3
$\begingroup$

I came across a website saying that classical T Tauris have an "EW(Hα) > 5 angstroms".

Does anybody know what "EW" means?

Thanks.

Improve this question
$\endgroup$

1 Answer 1

Reset to default
7
$\begingroup$

"EW" stands for Equivalent Width. The equivalent width of a spectral line is essentially the range of continuum one would integrate over to get the same flux as the spectral line.

In your case, this is the Hα line.

Improve this answer
$\endgroup$
2
  • 1
    $\begingroup$ +1, but for future readers, the formula would be nice :) $\endgroup$
    – pela
    Commented Apr 20, 2016 at 8:59
  • $\begingroup$ I agree with you, @pela. It would be nice to have a formula to back it up. $\endgroup$
    – Questioner
    Commented May 3, 2021 at 16:48

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .