January 2003
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Observatory report

Whats New?

News from VSNET (Printed with Permission)

VSNET (Variable Star Network) is an international variable star observing network, covering various areas of novae, supernovae, cataclysmic variables (CVs), X-ray transients, and other classical eruptive, pulsating, and eclipsing variables.

VSNET is one of invited contributing organizations to the SkyPub AstroAlert system. The "News from VSNET", mainly focusing on recent remarkable activities of CVs and related systems, is issued on a weekly basis, except on occasions of extremely urgent or transient events. Please refer to the VSNET Home Page for more details of events and objects listed. VSNET

Home Page: http://www.kusastro.kyoto-u.ac.jp/vsnet/

We would sincerely appreciate volunteers who would join the VSNET Collaboration team to study the wonders of these exotic variable stars. To join the VSNET campaign collaborative list, send an e-mail to vsnet-adm@kusastro.kyoto-u.ac.jp (VSNET administrator) with a line "SUBSCRIBE vsnet-campaign."

Regards, Taichi Kato

On behalf of the VSNET administrator team

AY Psc (RA = 01h36m55s.44, Dec = +07d16'29".7)

According to AAS 201 (40.07), AY Psc is found to be (probably the first, except the rather atypical EM Cyg) eclipsing Z Cam-type dwarf nova.

Please observe this object closely (on nightly basis, as in other DNe), and regularly monitor the eclipses. Catching the ingress and egress phases of standstills is extremely important (when such a phase is suspected, please use vsnet-alert to announce the detection) in testing the theories of standstills (vsnet-campaign-dn 3087).

GY Cnc (RA = 09h09m50s.5, Dec = +18d49'47")

A possible outburst (14.7mag) of the deeply eclipsing dwarf nova, GY Cnc was reported on December 3 by M. Simonsen (vsnet-campaign-dn 3068). The outburst was confirmed at V=13.5 on December 4.99 by A. Oksanen (vsnet-campaign-dn 3072, 3077). The object has kept brightening on December 8, which indicates a slowly rising outburst (vsnet-campaign-dn 3095). SN 2002jj (RA = 03h39m29s55, Dec = -13d06'55".8) IC 340, a host galaxy of SN 2002jj is a lenticular galaxy. The expected maximum for typical SN Ia is mag about 15.6. Lenticular galaxies are believed to produce SNe Ia only. On the other hand, the reported magnitudes (16.5mag) suggest that it does not like SN Ia but it can be of type IIP in the plateau phase, though it seems somewhat brighter than typical SNe II (vsnet-campaign-sn 513).

V630 Cyg (RA = 21h34m59s.21, Dec = +40d40'18".5)

A possible superoutburst was detected on December 4 (vsnet-campaign-dn 3079). The outburst was confirmed on December 7, which indicates that it is a genuine superoutburst (vsnet-campaign-dn 3080).

V1159 Ori (RA = 05h28m59s.52, Dec = -03d33'52".8)

The superoutburst is still ongoing (vsnet-campaign-dn 3096).

RX And (RA = 01h04m35s.55, Dec = +41d17'58".0)

A new outburst was detected. It started on December 6 when it was 12.8mag as reported by T. Kinnunen, and then reached 11.4mag by M. Simonsen. The outburst cycle may be unexpectedly short (vsnet-campaign-dn 3085).

MisV1147 (RA = 22h54m03s.78, Dec = +58d54'02".1)

The object brightened up on Dec. 1 images taken at the Kyoto team. The fading episode from the end of November seems to be slightly earlier than expected from the past (semi-?)periodicity (vsnet-campaign-unknown 132). The observation by the Kyoto team on December 6 revealed the next fading. It suggests that the fadings are not strictly periodic, but quasi-periodic (vsnet-campaign-unknown 137, 148, 150, 151). D. West reported that de-reddened colors (UBV) of this object indicate a B-type star (vsnet-campaign-unknown 133, 134, 135, 136, 139, 140). C. Lloyd commented that it is quite likely that this is a binary, possibly with some true periodic behaviour buried in the variations (vsnet-campaign-unknown 138). Based on measurements by A. Henden, the object gets redder in V-R and R-I, but bluer in B-V as it fades (vsnet-campaign-unknown 139, 141). T. Kato commented that it is one of the very signatures of deep Herbig Ae/Be-type fadings (vsnet-campaign-unknown 142). J. Greaves mentioned that to measure polarization would be important to determine whether the object is a Herbig Ae/Be star or not (vsnet-campaign-unknown 143, 144, 145, 146, 147, 149).

Charts and preliminary sequence presented by M. Simonsen:



The Warren Astronomical Society Paper
Volume 35, Number 1 January 2003