Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-16
Astron.Astrophys. 416 (2004) 281-290
Astronomy and Astrophysics
Astrophysics
10 pages, Online material: 8 pages (online material is included in the file). Accepted by A&A
Scientific paper
10.1051/0004-6361:20034466
We report a detailed analysis of the coronal abundance of 4 stars with varying levels of activity and with accurately known photospheric abundances. The coronal abundance is determined here using a line flux analysis and a full determination of the differential emission measure. Photospheric abundance values are taken from literature works. Previous coronal abundance determinations have generally been compared to solar photospheric abundances; from this a number of general properties have been inferred, such as the presence of a coronal metal depletion with an inverse First Ionization Potential correlated with activity level. Here we show that, when coronal abundances are compared with real photospheric values for the individual stars, the resulting pattern can be very different. Also, we present evidence that, in some cases, the coronal metal abundance may not be uniform in the corona; in particular it can vary with the temperature of the emitting plasma.
Favata Fabio
Micela Giuseppina
Sanz-Forcada Jorge
No associations
LandOfFree
Coronal versus photospheric abundances of stars with different activity levels 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 Coronal versus photospheric abundances of stars with different activity levels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coronal versus photospheric abundances of stars with different activity levels will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-635169