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CC Ser Eclipsing Binary Star

SET's picture
Joined: 2010-07-23

Hello Folks,


Yes, I'm back in the swing of things. I have moved back up to Amish country in NE Ohio. I am now back using the telescopes at the Mahoning Valley Observatory in Braceville.

Last night I observed CC Ser for the first time ever. I notice the range on the AAVSO chart says 11.1-11.7. However, I observed it from 10.8 to 11.3, using the comp stars on the chart. It is a very easy star to find, right off of Beta Ser. Mike or Sebastian, can you check on that mag range and let me know what's up, please.

I'll be back involved in the Forum, now that I'm settled in.


Chris Stephan  SET

Mahoning Valley Observatory

Braceville, OH


CC Ser's range
Sebastian Otero's picture
Sebastian Otero
Joined: 2010-09-19

Hi, Chris,

Welcome back and good luck at your new (old?) place ;)

I checked the star's range against ASAS-3 data and ended up as 11.05 - 11.61 V instead of 11.14 - 11.68. So it was slightly brighter but not so much as your observations suggest.
I checked the 3 comp stars in this field.

103 = 10.290 (0.016) ASAS-3; 10.295 (0.066) APASS; B-V= 0.69
114 = 11.349 (0.029) ASAS-3; 11.288 (0.116) APASS; B-V= 0.94
118 = 11.728 (0.038) ASAS-3; 11.768 (0.037) APASS; B-V= 0.71

The stars were slightly brighter than their labels (the same as the variable star itself) but not enough to account for a 0.3 mag. discrepancy.
Maybe it is a color response issue. The variable has B-V= 0.3 so it is bluer than its comp stars.

Best wishes,

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484