://arxiv.org/pdf/astro-ph/0611823v1.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.27D721C4 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |