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[vsnet-obs 7476] novae and Cep X-4
- Date: Sun, 21 Sep 1997 18:34:29 +0400
- To: vsnet-obs@kusastro.kyoto-u.ac.jp
- From: "Vitaliy P. Goranskiy" <goray@sai.msu.su>
- Subject: [vsnet-obs 7476] novae and Cep X-4
- Sender: owner-vsnet-obs@kusastro.kyoto-u.ac.jp
1) Photoelectric observations of novae and related objects.
V723 Cas
JD hel 24... V B U Observatory-
Device-
Observer
50709.278 11.829 11.953 11.287 Mo-ShV-G 3 obs. Var transparency.
+/-0.043 0.027 0.006
V4334 Sgr
50711.202 11.015 - - Mo-ShV-G 3 obs.
+/-0.009
2) History of Cep X-4.
Be binary star, the candidate by Roche et al. IAUC 6698, 1997 of X-ray
pulsar Cep X-4, was identified and estimated on 140 plates of Sternberg
Institute plate collection in the time range JD 2434117-49627. The star
was found to vary between 15.2 and 15.8 B. No long time rate changes
of mean light level were found like those, observed in other X-ray Be
binaries (V725 Tau, BQ Cam). Frequency analisys shows only single
possible period 0.6717867 days with small periodic content of 0.15 mag B
(total amplitude). This period should be verified.
Photoelectric observations of comparison stars and Cep X-4:
R.A. 2000 Decl. V B
c 21 39 33.0 +57 01 52 11.14 12.33 GSC-star
k 21 39 04.7 +56 56 59 9.13 9.38 "
1 21 39 34.0 +56 58 00 13.69 14.33 "
2 21 39 10.4 +57 00 02 14.30 16.0
Cep X-4 21 39 30.6 +56 59 13
2450687.3426 14.28 15.2 Mo-ShV-G,Ka
.3514 14.35 15.5 Mo-ShV-G,Ka
The photoelectric observations were made with 70-cm reflector (Mo)
and UBV photometer by Shugarov and Volkov (ShV) by Goranskij (G) and
Karitskaya (Ka).
V.P.Goranskij, Sternberg Institute, Moscow, Russia.