(cba:news) DN outburst in Taurus
jop at astro.columbia.edu
Sun Aug 10 09:48:03 EDT 2008
Not the best sky position... but plenty worth following - DN of very
short period are potentially very sinificant targets!
-------- Original Message --------
Subject: CBET 1463: 20080809 : CATACLYSMIC VARIABLE STAR IN TAURUS
Date: Sat, 9 Aug 2008 10:42:35 -0400 (EDT)
From: IAUC mailing list <quai at cfa.harvard.edu>
To: iauc at libraries.cul.columbia.edu
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS at CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT at CFA.HARVARD.EDU (science)
CATACLYSMIC VARIABLE STAR IN TAURUS
H. Yamaoka, Kyushu University, reports the discovery by K. Itagaki
(Yamagata, Japan) of a variable star (mag 14.1) on an unfiltered (red)
survey CCD image taken with a 0.21-m f/3 reflector (with confirming images
taken with a 0.60-m f/5.7 reflector) around Aug. 7.7 UT. The variable is
located at R.A. = 4h06m59s.78, Decl.= +0d52'44".3 (equinox 2000.0), and it
was fainter than mag 17.0 on Itagaki's survey image taken on 2007 Oct. 13.
H. Kaneda (Sapporo, Japan) notes that an x-ray source (1RXS
is located within 7" of the reported position, and the variable should be
identical with a USNO-B1.0 catalogued star (B1 mag 18.4, R1 mag 17.5)
whose position end figures are 59s.82, 44".3. Yamaoka adds that the NOMAD
catalogue shows that the variable was caught in a bright state in the YB6
catalogue (USNO, unpublished, epoch unknown) at B = 14.3 and V = 14.35.
Following posting on the CBAT's unconfirmed-objects webpage, C. Jacques and
E. Pimentel (Belo Horizonte, Brazil) write that they obtained a 60-s
unfiltered CCD image on Aug. 9.46 remotely using a 0.25-m f/3.4 reflector
near Mayhill, NM, U.S.A., finding position end figures 59s.82, 44".0 and
mag 13.7. Yamaoka adds that H. Maehara (Kyoto University) has found that
the variable was detected via ASAS at V = 13.5 on Aug. 4.42 but was fainter
than the detection limit on July 25.41, with other outbursts (V = 13.5-14)
occurring on 2004 Oct. 20 and 2006 Mar. 16. Maehara adds that photometry
by G. Bolt on Aug. 8 show the variable to display clear superhumps with an
amplitude of 0.2 mag and period around 0.06 day, which indicate that the
object is an SU UMa-type dwarf nova.
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2008 CBAT
2008 August 9 (CBET 1463) Daniel W. E. Green
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