getHbgrid | R Documentation |
Import stellar track data for a grid of HB models starting from ZAHB and ending at the onset of thermal pulses.
getHbgrid(z, y, ml, afe, baseURL="ftp://cdsarc.u-strasbg.fr/pub/cats/J/A+A/540/A26/")
z |
the initial metallicity of the model to get. Allowed values are 0.0001, 0.0002, 0.0003, 0.0004, 0.0005, 0.0006, 0.0007, 0.0008, 0.0009, 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01. |
y |
the initial helium abundance of the model to get. Allowed values are 0.25, 0.27, 0.33, 0.38, 0.42. |
ml |
the mixing-length of the model to get. Allowed values are 1.7, 1.8, 1.9. |
afe |
the alpha-enhanchment of the model to get. It can be one of
|
baseURL |
the URL of the base directory of the database from where get the models. |
As a sanity check, the function performs a consistency test on the parameters
z
, y
, ml
, afe
by a call to
testComposition
.
By default the function requires an Internet access for data
gathering. Tracks and isochrones are downloaded from the on-line
repository CDS
(http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/540/A26).
It is also possible to gather data from a local download of the
catalog, specifying as baseURL
the root directory of the
download. In this case the structure of the catalog and the names of
files and directory must be preserved.
getHbgrid
returns an object of class hbset
, i.e.
a list with one element of class hb
for each HB model.
If baseURL
points to an invalid path or CDS ftp site is
unavailable
the function returns NA
and issues a warning.
M. Dell'Omodarme, G. Valle, S. Degl'Innocenti, and P.G. Prada Moroni (2012). The Pisa Stellar Evolution Data Base for low-mass stars. Astronomy and Astrophysics, 540, A26.
getTrk
, getHb
, getIso
, getTrkSet
.
### slow! ## Not run: hbgrid <- getHbgrid(0.002, 0.25, 1.7, 0) ### get data from local directory /data hbgrid <- getHbgrid(0.002, 0.25, 1.7, 0, baseURL="/data/") ## End(Not run)
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