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Apr
23
awarded  Popular Question
Feb
10
comment Why do pre-main sequence stars show lithium in absorption?
Wouldn't the recombination radiation have some line emission as well, as the electron cascades down through the energy levels on its way to the ground state? Or in other words, isn't the $n=3$ level populated because of recombination (even if indirectly)?
Feb
10
comment Why do pre-main sequence stars show lithium in absorption?
I would expect the H$\alpha$ emission, in both cases, is from recombination, rather than line emission from a population of hydrogen somehow being held in an excited state. I just want to confirm that this is the case.
Feb
10
accepted Why do pre-main sequence stars show lithium in absorption?
Feb
10
revised Why do pre-main sequence stars show lithium in absorption?
The alpha in H-alpha is *never* put as a subscript in the astronomy literature. I corrected the previous edit to follow normal astronomy conventions.
Feb
9
asked Why do pre-main sequence stars show lithium in absorption?
Oct
8
awarded  Excavator
Oct
8
revised Are galaxies moving away from us faster than before?
fixed error in equation, changed dot to times
Oct
8
suggested approved edit on Are galaxies moving away from us faster than before?
Oct
6
accepted What is the brightest star (relative magnitude) in M31?
Sep
29
comment What is the brightest star (relative magnitude) in M31?
Yes, I am discounting supernovae. I am specifically wondering about stars Gaia could look at (so, ideally will be visible over a 5 year period).
Sep
28
asked What is the brightest star (relative magnitude) in M31?
Sep
28
awarded  Yearling
Aug
30
accepted What is a Seyfert galaxy?
Aug
28
asked What is a Seyfert galaxy?
Aug
20
accepted What is the largest hydrogen-burning star?
Aug
20
comment What is the largest hydrogen-burning star?
Thanks for pointing that out. I updated the question to be core hydrogen burning.
Aug
20
revised What is the largest hydrogen-burning star?
added 15 characters in body
Aug
20
comment What is the largest hydrogen-burning star?
I mean main sequence, I think.
Aug
20
asked What is the largest hydrogen-burning star?