SETI bioastro: Fw: AstroAlert: News from VSNET

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Date: Mon Feb 04 2002 - 19:47:04 PST

----- Original Message -----
From: Makoto Uemura
Sent: Monday, February 04, 2002 8:32 PM
Subject: AstroAlert: News from VSNET

This Is SKY & TELESCOPE's AstroAlert for Variable Stars

                       *** News from VSNET ***

A very bright supernova SN 2002ap was discovered in M74.
The peculiar nova V838 Mon experiences an unexpected eruption.

  For more detail information about these objects,
see below, "VSNET Weekly Campaign Summary" of the last week.


  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:

  VSNET provides a number of mailing lists, on which various news and topics
are discussed. Subscriptions to the VSNET mailing lists are free of charge;
please refer to the instruction on the above page if a reader needs more
information of the list structure.

  CCD observations of such targets are a relatively easy task for a 20-40cm
telescope; simply take as many CCD frames (with exposure times 10-30 sec)
as possible, spanning several hours per night. The only requirements are
the weather and your patience! If you need more help on the observing
technique, please feel free to ask on the vsnet-campaign list.

   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 administrator)

with a line "SUBSCRIBE vsnet-campaign."
(VSNET campaign members are strongly recommended to subscribe to vsnet-alert
at the same time).

Taichi Kato
On behalf of the VSNET administrator team


The following was issued on February 4, 2002, as VSNET campaign circulation 1284
[Note a large part of detailed information is posted to vsnet-campaign

VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  SN 2002ap (RA = 01h36m23s.85, Dec = +15d45'13".0)

    On January 24, an apparently very bright supernova in M74 was
  discovered by Y. Hirose at 14.5mag and the object was rising to
  13.7mag on January 30. If this new object is of type Ia, it can
  become mag 11, the brightest SN since SN 1993J in M81.
  The position of the object is about 258" west and 108" south of
  the face-on spiral galaxy M74 = NGC 628 (vsnet-campaign-sn 328,
  vsnet-campaign-sn2002ap 1, 2, 3, 4, 5, 7, 8). H. Yamaoka reported
  that spectra taken by Bisei, Gunma, ESO, and Wise Obs. team show
  features similar to type Ib/c, or hypernova (vsnet-campaign-sn2002ap
  11, 12, 13, 14, 15, 20, 32, 33, 46, 50, vsnet-campaign-sn 332,
  333, 335). J. Deng reported that the expansion velocity of the
  ejected matter is quite fast and such large energy supports its
  hypernova nature (vsnet-campaign-sn2002ap 23). The VLA observations
  detected its radio counterpart of 375+/-30 microJy at 8.46 GHz.
  As well as GRB 980425 with SN 1998bw, it is suspected that this
  supernova might be associated with a gamma-ray burst
  (vsnet-campaign-sn2002ap 16, 17). S. Smartt reported on images
  around M74 taken before SN 2002ap appeared and suggested an
  initial mass of the progenitor around 40 solar mass if the object
  they detected is a single star (vsnet-campaign-sn2002ap 56).
    The rising rate seems to be rather slower with time while
  the brightening is still ongoing. The prompt reports by a number
  of observers have successfully record the brightening phase.
  It was now at about 12.7mag (visual).
  (vsnet-campaign-sn2002ap 18, 19, 21, 22, 24, 26, 27, 28, 29, 34,
  36, 37, 39, 40, 41, 44, 45, 47, 48, 49, 51, 52, 53, 54, 55, 57,
  58, 59, 60, 61, 62, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74).

  QZ Ser (RA = 15h56m55s.02, Dec = +21d07'12".1)

    P. Schmeer found a rare, bright outburst (11.9mag) of QZ Her
  on February 4. His observation also shows it was still faint
  on February 3 (vsnet-campaign-dn 2088, vsnet-campaign 1281,
  1283, vsnet-campaign-news 130). It is suspected that
  the object is a WZ Sge-like rare object which experience an
  outburst once in a few years (vsnet-campaign 1282).

(continuous targets)
  V2540 Oph (RA = 17h37m34s.36 Dec = -16d23'18".4)
=Nova Oph 2002

    This nova has been given the permanent GCVS designation of
  V2540 Oph according to IAUC 7810 (vsnet-campaign-nova 801).
  The nova is still bright and a number of observations including
  visual and CCD observations has been reported to VSNET
  (vsnet-campaign-nova 795). The fading rate was reported to be
  relatively slow in the end of Janaury (vsnet-campaign-nova 799),
  and then, a brightening was detected on January 30
  (vsnet-campaign-nova 802, 808). It then remained at about 8.6mag
  until February 1 (vsnet-campaign-nova 813, 817), and then again
  started gradual fading. It was now at about 9.0mag
  (vsnet-campaign-nova 818, 819).

