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Showing results for tags 'alcyone'.
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1. Alcyone (Eta Tauri, η Tau, 25 Tau) in the Pleiades open cluster, spectral type B7IIIe+A0V+A0V+F2V. This star is a multiple system, but my goal of observation was the H-alpha profile of the main component: Horizontal axis scaled to radial velocity: 2. Pleione (28 Tau, BU Tau) also in M45, spectral type B8Vne, variable star, the brightness changes in range: 4.83 - 5.38 V. This is the faintest star, which I observed with using APO 107/700 & Low Spec spectrograph 1800 l/mm. It was difficult, but obervation was positive (high gain, exposure time 4 min): 3. Tianguan (Zeta Tauri, ζ Tau), spectral type B1IVe+G8III: (mark ":" according to the VSX database means uncertainty). This is an eclipsing binary with variability type E/GS+GCAS, period is 133 d. The brightness changes in range: 2.80 - 3.17 V. 4. Cih, Tsih (γ Cas), spectral type B0.5IVpe, variable star with a magnitude range of 1.6 to 3 V: 5. Alnitak (Zeta Orionis, ζ Ori), spectral type O9.5Ibe+B0III. Variable star with a magnitude range of 1.74 to 1.77 V. Spectral lines have characteristic P Cygni profile, below H-alpha: