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IAUC 7494: 2000dl; 2000dk; XTE J1859+226

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IAUC number

                                                  Circular No. 7494
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
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SUPERNOVA 2000dl IN UGC 1191
     M. M. M. Santangelo, Lucca, Italy, reports his discovery of an
apparent supernova (R about 18) on five unfiltered CCD frames taken
on Sept. 11.05 UT with a 0.51-m reflector in the course of the Monte
Agliale Supernovae Search.  SN 2000dl was confirmed on nine frames
(limiting mag R about 19.5) taken on Sept. 17.89 and 19.90.  The
new object is located at R.A. = 1h42m05s.77, Decl. = +7 39'58".2
(equinox 2000.0), which is about 4" west and 5" north of the
nucleus of UGC 1191 = MCG +1-5-23 (the northern elliptical galaxy
of an interacting pair of galaxies, both of which are near the
center of the cluster Abell 240).  Nothing appears at this location
on the O and E prints of the first Palomar Sky Survey or on various
other deep photographic and CCD images of this galaxy.
     S. Jha, P. Challis, T. Matheson, and R. Kirshner,
Harvard-Smithsonian Center for Astrophysics, report that spectra of
SN 2000dl, obtained by P. Berlind on Sept. 21.5 UT with the Whipple
Observatory 1.5-m telescope (+ FAST spectrograph), show it to be a
type-Ia supernova, 2-3 weeks after maximum light.  Cross-correlation
of the host-galaxy spectrum with an absorption-line template yields
a recession velocity of 18 260 +/- 30 km/s.

     Jha et al. also report that a spectrum of SN 2000dk (cf. IAUC
7493), obtained as above on Sept. 20.39 UT, shows it to be a type-Ia
supernova at maximum light.  The spectrum exhibits a blue continuum,
with well-defined Si II, S II, Fe II, Mg II, and Ca II features.
Given the NASA/IPAC Extragalactic Database recession velocity of
5228 km/s for the host galaxy, the supernova expansion velocities
are 11 500 km/s and 15 500 km/s for Si II (rest 635.5 nm) and Ca II
(H and K), respectively.  The spectral-feature age of the supernova
(Riess et al. 1997, A.J. 114, 722) is 2 +/- 3 days before maximum

XTE J1859+226
     P. Zhao, M. Garcia, and J. McClintock, Smithsonian
Astrophysical Observatory, report:  "This x-ray nova has declined
considerably since July (IAUC 7451, 7463, 7466).  The object was
not detected in observations made by B. Patten with the F. L.
Whipple Observatory's 1.2-m telescope on Sept. 16-19 UT.  The
observing conditions were good, and the total exposure times were
30 min for the V band and 45 min for the R band.  The magnitude
limits are V > 24 and R > 23."

                      (C) Copyright 2000 CBAT
2000 September 22              (7494)            Daniel W. E. Green

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