  SN 2002ao (RA = 14h29m35s.74, Dec = -00d00'55".8)

    IAUC 7810 informed that a spectrum of SN 2002ao shows a blue
  continuum with broad features, which cannot be identified with
  Si, He, or H. They quoted the resemblance with type IIb SN 1996cb
  around maximum (vsnet-campaign-sn 334). The object was brightening
  and reported to be 13.6mag on January 29 (vsnet-campaign-sn 336).
  H. Yamaoka et al. performed spectroscopy and revealed that it is
  of type Ic (vsnet-campaign-sn 339).

  SN 2002an (RA = 08h22m47s.76, Dec = +24d17'41".7)

    The object was brightening and reported to be 15.5CR on
  January 25 by O. Trondal (vsnet-campaign-sn 337).

  SX LMi (RA = 10h54m29s.93, Dec = +30d06'30".0)

    After temporal short plateau without any fading around January 30
  (vsnet-campaign-dn 2080), the object again started gradual fading
  (vsnet-campaign-dn 2081, 2082). Superhumps decreased in amplitude
  with time (vsnet-campaign-dn 2087).

  AT Cnc (RA = 08h28m36s.92, Dec = +25d20'02".6)

    The standstill continues (vsnet-campaign-dn 2086).

  V838 Mon (RA = 07h04m04s.816, Dec = -03d50'50".94)
= GSC 4822.39

    According to IAUC 7812, the possible nova or peculiar variable
  in Mon (GSC 4822.39) has been given the above permanent GCVS
  designation of V838 Mon (vsnet-campaign-nova 811,
  vsnet-campaign-unknown 62).
    The slow fading was reported (vsnet-campaign-nova 803, 814
  vsnet-campaign-unknown 61, 63) until February 2 when L. Brat
  found the object suddenly brightened from 11 mag to 8.8mag
  (vsnet-campaign-v838mon 3, 31). The rapid brightening was
  promptly confirmed by a number of visual and CCD observers
  (vsnet-campaign-v838mon 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
  17, 18, 19, 20, 21, 22, 23, 24). The rising rate became more
  gradual in the late January 3 when the object was V~7.5mag
  (vsnet-campaign-v838mon 26, 27, 28, 30, 33, 37, 38, 39, 40, 41,
  42, 44, 45, 47, 48, 49, 50, 51). K. Ayani performed spectroscopy
  at Bisei Astronomical Observatory and reported the strong H-alpha
  emission with FWHM of 220 km/s. It has a broad wing with FWZI of
  about 3000 km/s, and a P-Cyg absorption with a blueshift of about
  230 km/s relative to the emission peak (vsnet-campaign-v838mon 25).
  M. Fujii also performed spectroscopy and reported that there seems
  to be likely Fe II emission line series, accompanied with a P Cyg
  profile. The P Cyg profile was getting stronger with time
  (vsnet-campaign-v838mon 36). A. Henden compared its colors with
  those before the current eruption and reported that VRI colors
  are pretty consistent with earlier in the outburst, but the U and
  B colors have changed dramatically (vsnet-campaign-v838mon 52).
     The slow brightening is still ongoing, but to date no one can
  answer a question "What happen?"

  IM Nor (RA = 15h39m26s.47, Dec = -52d19'18".2)

    The slow fading continues. It is currently about 9.3-9.4mag
  (vsnet-campaign-nova 804, 807, 809, 810, 812, 816, 820).
  The X-ray observation with Chandra is planed on February 4 18:01
  (vsnet-campaign-nova 815).

  UX Ori (RA = 05h04m30s.39, Dec = -03d47'18".3)

    As reported by E. Muyllaert on February 2, the object is now
  very faint at 11.2mag (vsnet-campaign-orion 11).

  HV Vir (RA = 13h21m03s.0, Dec = +01d53'28")

    The object has remained at the faint state. Late superhumps
  are still seen (vsnet-campaign-hvvir 80). Possible further
  fading was reported on January 31 (vsnet-campaign-hvvir 81).

  HL CMa (RA = 06h45m17s.0, Dec = -16d51'35")

    The object faded from the unusual outburst (vsnet-campaign-dn 2085).

  delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")

    The object is still in very bright state (vsnet-campaign-be 159).
  A possible brightening was reported on January 2 (vsnet-campaign-be 162).

  V803 Cen (RA = 13h23m44s.5, Dec = -41d44'30".1)

    The object was fading from the outburst maximum
  (vsnet-campaign-dn 2089).

