NGC 7094 is a great planetary in the constellation Pegasus, has a rather low surface brightness but thanks to good reactivity with OIII selective filters, we can easily observe. With 8-inch telescopes it has a rounded appearance with defined contours and a little vague ring structure that is more evident if observed with large telescopes. In photograph appears in all its beautiful, it is very easy to see the structure where the irregular heart shines a bright central star.
NGC 7094 is a planetary nebula high level of excitement because of the presence of a high hot core with 120,000 K Teff, the central star is the most peculiar aspect of this object. Very recent studies, in fact, have encountered a PG1159 spectral class type hybrid. Very recent studies, in fact, have encountered a class PG1159 spectral type hybrid. The type PG1159 stars are poor hydrogen, but show very intense rows absorption of HeII and CIV; in the case of hybrid objects appear intense lines of Balmer series that suggest the presence of photospheric hydrogen. It is very likely that the core of NGC 7094 is in a transient phase that precedes the shutdown of hydrogen in a shell and inserting in the sequence of cooling white dwarf, it is important to perform a constant monitoring.
Interesting level : **** |
