- #1
Galaxy111
- 4
- 0
Hi all,
Recently I came across an interesting question:
"...Why do astronomers attribute the observed Doppler shifts of a Cepheid variable as pulsation, rather than to some other causes, such as orbital motion? "
OK, I have my ideas about the problem as there is a correlation between e. g. the max. blueshift (spectrum),the max surface temp. (from the Wien-displacement law I guess) and the apparent magnitude (observation) of the star.
But still, is there a way to tell it is a cepheid from its pure spectrum without knowing more?
Greetings
Galaxy![Smile :smile: :smile:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Recently I came across an interesting question:
"...Why do astronomers attribute the observed Doppler shifts of a Cepheid variable as pulsation, rather than to some other causes, such as orbital motion? "
OK, I have my ideas about the problem as there is a correlation between e. g. the max. blueshift (spectrum),the max surface temp. (from the Wien-displacement law I guess) and the apparent magnitude (observation) of the star.
But still, is there a way to tell it is a cepheid from its pure spectrum without knowing more?
Greetings
Galaxy