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[vsolj-alert 601] HadV46 = Nova Sct 2000

From owner-vsnet-alert@kusastro.kyoto-u.ac.jp Fri Mar 17 17:14 JST 2000
Date: Fri, 17 Mar 2000 17:04:19 +0900 (JST)
From: Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>
To: vsnet-alert@kusastro.kyoto-u.ac.jp
Cc: yamaoka@rcsvr.rc.kyushu-u.ac.jp, haseda@mxs.mesh.ne.jp,
X-Distribute: distribute [version 2.1 (Alpha) patchlevel=24]
Subject: [vsnet-alert 4416] Possible Nova in Scutum (Re: HadV46 : new variable star (unusual?))
Content-Type: text
Content-Length: 3199

Dear All,

  After the spectroscopy by M. Fujii, HadV46 has turned out to be a
nova.  Congratulations, Haseda-san!  Followup observations are
strongly encouraged for this peculiar object.  I would like to make a
brief summary of this object up to now.  

  Katsumi Haseda, Toyohashi, Aichi, Japan, has discovered an apparent
variable (m_pg 10.6) on Mar. 5.81 UT 10-cm F4.0 twin patrol cameras.
It is confirmed by photograph taken by the discoverer on Mar. 13.819
at m_pg 11.6, and by unfiltered CCD images taken by M. Uemura and T.
Kato on Mar. 14.9 (mag 11.24), which indicates that it would not be a
red variable and is in the rapidly declining phase.  H. Yamaoka
derived the position using this CCD image as 18h34m03s.16,
-14o45'11".46 (equinox 2000.0).  On the DSS1 or 2 images, there is no
star brighter than mag 19, and the most neighbouring star is
USNO0750.13593837 (rmag = 15.7, bmag = 17.1) about 3" west from the
object.  K. Takamizawa has provided the prediscovery magnitude
estimates from his patrol films (see below), which and Haseda's
prediscovery magnitudes show that it has been active since early
February and experienced additional eruptive brightening in early

  Mitsugu Fujii, Kurashiki, Okayama, Japan, has taken a spectra of
this object on Mar. 16.81 with 0.28-m reflector, which shows a strong
H-alpha emission (FWHM = 940 km/s, steeper in blueward) then confirms
that it is indeed a nova.  Emission lines of H-beta and Fe II are also
detected with blueward steepness or weak absorption.  The spectrum can
be seen at http://vsnet1.harenet.ne.jp/~aikow/hadv46.gif.  S. Kiyota,
Tsukuba, Japan, also taken a spectrum which shows H-alpha emission. 

  The information including the sequence of reference stars are can be
seen at http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Novae/hadv46.html. 

  The magnitude estimates up to now:

  YYYYMMDD(UT)   mag  observer
  19990322.782  <131p  (K. Haseda)
  19990413.776  <145p  (K. Takamizawa)
  19990414.781  <145p  (K. Takamizawa)
  19990506.615  <135p  (K. Takamizawa)
  19990511.712  <145p  (K. Takamizawa)
  19990609.663  <145p  (K. Takamizawa)
  19990701.500  <140p  (K. Takamizawa)
  19990706.615  <145p  (K. Takamizawa)
  19990731.491  <145p  (K. Takamizawa)
  19990803.519  <145p  (K. Takamizawa)
  19990831.469  <145p  (K. Takamizawa)
  19990831.483  <130p  (K. Haseda)
  19990909.456  <135p  (K. Takamizawa)
  19990927.415  <140p  (K. Takamizawa)
  19991028.390  <140p  (K. Takamizawa)
  19991029.397  <140p  (K. Takamizawa)
  19991110.376  <140p  (K. Takamizawa)
  20000206.844  120p  (K. Haseda)
  20000209.840  122p  (K. Takamizawa)
  20000211.844  120p  (K. Takamizawa)
  20000216.833  118p  (K. Takamizawa)
  20000302.797   99p  (K. Takamizawa)
  20000305.810  106p  (K. Haseda)
  20000308.780  120p  (K. Takamizawa)
  20000313.816  116p  (K. Haseda)
  20000313.819  116p  (K. Haseda)
  20000314.855  11.24C  (Ouda team)
  20000316.774  12.61B  (S. Kiyota)
  20000316.780   117  (H. Maehara)
  20000316.781  10.81Ic  (S. Kiyota)
  20000316.781  11.87V  (S. Kiyota)
  20000316.785  11.21Rc  (S. Kiyota)
  20000316.801   107  (H. Itoh)

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan

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