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[vsnet-chart-problem 35] V4641 Sgr: possible chart problem information
- Date: Thu, 17 Apr 2003 10:26:28 +0900 (JST)
- To: vsnet-chart-problem@ooruri.kusastro.kyoto-u.ac.jp
- From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
- Subject: [vsnet-chart-problem 35] V4641 Sgr: possible chart problem information
- Delivered-To: vsnet-chart-problem-archive@ooruri.kusastro.kyoto-u.ac.jp
- Delivered-To: vsnet-chart-problem@ooruri.kusastro.kyoto-u.ac.jp
- Sender: owner-vsnet-chart-problem@ooruri.kusastro.kyoto-u.ac.jp
Object: V4641 Sgr
Chart : AAVSO e
Source: vsnet-chat 6233 (Doug West) etc.
Comment:
Mystery solved. Ron Stubbings kindly sent me the Henden/Sumner photometry
for the field. Comparing the AAVSO chart 1813-25e for V4641 Sgr with the
Henden photometry there is approximately a 0.4 mag difference in zero point.
As a result of this, my measurements based on the AAVSO sequence were about
0.4 magnitude fainter than observations based on Henden photometry. I will
start using the Henden sequence for comparison stars.
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