[vsnet-j 93] Rho Cas fading

[Taichi Kato <tkato>]

Rho Cas fading

　かつて RCB? ともされていた天体ですが、減光していることが指摘されていま
　す、というか気付いていたのですが日々の仕事に埋もれて情報を出すのを忘れ
　てしまっていました (;_;)。

Date: Tue, 15 Aug 2000 00:34:52 +0200
From: "Bjorn H. Granslo" <b.h.granslo@astro.uio.no>
Subject: [vsnet-alert 5186] Rho Cassiopeiae

Norwegian Astronomical Society - Variable Star Section

              ***** RHO CASSIOPEIAE *****

The following visual observations by undersigned indicate that
Rho Cassiopeiae is markedly fainter than normal:

2000 UT     Observation   Mag.
May  8.04   B-6;E-2 [2]   4.9
Jun  2.98   B-7;E=V [2]   4.9
Aug  5.94   E-4;H+3 [1]   5.3
Aug  7.94   E-4;F+3 [2]   5.3
Aug 13.04   E-6;H+1 [1]   5.5
Aug 13.99   E-6;H+1 [2]   5.5

Observations are Pogson step estimates (one step = 0.1 mag.).
Comparison stars (Identifications from BAA.VSS, V magnitudes from
Yale Bright Star Catalogue, 5th edition): B = 4.16 (Kappa Cas);
E = 4.88 (Sigma Cas); H = 5.56 (HR 9059, 16' W of Sigma Cas).

Can anyone confirm this activity?

Rho Cassiopeiae is a supergiant variable that normally is shining
at magnitude 4.5-5.0. It underwent a major fading episode to mag. 6
during 1945-1947. 

Observer: B. H. Granslo (Fjellhamar, Norway). Instrument: 7x50 B.

                                Yours sincerely,
                                Bjorn H. Granslo
                                   (NAS.VSS)

---

　VSNET報告の観測：

  YYYYMMDD(UT)   mag  observer
  20000621.890    47  (E. Eker)
  20000624.919    47  (M. Reszelski)
  20000708.603    48  (Y. Watanabe)
  20000721.669    48  (T. Kato)
  20000728.535    49  (T. Kato)
  20000730.572    50  (T. Kato)
  20000731.678    50  (T. Kato)
  20000801.613    50  (T. Kato)
  20000803.472    50  (T. Kato)
  20000804.594    50  (T. Kato)
  20000804.674    48  (Y. Watanabe)
  20000805.510    50  (T. Kato)
  20000806.797    52  (T. Kato)
  20000807.508    52  (T. Kato)
  20000808.469    52  (T. Kato)
  20000809.667    50  (T. Kato)
  20000810.692    50  (T. Kato)
  20000811.794    50  (T. Kato)

Regards,
Taichi Kato

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