... Tonight's Sky . ... The Magazine . ... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Bright planets meet at dusk . ... Astronomy magazine subscribers can read the full article for free. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter....

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... The evolution of a binary system is considered as a sequence of stages the duration of which are defined by the shortest evolutionary time-scale of one of the binary components (see the list of the evolutionary states of stars in Sections 3 and 4). ... Then the code finds a new stage the binary should transit to, with this stage being determined by the evolutionary states of both components, and calculates it. ... However, one can use the algorithm described above to model their evolution. ...

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... It is known from preliminary observations that the period of this binary star is more than 8 hours but less than 12 hours. O. Struve & V. Zebergs (1959, ApJ, 130, 783) measured radial velocities of the two components and get the results presented at the enclosed "sheet of data". ... Plot graph of the velocities of components vs time. 8.2. Find exact orbital period of the components. ... Find exact orbital period, orbital radius and masses of the two components. ...

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Polarization in the 530.3 nm emission line and coronal magnetic field structure O.G. Badalyan1 , V.N. Obridko1 and J. Sykora2 ґ 1 Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, 142092 Troitsk, Moscow Region, Russia 2 Astronomical Institute of the Slovak Academy of Sciences 059 60 Tatranskґ Lomnica, The Slovak Republic a Received: January 15, 2002 Abstract. ... Key words: coronal green line ­ polarization characteristics ­ coronal magnetic field Contrib. ...

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