British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

BAA Community Member Pages Kevin Gurney
Image search

Balmer line widths using an Alpy

Image

Expand image

About this observation
Observer
Kevin Gurney
Time of observation
18/03/2018 - 12:00
Object
Type A stars with variety of luminance classes
Observing location
West Sheffield
Equipment
Celestron 8SE
Altair Astro RC10
Alpy 600
Atik 460EX
Celestron 0,63 FR, ASA 0.77FR
Tags
Like This Image
Share

Stuck indoors with a snow storm, I was reading Richard Walkers Spectral Atlas for Amateurs. I came to the part about luminance classes (I thru V)  changing the line width in the Balmer series, and wondered if I could see this in my collection of Alpy 600 spectra. I trawled through it and found a set of A-type candidates (taken at various times). I think I can see the effect here....

Comments

allenhugh10's picture

Hi Kevin,

This is really interesting. In particular eta Leo wonderfully shows the narrower lines in the low density supergiant class I, I shall have to look at some of my Alpy data as well. Would the H-beta line in eta Leo be expected to be weaker especially since it's an A0 star? Fascinating stuff

Cheers

Hugh

k.gurney's picture

Hi Hugh

Apologies for delay - just seen your post..[Better late than never?!]

I think eta Leo is weaker - see plot B which is not auto-scaled...

cheers

Kevin

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.