H-alpha line in the early-type stars (O, Be)

[Bajastro]

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:

Edited January 27, 2020 by Bajastro

[robin_astro]

Don't forget to add your Be star spectra to the BeSS database

http://basebe.obspm.fr/basebe/

and consider adding other targets to the BAA database

https://britastro.org/specdb/data.php

 

Cheers

Robin