AME

This website gives access to the data used in the paper AME – Asteroseismology Made Easy – Estimating stellar properties by use of scaled models (Lundkvist et al, submitted).

 

We are currently working on an interactive tool which, upon completion, will be made available here. This tool will facilitate the use of AME to anyone who may be interested. The required input parameters will be the metallicity ([Fe/H]), the temperature (Teff) and the large separation (Δν). The output which will be provided by the tool will be the stellar mass (M), radius (R), mean-density (ρ), surface gravity (g) and age (τ).

 

As this web utility is not yet complete, we in the meantime provide the data used to make the plots (found in the appendix of the paper) from which the stellar properties are deduced. Using this information, the figures can be easily reproduced and anyone can plot their own stars in the figures and do interpolation to obtain the stellar parameters. For further information on the method itself we kindly refer to the paper.

 

 

Information about the provided data:

 

There is a separate file for each figure (named tab_category_fignumber in appendix.dat where category can be either mass, density or age). In order to reproduce any given figure, simply plot the data in the file.

 

The columns of a given file contain:

1)                                     x-axis values for the lowest mass and lowest metallicity track used in the figure.

2)                                     y-axis values for the lowest mass and lowest metallicity track used in the figure.

3)                                     x-axis values for the lowest mass  and second-lowest metallicity track used in the figure.

4)                                     y-axis values for the lowest mass and second-lowest metallicity track used in the figure.

5)                                     ….

k)                                     x-axis value for the second-lowest mass and lowest metallicity track used in the figure.

k+1)                                 y-axis value for the second-lowest mass and lowest metallicity track used in the figure.

k+2)                                 x-axis value for the second-lowest mass and second-lowest metallicity track used in the figure.

k+3)                                     ...

Note that the columns have been padded with NaN's to make all coloums in the file equal length. The delimiter between the columns is a blank space.

 

As an example consider the table “tab_density_figA4.dat”. This file contains the information necessary to reproduce Fig. A4 from the appendix. This figure can be used to estimate the density of a star with a mass between 0.7 Msun and 1.2 Msun and a metallicity in the range from -0.3 dex to -0.1 dex. The first column in the file contains the x-axis values for the track with M = 0.7 Msun and [Fe/H] = -0.3 dex. The second column contains the corresponding y-values. The third and fourth columns give the x-values and y-values respectively belonging to the track with M = 0.7 Msun and [Fe/H] = -0.2 dex. The fifth and sixth columns give the same for the track with M = 0.7 Msun  and [Fe/H] = -0.1 dex. The seventh and eight columns give again the x- and y-values respectively, but this time belonging to the track with M = 0.8 Msun  and [Fe/H] = -0.3 dex. This pattern is continued up until the last track with M = 1.2 Msun and [Fe/H] = -0.1 dex which is contained in the columns with numbers 35 and 36.