Affiliation
American Association of Variable Star Observers (AAVSO)
Fri, 12/22/2023 - 22:33
Hello,
When checking in VSX some information about the star CW Cru, one of the targets I monitored recently, I noticed that it is classified as belonging to the "em" spectral class. Is there an "em" spectral class?
Simbad reports it in the B0IIIe C spectral class (Aidelman et al., 2018, Astronomy and Astrophysics, volume 610A, 30-30).
If anyone could comment, please.
Thanks.
Ari
I think the following applies: e means emission lines present; m means enhanced metal features.
Roy
Ari, you have posted the same question both to the Spectroscopy and the VSX forums. You are getting different replies in each forum. I recommend posting to one forum only to avoid this.
Let's continue the thread in:
https://www.aavso.org/there-em-spectral-type
Roy, em just means "emission".
When no spectral class is given and only emission lines are reported, you can just find "em".
Cheers,
Sebastian