In: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no. 2
V. Khalack - F. Leblanc - B.b. Behr - G.a. Wade - D. Bohlender
Detaily:
Rok, strany: 2008, 417 - 418
Kľúčové slová:
stars: atmospheres, stars: horizontal branch, stars:, chemically peculiar
URL originálneho zdroja: http://www.astro.sk/caosp/Eedition/Abstracts/2008/Vol_38/No_2/pp417-418_abstract.html
O článku:
The observed slow rotation and abundance peculiarities of certain
blue horizontal branch (BHB) stars suggests that atomic diffusion
can be important in their stellar atmospheres and can lead to
vertical abundance stratification of chemical species in the atmosphere.
To verify this hypothesis, we have undertaken an
abundance stratification analysis in the atmospheres of six BHB
stars, based on recently acquired McDonald CE spectra. Our numerical
simulations show that the iron abundance is vertically stratified in the
atmospheres of two stars in M15: B267 and B279. One star WF2-2541 in
M13 also appears to have vertically stratified iron abundance, while
for WF4-3085 the signatures of iron stratification are less
convincing. In all cases the iron abundances increase towards the
lower atmosphere. The other two stars in our sample, WF4-3485 and
B84, do not show any significant variation of iron with atmospheric
depth. Our results support the idea that atomic diffusion dominates
other hydrodynamic processes in the atmospheres of BHB stars.
Ako citovať:
ISO 690:
Khalack, V., Leblanc, F., Behr, B., Wade, G., Bohlender, D. 2008. Vertical stratification of iron abundance in atmospheres of blue horizontal-branch stars. In Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no.2, pp. 417-418. 1335-1842.
APA:
Khalack, V., Leblanc, F., Behr, B., Wade, G., Bohlender, D. (2008). Vertical stratification of iron abundance in atmospheres of blue horizontal-branch stars. Contributions of the Astronomical Observatory Skalnaté Pleso, 38(2), 417-418. 1335-1842.