Star data format explained
It looks like XEphem's format of databases as described in the manual's file format description. Does the filename end in .edb ? That is a common extension for these sort of files. Assuming it is, then the format breaks down as (taking the first line for example):


A name (Akamar)
A "type designation" for the sort of object, in this case f for fixed (as opposed to orbital elements or a bound satellite)
A subfield for the fixed type indicating it's a Star
The spectral type of the star (A3)
Right ascension (RA) and proper motion in RA (02:58:15.696 and -44.6 milliarcsec/year)
Declination and proper motion in Dec (-40:18:16.97 and 19.0 milliarcsec/year)
Magnitude (brightness) of the object (3.2)
Reference epoch for the proper motions (2000.0)