Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-16
Astronomy and Astrophysics
Astrophysics
8 pages, 4 figures. Accepted by Monthly Notices of the Royal Astronomical Society, 8 January 2008
Scientific paper
10.1111/j.1365-2966.2008.12937.x
Previous studies of elemental abundances in Mercury-Manganese (HgMn) stars have occasionally reported the presence of lines of the ionized rare noble gas Xe II, especially in a few of the hottest stars with Teff ~ 13000--15000 K. A new study of this element has been undertaken using observations from Lick Observatory's Hamilton Echelle Spectrograph. In this work, the spectrum synthesis program UCLSYN has been used to undertake abundance analysis assuming LTE. We find that in the Smith & Dworetsky sample of HgMn stars, Xe is vastly over-abundant in 21 of 22 HgMn stars studied, by factors of 3.1--4.8 dex. There does not appear to be a significant correlation of Xe abundance with Teff. A comparison sample of normal late B stars shows no sign of Xe II lines that could be detected, consistent with the expected weakness of lines at normal abundance. The main reason for the previous lack of widespread detection in HgMn stars is probably due to the strongest lines being at longer wavelengths than the photographic blue. The lines used in this work were 4603.03A, 4844.33A and 5292.22A.
Dworetsky Michael M.
Patel Kalpana
Persaud J. L.
No associations
LandOfFree
Xenon in Mercury-Manganese Stars 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 Xenon in Mercury-Manganese Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Xenon in Mercury-Manganese Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-159862