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Date: Thu, 4 Nov 1993 23:25:18 +0200
From: granslo@argo.uio.no
Subject: NAS.VSS Report for 1993 October
Norwegian Astronomical Society - Variable Star Section
***** VARIABLE STARS - REPORT OF 1993 NOVEMBER 4 *****
This report contains selected visual observations by members of NAS.VSS
since 1993 October 1. Time system is U.T. Contributing observers:
DAH = Haakon Dahle (Oslo, Norway); GRL = Bjorn H. Granslo (Fjellhamar,
Norway); LAU = Andreas Lauvstad (Levanger, Norway).
1. NOVAE AND RECURRENT NOVAE
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Variable 1993 UT Magn Obs 1993 UT Magn Obs 1993 UT Magn Obs
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N1993 Aql Oct 13.731 12.6 GRL Oct 17.772 12.7 GRL Oct 22.808 12.4 GRL
T CrB Oct 13.76 10.3 GRL Oct 17.76 10.4 GRL Oct 22.80 10.3 GRL
V1974 Cyg Oct 13.732 12.5 GRL Oct 14.990 12.4 GRL Oct 17.774 12.5 GRL
V1974 Cyg Oct 22.006 12.5 GRL Oct 22.810 12.5 GRL Oct 27.141 12.5 GRL
V1974 Cyg Oct 28.993 12.5 GRL Oct 29.901 12.6 GRL
RS Oph Oct 13.77 11.6 GRL Oct 17.76 11.5 GRL
GK Per Oct 14.12 13.2 GRL Oct 15.00 13.2 GRL Oct 17.12 13.1 GRL
GK Per Oct 22.06 13.3 GRL Oct 26.10 13.4 GRL Oct 27.13 13.2 GRL
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The recurrent novae T Coronae Borealis (NR) and RS Ophiuchi (NR) and the
old nova GK Persei (NA) were detected near minimum. V1974 Cygni (Nova 1992)
is fading slowly. Nova Aquilae 1993 has brightened since 1993 July and its
behaviour resembled that of DQ Herculis (Nova 1934) and QV Vulpeculae
(Nova 1987).
2. DWARF NOVAE
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Variable 1993 UT Magn Obs 1993 UT Magn Obs 1993 UT Magn Obs
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RX And Oct 14.00 13.0 GRL Oct 17.14 <13.1 GRL Oct 22.03 11.0 GRL
RX And Oct 22.86 11.7 GRL Oct 25.02 <13.1 GRL Oct 28.99 <12.5 GRL
Z Cam Oct 13.80 11.5 GRL Oct 15.00 11.5 GRL Oct 17.08 11.6 GRL
Z Cam Oct 17.97 11.6 GRL Oct 22.06 11.7 GRL Oct 22.96 11.7 GRL
Z Cam Oct 25.03 11.6 GRL Oct 26.10 11.6 GRL Oct 27.14 11.6 GRL
Z Cam Oct 28.99 11.6 GRL
SY Cnc Oct 17.13 11.2 GRL Oct 22.07 11.5 GRL Oct 26.11 12.5 GRL
SY Cnc Oct 27.12 12.9 GRL
YZ Cnc Oct 14.03 <13.0 GRL Oct 17.09 12.2 GRL Oct 26.11 <13.3 GRL
YZ Cnc Oct 27.12 <13.6 GRL Oct 29.02 12.6 GRL
HL CMa Oct 26.13 10.9 GRL Oct 27.11 10.9 GRL
SS Cyg Oct 9.83 11.6: LAU Oct 13.77 9.6 GRL Oct 14.99 9.3 GRL
SS Cyg Oct 15.803 8.2: LAU Oct 17.07 8.9 GRL Oct 17.77 8.7 GRL
SS Cyg Oct 21.767 10.5 LAU Oct 21.92 10.6 GRL Oct 22.81 10.7 GRL
SS Cyg Oct 25.04 11.8 GRL Oct 27.13 11.8 GRL Oct 28.99 11.8 GRL
SS Cyg Oct 29.90 11.9 GRL
AH Her Oct 13.77 11.5 GRL Oct 17.76 11.7 GRL Oct 22.81 <12.8 GRL
X Leo Oct 17.15 <12.7 GRL Oct 22.11 <12.7 GRL Oct 26.12 12.3 GRL
X Leo Oct 27.12 12.4 GRL
CN Ori Oct 27.17 12.2 GRL Oct 29.10 12.2 GRL
RU Peg Oct 13.80 11.5 GRL Oct 17.77 11.2 GRL Oct 22.03 11.9 GRL
RU Peg Oct 22.84 12.0 GRL
TZ Per Oct 17.13 13.1 GRL Oct 22.06 13.0 GRL Oct 27.13 13.0 GRL
KT Per Oct 17.12 <13.0 GRL Oct 22.05 <13.2 GRL Oct 25.03 12.4 GRL
KT Per Oct 26.08 12.4 GRL Oct 27.13 12.2 GRL Oct 29.02 12.3 GRL
BZ UMa Oct 26.8 13.1: DAH Oct 27.19 <13.7 GRL
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The following dwarf novae have been detected in outburst: RX Andromedae,
SY Cancri, YZ Cancri (two normal maxima), HL Canis Majoris (bright maxi-
mum), SS Cyg (anomalous outburst of short duration), AH Herculis, X Leonis,
CN Orionis, KT Persei (long outburst) and BZ Ursae Majoris. Z Camelopar-
dalis and TZ Persei were seen at standstill. P. Schmeer has reported that
BZ UMa was undergoing a rare outburst on 1993 Oct 26.072 UT (mv = 12.4).
