Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-06-04
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A, 8 pages, 5 figures
Scientific paper
10.1051/0004-6361:200809690
The disagreement between helioseismology and a recent downward revision of solar abundances has resulted in a controversy about the true neon abundance of the Sun and other stars. We investigated XMM-Newton and Chandra high-resolution X-ray spectra of weakly and moderately active stars (log L_x/L_bol = -5...-7) and determined their coronal Ne/O abundance ratio by using two linear combinations of strong emission lines as well as a global-fitting method. The sample stars show a correlation between their Ne/O ratio and stellar activity in the sense that stars with a higher activity level show a higher Ne/O ratio. We find that the Ne/O ratio decreases in our sample from values of Ne/O~0.4 down to Ne/O~0.2, suggesting that ratios similar to 'classical' solar values are rather common for low activity stars. A significantly enhanced neon abundance as the solution to the solar modeling problem seems unlikely. We find no indications of a peculiar position of the Sun among other stars.
Favata Fabio
Robrade Jan
Schmitt Juergen H. M. M.
No associations
LandOfFree
Neon and oxygen in low activity stars: towards a coronal unification with the Sun does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Neon and oxygen in low activity stars: towards a coronal unification with the Sun, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neon and oxygen in low activity stars: towards a coronal unification with the Sun will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-154566