Mag. and Mag.range
I'm new to observing variable stars. The Nova Delphini brought me here! Now I also got interested in observing carbon stars and downloaded a few lists: One from C. Buil based on Stephenson, 1989, catalogue of Cool Galactic Carbon Stars. The other an observation list from the Astroleague. Furthermore I have the GCVS catalogue integrated in my planetarium-software. Plus the VSX from this site. Sometimes I confer to the Simbad-queries too.
What puzzles me: The information varies a lot from source to source. Example: WZ Cas: Mag.range 6.9-11.0 (Buil, Astroleague), 9.4-11.0 p (GCVS), 9.4-11.4 p (VSX)
1. Where do I get the most reliable information with regard to visual observation?
2. What does the mag. code: p mean, photographic I guess, but how does it translate to visual observations?
3. Is there a general rule what the V mag. means with regards to variable stars? Is it the value at maximum or some sort of average? Information varies a lot too. For WZ Cas I got: 6m9 (Buil, Astroleague), 7m06 (Simbad), 7m04 (HD, "Extended Hipparcos"). But this doen' fit he value 9.4p at maximum from VSX for example.
Thanks in advance for help! Also, if you could direct me to a page where I can read about these topics in detail I would be very grateful. I hope this is the right board for this kind of questions, if not I'd ask the moderator to move it to the correct board.
Clear skies for Germany,