Hi all,
yestarday night I took R Leo spectrum (in blue). Compared with another spectrum I took on december 2024 (in green) it is obvious that a cospicuous Halpha line is there. Other spectra in AVspec Record don’t show any Halpha line. I don’t know in detail R Leo, could someone expain if it is a normal behaviour?
Thank you in advance.
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Did you do all the standard checks of the source image(s)?
Got a star? Got a hot/warm pixel?
If I remember some LPVs show Balmer emmisions but not as strong as your “line”.
Here is google return with some info to start you down the road of “research”.
Jim (DEY)
There is substantial literature going back many decades (actually more than a century) on the variation of emission lines in Miras, including in the AAVSO journal. A very recent starting place is David Boyd’s thorough introduction in the Journal of the BAA:
\Brian
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Deleted in order not to hijack Rosario’s original message
Apologies
R Leo is a Mira variable, which are known to have hydrogen lines in emission, particularly around maximum light. In December 2024, R Leo was still in its ascending branch, so no emission lines are expected. Currently, the star is approaching minimum, so it is a little surprising to show an emission line in this phase.
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