[vsnet-alert 4160] TmzV34 = RX J0915.8+0900 brightening

[Patrick Schmeer <extpasc@rz.uni-sb.de>]

TmzV34 = RX J0915.8+0900  (CV) 

TmzV34  20000203.444  154  Scp
TmzV34  20000204.292  152  Scp
TmzV34  20000205.319  151  Scp
TmzV34  20000207.432  144  Scp
TmzV34  20000208.319  142  Scp
TmzV34  20000210.306  140  Scp
Sequence:   VSNet (vsnet-chart 143)
Instrument: IRO (0.5-m RCT + AP-8)

This catacylsmic variable is currently in a bright state (outburst?).
The most recently observed (but unconfirmed) brightening was detected
by Tsutomu Watanabe on 1999 Apr. 8.596 UT (see below).

USNO-A2.0 data: 091551.781 +090050.80 (2000.0) 14.6 14.7 

Time-resolved photometry and spectroscopy are urgently required.

Regards,
Patrick

P.S.:
----------------------------------------------------------------------------
Excerpt from vsnet-obs 10504 (1998 Mar. 22):

  Kesao Takamizawa (Nagano, Japan) reports the following discoveries of
variable stars (TmzV34-V36)

  TmzV34 = GSC819.892 091551.69 +090049.9 (2000.0)
         = USNO0975.06284313 091551.769 +090050.92 14.5 15.6
         = 1RXS091552.3+090056 ?

         Takamizawa reports that the star is visible on Real-Sky CD-ROM
         at magnitude ~15.  Irregular-looking light variation and the likely
         ROSAT identification strongly encourage further observations.

object         YYMMDD(UT)   mag  code
TmzV34         940306.531  149p  Tmz.VSOLJ
TmzV34         940428.524  148p  Tmz.VSOLJ
TmzV34         940512.530  <145p  Tmz.VSOLJ
TmzV34         941103.728  <150p  Tmz.VSOLJ
TmzV34         941130.715  131p  Tmz.VSOLJ
TmzV34         941130.718  131p  Tmz.VSOLJ
TmzV34         950222.495  146p  Tmz.VSOLJ
TmzV34         960113.571  147p  Tmz.VSOLJ
TmzV34         960309.485  145p  Tmz.VSOLJ
TmzV34         970929.808  <145p  Tmz.VSOLJ
TmzV34         971012.776  144p  Tmz.VSOLJ
TmzV34         980102.628  146p  Tmz.VSOLJ
TmzV34         980318.569  146p  Tmz.VSOLJ
----------------------------------------------------------------------------
Excerpt from vsnet 1361 (1998 Mar. 24):

New CVs from "The Hamburg/RASS Catalogue of Optical Identifications"

RXJ0915.8+0900 = 091551.7  +090048 (2000.0)   -  CV
    = GSC819.892 091551.69 +090049.9 (2000.0) 12.99 1
    = USNO0975.06284313 091551.768 +090050.92 (2000.0) 14.5 15.6

  The first line of each star represents Hamburg/RASS identification.
Some of these ROSAT CVs show considerable variation between GSC/USNO/Hamburg
magnitudes.  For example, RXJ0909.8+1849 and RXJ0915.8+0900 were clearly
in outburst or bright state at the epoch of GSC observation, while
RXJ1437.0+2342 was probably in outburst at the time of Hamburg observation.

  Follow-up observations are strongly encouraged!

Regards,
Taichi Kato
----------------------------------------------------------------------------
vsnet-alert 2854 (1999 Apr. 10):

Outburst of TmzV34 = RXJ0915.8+0900

  T. Watanabe (Shizuoka, Japan) reports the detection of the (first-ever
visually observed) outburst of TmzV34 = RXJ0915.8+0900.

  The object was first detected by ROSAT, whose optical identification
as an cataclysmic variable was given in "The Hamburg/RASS Catalogue of
Optical Identifications" (see also vsnet 1361
  http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet/msg01361.html ).
  The variability of this star was independently discovered (TmzV34) by
K. Takamizawa (Nagano, Japan), who, although initially suggested the
irregular (L) type variability, detected the 1994 Nov. 30 outburst
(at mag 13.1, vsnet-obs 10504,
  http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/obs10000/msg00504.html
).

  YYMMDD(UT)   mag  observer
  990407.616  <134  (T. Watanabe)
  990408.596   136  (T. Watanabe)

  Further observations of the present, and future outbursts of this object
is strongly encouraged.

Regards,
Taichi Kato
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