Apart from an uncertain sighting by H. Dahle it was not seen the following
night. It was subsequently reported in The Astronomer Electronic Circular
No. 785 that BZ UMa was detected by Pietz at mv = 11.5 on Oct 24.953 UT.
3. OTHER VARIABLES
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Variable 1993 UT Magn Obs 1993 UT Magn Obs 1993 UT Magn Obs
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EG And Oct 9.86 7.9: LAU Oct 14.00 7.5 GRL Oct 15.87 7.5 LAU
EG And Oct 17.08 7.5 GRL Oct 21.87 7.5 LAU Oct 22.03 7.5 GRL
EG And Oct 25.02 7.6 GRL Oct 29.00 7.5 GRL
VY CMa Oct 26.17 7.8 GRL Oct 27.17 7.9 GRL
Rho Cas Oct 13.86 4.9 GRL Oct 22.11 4.9 GRL Oct 29.04 4.6 GRL
Rho Cas Oct 31.05 4.6 GRL
R CrB Oct 13.76 7.6 GRL Oct 16.89 7.9 GRL Oct 17.762 7.8 GRL
R CrB Oct 21.874 8.0 GRL Oct 22.799 7.9 GRL Oct 28.802 8.3 GRL
R CrB Oct 29.809 8.2 GRL Oct 30.831 8.3 GRL Oct 31.694 8.3 GRL
R Mon Oct 17.17 11.8 GRL Oct 27.17 11.7 GRL
FU Ori Oct 17.15 9.6 GRL Oct 24.05 9.5 GRL Oct 26.14 9.5 GRL
FU Ori Oct 29.95 9.5 GRL
X Per Oct 13.19 6.4 GRL Oct 17.10 6.4 GRL Oct 22.08 6.4 GRL
X Per Oct 24.05 6.4 GRL Oct 27.08 6.4 GRL Oct 31.05 6.3 GRL
V Sge Oct 13.78 12.0 GRL Oct 17.77 12.5 GRL Oct 22.85 12.2 GRL
V Sge Oct 29.90 12.1: GRL
FG Sge Oct 13.78 11.1 GRL Oct 17.77 11.1 GRL Oct 21.79 11.3: LAU
FG Sge Oct 22.85 11.1 GRL Oct 29.90 11.2 GRL
T Tau Oct 14.00 9.9 GRL Oct 15.94 10.7 LAU Oct 17.09 9.8 GRL
T Tau Oct 22.08 9.8 GRL Oct 25.03 9.8 GRL Oct 27.14 9.9 GRL
T Tau Oct 29.01 9.9 GRL
RR Tau Oct 14.00 12.8 GRL Oct 15.00 12.0 GRL Oct 17.09 11.3 GRL
RR Tau Oct 22.08 11.5 GRL Oct 22.93 11.3 GRL Oct 25.04 11.0 GRL
RR Tau Oct 26.08 11.0 GRL Oct 27.11 11.0 GRL Oct 29.01 11.1 GRL
SU Tau Oct 14.11 <13.5 GRL Oct 17.09 <13.3 GRL Oct 22.08 <13.5 GRL
SU Tau Oct 29.09 <13.0 GRL
BU Tau Oct 13.18 5.2 GRL Oct 15.94 5.4 LAU Oct 17.09 5.2 GRL
BU Tau Oct 21.86 5.5 LAU Oct 22.08 5.3 GRL Oct 26.08 5.2 GRL
BU Tau Oct 28.97 5.2 GRL
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VY Canis Majoris (*) is a red supergiant variable of unique type. Despite a
maximum altitude of 4 degrees (from latitude +60 degrees) it was clearly
seen, due to the transparent atmosphere. R Coronae Borealis (RCB) was about
two magnitudes fainter than its normal maximum brightness in October. The
other R CrB star SU Tauri faded dramatically in 1993 March and is still
very faint. R Monocerotis (INA) is the object connected with Hubble's Vari-
able Nebula (NGC 2261). The nebular variable RR Tauri (INAS) has been
active and the nova-like object V Sagittae (NL) is still faint. FG Sagit-
tae (*) - the central star of the planetary nebula PK 60-7.1 - has partly
recovered from it deep minimum last autumn. The magnitudes of FG Sge are
combined with its mag. 13 companion.
Note: An asterisk (*) denotes a variable of unique type.
Bjorn H. Granslo
Director, NAS.VSS
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