X-ray dip monitoring of XB 1916-053

T. Narita, J. E. Grindlay, P. F. Bloser, Y. Chou

研究成果: 雜誌貢獻期刊論文同行評審

6 引文 斯高帕斯(Scopus)


We report on the long-term monitoring of X-ray dips from the ultracompact low-mass X-ray binary (LMXB) XB 1916-053. Roughly one-month interval observations were carried out with the Rossi X-ray Timing Explorer (RXTE) during 1996, during which the source varied between dim, hard states and more luminous, soft states. The dip spectra and dip light curves were compared against both the broadband luminosity and the derived mass accretion rate (Ṁ). The dips spectra could be fitted by an absorbed blackbody plus cutoff power-law nondip spectral model, with additional absorption ranging from 0 to > 100 × 1022 cm-2. The amount of additional blackbody absorption was found to vary with the source luminosity. Our results are consistent with an obscuration of the inner disk region by a partially ionized outer disk. The size of the corona, derived from the dip ingress times, was found to be ∼109 cm. The corona size did not correlate with the coronal temperature, but seemed to increase when M ̇ also increased. We discuss our findings in the context of an evaporated accretion disk corona model and an ADAF-type model.

頁(從 - 到)1007-1012
期刊Astrophysical Journal
發行號2 I
出版狀態已出版 - 20 8月 2003


深入研究「X-ray dip monitoring of XB 1916-053」主題。共同形成了獨特的指紋。