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[vsnet-chat 3] Mira comparison stars
- Date: Tue, 28 Jan 1997 07:53:53 -0500 (EST)
- To: vsnet-chat@kusastro.kyoto-u.ac.jp
- From: hz642@cleveland.Freenet.Edu (Robert J. Modic)
- Subject: [vsnet-chat 3] Mira comparison stars
- Reply-To: hz642@cleveland.Freenet.Edu (Robert J. Modic)
- Sender: owner-vsnet-chat@kusastro.kyoto-u.ac.jp
Regarding Alpha Cet and Beta Ari as comparison stars for Mira,
Alpha Cet has a B-V of 1.64 and Beta Ari has a B-V of 0.13. If
observers viewed these stars in focus and with direct vision, Alpha
Cet would appear 0.2-0.3 mags brighter than its V mag. Viewing
these stars out of focus and with averted vision should eliminate
this problem. Alpha Cet is a good comparison star for Mira since
its color is roughly the same as Mira's. Beta Cet (V=2.04, B-V=1.02)
is another good comparison star.
Regards,
Robert J. Modic
AAVSO
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