In: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no. 2
Y. Takeda - Y. Kawanomoto - N. Ohishi
Detaily:
Rok, strany: 2008, 157 - 162
Kľúčové slová:
stars: abundances, stars: atmospheres, stars: early-type, stars: fundamental parameters, stars: rotation, stars: individual: Vega
URL originálneho zdroja: http://www.astro.sk/caosp/Eedition/Abstracts/2008/Vol_38/No_2/pp157-162_abstract.html
O článku:
In order to establish Vega's absolute rotational velocity
(ve) separated from the inclination angle (i), while
making use of the fact that information on rotation-induced gravity
darkening is reflected in the characteristic spectral line shapes,
we conducted a detailed profile study on a large number of weak lines
based on the very high S/N spectrum data, and concluded that
ve ≃ 175 km s-1
(with i ≃ 7°) is the best solution.
It also turned out that the conventionally derived abundances from
Fe I lines by using classical model atmospheres tend to be
overestimated by up to ∼ 0.2 dex, though this effect is
insignificant for Fe II lines. Such gravity-darkening corrections
may have an appreciable impact on the Fe I/Fe II ionization
equilibrium as well as on the determination of the microturbulence.
Ako citovať:
ISO 690:
Takeda, Y., Kawanomoto, Y., Ohishi, N. 2008. Rotational feature of Vega and its impact on abundance determinations. In Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no.2, pp. 157-162. 1335-1842.
APA:
Takeda, Y., Kawanomoto, Y., Ohishi, N. (2008). Rotational feature of Vega and its impact on abundance determinations. Contributions of the Astronomical Observatory Skalnaté Pleso, 38(2), 157-162. 1335-1842.