  V1039 Cen (RA = 13h55m41s.27, De = -64d15'57".9)

    The object is gradually fading without large oscillations
  (vsnet-campaign-nova 797, 805).

  kappa CMa (RA = 06h49m50s.45, Dec = -32d30'30".2)

    S. Otero reported that kappa CMa experienced an eruption of
  V=3.5mag. And he further commented that its variability range
  in the GCVS has been out of business for years now (V= 3.78 - 3.96),
  and recently the star has been at 3.7 - 3.8 when at minimum,
  meaning that the mean magnitude has been changing
  (vsnet-campaign-be 160, 161).

  eta Car (RA = 10h45m03s.65, Dec = -59d41'03".7)

    A H. Williams' observation shows it was V=5.154 on JD 2452302.88
  (vsnet-campaign-sdor 10). No major brightening was detected
  in visual observations (vsnet-campaign-sdor 11).

*** Future schedule ***

Main Scientific Organizer (MSO):
Elena Pian - INAF, Astronomical Observatory of Trieste, Italy -
[vsnet-campaign-grb 1]

Sendai, Japan: May 13-16, 2002
contact to: Dr. M. Seki or
[vsnet-campaign-mira 3]

  International Conference on Classical Nova Explosions
Sitges (Barcelona), Spain: 20-24 May 2002
    For more detailed information, see
[vsnet-campaign-nova 643]
[vsnet-campaign-nova 666]

  Blazar meeting at Tuorla: June 17-21, 2002
for more information, see
[vsnet-campaign-blazar 232]

  International workshop
"XEUS - studying the evolution of the hot universe"
March 11-13, 2002 ; MPE Garching, Germany
for more information, see
[vsnet-campaign-xray 98]
[vsnet-campaign-xray 104]

  Campaign on YY Eri
2002 February 9 and 10
conducted by Japan Variable Star Study Association
[vsnet-campaign-ecl 38]

*** General information ***

  SN 2002ap
    VSNET page for SN 2002ap:
[vsnet-campaign-sn2002ap 25]
    Article on "Hypernova", see [vsnet-campaign-sn2002ap 35]
    Web page on supernovae and star formation presented by I. Wilson:
[vsnet-campaign-sn 338]
    Information about the host galaxy, see [vsnet-campaign-sn 329]
    Image showing a brightening taken by Y. Sano:
[vsnet-campaign-sn 330]
    New list: [vsnet-campaign-sn2002ap], see [vsnet-campaign-sn 331]
or [vsnet-campaign-sn2002ap 69]
    Chart provided by R. Bouma and E. van Dijk:
[vsnet-campaign-sn2002ap 9]
    Chart provided by A. Henden:
[vsnet-campaign-sn2002ap 9]
    Web page provided by D. W. Bishop:
[vsnet-campaign-sn2002ap 10]
    Spectrum taken by Gunma Astronomical Observatory:
[vsnet-campaign-sn2002ap 11]
    Spectrum taken by Bisei Astronomical Observatory:
[vsnet-campaign-sn2002ap 11]
    Image taken by A. Miyashita:
[vsnet-campaign-sn2002ap 30,31]
    Images taken by G. P. Szokoly:
[vsnet-campaign-sn2002ap 38]
    Images taken by Z. Vicar and P. Mihor:
[vsnet-campaign-sn2002ap 42]
    Sequence presented by A. Henden:
[vsnet-campaign-sn2002ap 43]
    Pre-SN2002ap image provided by S. Smartt et al.:
[vsnet-campaign-sn2002ap 56]

  V838 Mon
    New list: [vsnet-campaign-v838mon], see [vsnet-campaign-v838mon 1],
[vsnet-campaign-news 129] or [vsnet-campaign-v838mon 35]
    Time-series photometry provided by L. Kral, see [vsnet-campaign-data 87]
    Spectrum taken by M. Gavin:
[vsnet-campaign-v838mon 29]
    Chart presented by A. Price and C. Scovil:
[vsnet-campaign-v838mon 43]
    Sequence presented by B. H. Granslo, see [vsnet-campaign-v838mon 46]

  Nova Oph 2002
    Images taken in the early phase by T. Seki:
[vsnet-campaign-nova 793]
    Spectra taken by K. Ayani, Bisei Astronomical Observatory:
[vsnet-campaign-nova 794]
    Images taken by S. Kiyota:
[vsnet-campaign-nova 796]
    Spectrum taken by S. Kiyota:
[vsnet-campaign-nova 798]
    Discovery story reported by K. Haseda, see [vsnet-campaign-nova 800]
    Sequence provided by B. G. Granslo, see [vsnet-campaign-nova 806]

  ROTSE3 J015118.59-022300.1
    Sequence provided by M. Simonse:
[vsnet-campaign-dn 2083]

  KN Gem
    General information about its identification commented by M. Simonsen,
see [vsnet-campaign-dn 2084]

(This summary can be cited.)

Makoto Uemura
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