Academic Journal
Astronomy & Astrophysics manuscript no. (will be inserted by hand later) Rapid variability of accretion in AM Herculis
| العنوان: | Astronomy & Astrophysics manuscript no. (will be inserted by hand later) Rapid variability of accretion in AM Herculis |
|---|---|
| المؤلفون: | D. De Martino, G. Matt, B. T. Gänsicke, R. Silvotti, J. M. Bonnet-bidaud, M. Mouchet |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://arxiv.org/pdf/astro-ph/0209538v1.pdf. |
| سنة النشر: | 2002 |
| المجموعة: | CiteSeerX |
| الوصف: | We present the last pointed observation of AMHer carried out during the life of the BeppoSAX satellite. It was bright at the beginning of the observation, but dropped to the lowest X-ray level ever observed so far. The X-ray emission during the bright period is consistent with accretion occurring onto the main pole of the magnetized white dwarf. The rapid change from the active state to the low deep state indicates a drop by a factor of 17 in the accretion rate and hence that accretion switched-off. The short timescale (less than one hour) of this variation still remains a puzzle. Optical photometry acquired simultaneousy during the low state shows that the white dwarf remains heated, although a weak emission from the accretion stream could be still present. Cyclotron radiation, usually dominating the V and R bands, is negligible thus corroborating the possibility that AMHer was in an off-accretion state. The X-ray emission during the inactive state is consistent with coronal emission from the secondary late type star. |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.314.8038; http://arxiv.org/pdf/astro-ph/0209538v1.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.314.8038 http://arxiv.org/pdf/astro-ph/0209538v1.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.FC6F55B9 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |