Argon Abundances in the Solar Neighborhood: Non-LTE Analysis of Orion Association B-type Stars

Details Argon Abundances in the Solar Neighborhood: Non-LTE Analysis of Orion Association B-type Stars Argon Abundances in the Solar Neighborhood: Non-LTE Analysis of Orion Association B-type Stars

2007-09-13

arxiv.org/abs/0709.2147v2

Astrophys. J. 678 (2008) 1342-1350

Astronomy and Astrophysics

Astrophysics

to appear in Astrophysical Journal, 24 pages, 3 figures; minor corrections after referee's report

Scientific paper

10.1086/587047

Argon abundances have been derived for a sample of B main-sequence stars in the Orion association. The abundance calculations are based on NLTE metal line-blanketed model atmospheres calculated with the NLTE code TLUSTY and an updated and complete argon model atom. We derive an average argon abundance for this young population of A(Ar) = 6.66 +- 0.06. While our result is in excellent agreement with a recent analysis of the Orion nebula, it is significantly higher than the currently recommended solar value which is based on abundance measurements in the solar corona. Moreover, the derived argon abundances in the Orion B stars agree very well with a measurement from a solar impulsive flare during which unmodified solar photospheric material was brought to flare conditions. We therefore argue that the argon abundances obtained independently for both the Orion B stars and the Orion nebula are representative of the disk abundance value in the solar neighborhood. The lower coronal abundance may reflect a depletion related to the FIP effect. We propose a new reference value for the abundance of argon in the solar neighborhood, A(Ar) = 6.63 +- 0.10, corresponding to Ar/O = 0.009.

Affiliated with

Also associated with

No associations

Rating

Argon Abundances in the Solar Neighborhood: Non-LTE Analysis of Orion Association B-type 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 Argon Abundances in the Solar Neighborhood: Non-LTE Analysis of Orion Association B-type Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Argon Abundances in the Solar Neighborhood: Non-LTE Analysis of Orion Association B-type Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-215485