British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

BAA Community

R Boo: Mira variable with emission lines


Expand image

About this observation
Kevin Gurney
Time of observation
21/03/2018 - 02:32
R Boo, HD 128609
Observing location
West Sheffield
Altair Astro 10in RC truss tube
Alpy 600 Spectrograph
Mesu 200 mount
Atik 460EX
12 x 120sec sub-exposures

R Boo is a Mira variable which has an interesting spectrum (class M8e). It shows the TiO molecular bands characteristic of class M but, more interestingly, shows emission lines at the Hydrogen Balmer series wavelengths. The spectrum attached was taken when the star was around magnitude 7.5-8 (best estimate from AAVSO website). The emission lines are clearly visible down to H9, but curiously H-epsilon is absent. Perhaps there is a nearby absorbtion line which blends with it to cancel it out?

Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.