Short time-scale variability in the spectrum of O-B hot stars

S.M.Pokhvala
Main Astronomical Observatory of NAS of Ukraine, Akademika Zabolotnoho str., 27, 03680 Kyiv, Ukraine

We reported the first results of observations of short time-scale variability in the hydrogen Balmer lines and HeI lines  in the hot O-B stars (η UMa, ζ Ori). Spectral observations were carried out with low-resolution slitless spectrograph (R ~ 200) installed on the 60 cm Carl Zeiss telescope in the Andrushivka Observatory, Ukraine. Spectra were obtained with a time resolution in the sub-second and second range. It has been found that the hot stars shows rapid variations in the hydrogen lines Hβ, Hγ, Hδ, Hε, Hη and helium lines HeI(4472Å), HeI(5016Å) HeI(5876Å) as well as variations in the atmospheric oxygen lines. This can be interpreted that their pulsations are non-radial pulsations and strong stellar wind.

New place of The Nightspirit Observatory!!!

Good news!

Now, The Nightspirit Observatory has new place!
In July 2016, I and my wife relocated to the our apartments in Kyiv, in the surroundings of the city.
Nearly, half year my telescope didn't work. Some episodical observations was obtained in period from July and till December. But real observations was started in January 2017.

How it was on the start...

First visual observations in summer

Some tests with newtonian telescope

Preperation for observations in January 2017:

First testing of hand made pier 

And finish:

 

               

Observing conditions

The Observatory has South side with stationary pier. Also North side available too in the other side of the apartment in expedition mode with mobile mount (EQ3/EQ5 on tripod).

South side

The South night sky available  from 110° till 240° with senter in Meridian.

North side

The North night sky has big light pollutions of Kyiv near horizon (15°).

Stars of 5 mag are avaliable for visual observations (Without optics). The southern side goes beyond the city limits (green zone of light pollutions).  Sometimes Milky Way is avaliable on the dark background.

Visual limit magnitude:

m_visual = 5.15 (star Sp A3V)

m_nebula = 8

m_mto = 10.1

m_guide_sw5x9 = 8.1

m_tair-3s = 10.1

So, Clear Sky and Best Regards!