منابع مشابه
Astronomy and Astrophysics Chandra Letgs Observation of the Active Binary Algol
A high-resolution spectrum obtained with the low-energy transmission grating onboard the Chandra observatory is presented and analyzed. Our analysis indicates very hot plasma with temperatures up to T ≈ 15 − 20 MK from the continuum and from ratios of hydrogen-like and helium-like ions of Si, Mg, and Ne. In addition lower temperature material is present since O vii and N vi are detected. Two me...
متن کاملThe ROSAT Bright Source 1RXS J201607.0+251645: An Active Algol-type Binary
1RXS J201607.0+251645 is identified to be an eclipsing binary. We present the preliminary observations in V band with the 0.6-m telescope for three years and the extensive observations in V and R band with the 0.8-m telescope for six nights, respectively. The light curve of the system is EB type. Five light minimum times were obtained and the orbital period of 0. 388058(±0. 00044) is determined...
متن کاملXMM - Newton observation of the eclipsing binary Algol
We present an XMM-Newton observation of the eclipsing binary Algol which contains an X-ray dark B8V primary and an X-ray bright K2IV secondary. The observation covered the optical secondary eclipse and captured an X-ray flare that was eclipsed by the B star. The EPIC and RGS spectra of Algol in its quiescent state are described by a two-temperature plasma model. The cool component has a tempera...
متن کاملTHE CONSTITUTION OF VITAMIN Kz*
The isolation of vitamin Kz as a yellow crystalline compound melting at 53.5-54.5” has recently been reported from this laboratory (McKee, Binkley, MacCorquodale, Thayer, and Doisy, 1939; McKee, Binkley, Thayer, MacCorquodale, and Doisy, 1939). From the analytical data it was impossible to decide definitely on a formula for vitamin Kz. The formula C&H5402 was used for all calculations, although...
متن کاملAlgol-Genius
Algol-Genius, an Algol 60 implementation with features from COBOL, was the brainchild of Börje Langefors. In 1964, assembler was the dominant programming language, but Algol-Genius broke that trend among Datasaab D21 customers. Algol-Genius programs were still in production in the late nineties.
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Australia
سال: 2001
ISSN: 1323-3580,1448-6083
DOI: 10.1071/as01028