[vsnet-chat 1539] Re: Comparison star of R CrB

[Taichi Kato <tkato>]

Re: Comparison star of R CrB

Dr. Schweitzer wrote:

> The AFOEV chart for R CrB was drawed between 1925 and 1930 with the same
> sequence as the AAVSO chart. The concerned star is marked mv 7.2 on our chart
> like the BAA chart and the old AAVSO chart.

   I wonder whether the AFOEV will or may change the magnitude of this
comparison star in future.  And I wonder how many observers cuurently use
the magnitude of 7.4 (from the new edition of the AAVSO Atlas, or from
Hipparcos photometry).  In the Japanese case, at least some observers
predominantly use Hipparcos/Tycho V magnitudes, others the AAVSO Atlas
Second Edition as a convenient source of comparisons for binocular
variables.  The use of mag 7.4 seems to become prevailing since the last
year, as R CrB spent a while around this magnitude.

Regards,
Taichi Kato

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp