Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...492l..49t&link_type=abstract
Astronomy and Astrophysics, Volume 492, Issue 3, 2008, pp.L49-L52
Astronomy and Astrophysics
Astrophysics
2
Stars: Evolution, Stars: Oscillations
Scientific paper
Aims: We attempt to develop a new asteroseismic diagram and investigate its characteristics, based on the ratio “r01” of adjacent, average, small separations. Methods: The ratio r01 is defined following the asymptotic formula of stellar p-modes. Using the low-degree, theoretical, numerical value of adiabatic frequencies of stellar model, we compute the ratio r01 and construct an additional asteroseismic diagram. Results: The additional asteroseismic diagram, which is similar to the C-D diagram (i.e. the famous asteroseismic HR diagram, so-called Christensen-Dalsgaard diagram), represents a composite of the average, large separations <Δν> and the ratio r01 of the adjacent, small separations. A distinct separation is identified between the effects of varying both mass and age. The diagram can therefore provide information that is complementary to that provided by a C-D diagram, which can be used to estimate directly both the stellar mass and evolutionary state. Interestingly, the age of star can be derived from the new asteroseismic diagram. Furthermore, we investigate the parameter r01, which can be a useful direct indicator of stellar age.
Bi Shao-Lan
Gai Ning
Tang Yan-Ke
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