Advances in Astronomy and Space Physics, Volume 5, Issue 1, PP. 21-23 (2015)
doi: 10.17721/2227-1481.5.21-23
doi: 10.17721/2227-1481.5.21-23
High-frequency variations of hydrogen spectral lines
in the B3V star η UMa
in the B3V star η UMa
Main Astronomical Observatory of NAS of Ukraine, Akademika Zabolotnoho str., 27, 03680 Kyiv, Ukraine
Abstract
We reported the detection of high-frequency variations in the hydrogen Balmer lines in the hot star η UMa of spectral class B3V. Spectral observations of η UMa were carried out with slitless spectrograph (R∼100) installed on the 60 cm Carl Zeiss telescope in the Andrushivka Observatory. Spectra were obtained with a time resolution in the sub-second range. It has been found that the η UMa shows rapid variations in the hydrogen lines Hα, Hβ, Hγ, as well as variations in the atmospheric oxygen lines. The intensity variations in the hydrogen lines varies from 0.2% to 0.5%, and that of the oxygen lines is approximately 2%.
Keywords:
instrumentation: detectors, methods: observational, techniques: image, processing techniques: spectrometric, stars: imaging