Sziasztok!
Az AAVSO Special Notice hívjafel a figyelmet, hogy ismét kitört az
1903-as év nóvája, az X Ser. A mostani kitöréts Robert Modic fedezte fel
az AAVSOnet K35-ös távcsövével készült CCD felvételen. Hasonlóan a GK
Per kis kitöréseihez, itt is törpenóva-szerű kitörésről lehet szó.
Az X Ser 1903-mas nóvakitörése során 8,9 magnitúdót ért el.
A legutóbbi - elsőként észlelt - törpenóva-szerű kitörése során
2009-ben 14,2 magnitúdóig fényesedett. A mostani kitörés során eddig
14,8 magni fényességet ért el, de lehet, hogy még tovább fog fényesedni.
Jó észlelést!
Fid
----- Forwarded message from aavso@aavso.org -----
Date: Thu, 31 May 2012 19:47:04 -0400
From: aavso@aavso.org
Subject: AAVSO Special Notice #285: Outburst of old nova X Ser
AAVSO Special Notice #285
Outburst of old nova X Ser
May 31, 2012
As announced by Robert Modic (Richmond Heights, OH) 2012 May 30
in the aavso-photometry discussion group
(http://www.aavso.org/pipermail/aavso-photometry/) and
subsequently reported in vsnet-alert 14629, the old slow nova
X Ser (Nova Ser 1903) is in outburst. This outburst is likely a
dwarf nova-like outburst, similar to the one seen in 2009, which
was the first reported since the nova outburst in 1903.
Modic discovered X Ser in outburst on images taken 2012 May 30
with the AAVSOnet K35 telescope (Krajci 35cm, Astrokolkhoz
Observatory, NM).
The outburst was confirmed by Roger Pickard (Leominster,
England), who reported in a 2012 May 31 posting to the
aavso-photometry discussion group an observation made in
"appalling conditions" with the Faulkes Telescope South
at magnitude ~14.87 V on 2012 May 31.5983 UT.
As noted by Modic, observations from 2012 May 18, 20, and 26
in the AAVSO International Database by Shawn Dvorak (Clermont,
FL) show X Ser rising to maximum.
Nova Serpentis, which reached a maximum of photographic
magnitude 8.9 in May 1903, was actually discovered by
Henrietta Leavitt in 1908 on a Harvard College Observatory
plate and was announced by her as HV 3137.
The previous dwarf nova-like outburst was discovered 2009 August
18 by Etienne Morelle (Lauwin-Plancque, France) with X Ser at
magnitude 14.83 (filter unknown); it brightened to visual
magnitude 14.2, and was brighter than magnitude 16.4 until 2009
September 10. X Ser is <17.0 at minimum. As seen in GK Per (Nova
Per 1901), these dwarf nova-like outbursts signal the
reconstruction of the accretion disk which was destroyed in the
nova explosion.
Observations reported to the AAVSO include:
2012 May 03.3828 UT, <16.4 V +/-0.4 (S. Dvorak, Clermont, FL);
18.2125, 16.1 V +/-0.1 (Dvorak);
20.1936, 15.77 V +/-0.08 (Dvorak);
26.3580, 15.28 V +/-0.07 (Dvorak);
30.2232, 15.075 B +/-0.025 (R. Modic, Richmond Heights, OH,
remotely with AAVSOnet K35 telescope);
30.2265, 14.806 V +/-0.029 (Modic, AAVSOnet K35);
31.5983, 14.87 V (R. Pickard, Leominster, England, remotely with
Faulkes Telescope South);
Visual, CCD, and spectroscopic observations are encouraged
throughout the outburst.
Coordinates: 16 19 17.68 -02 29 29.6 (2000.0)
Charts for X Ser may be created using the AAVSO Variable Star
Plotter (http://www.aavso.org/vsp).
Observations should be reported to the AAVSO International
Database as X SER.
This AAVSO Special Notice was compiled by Elizabeth O. Waagen.
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----- End forwarded message -----