Central Bureau for Astronomical Telegrams
IAUC 7239: N SMC; 1999dg, 1999dh; 1999df, 1999di, 1999dj
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Circular No. 7239
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)
NOVA IN THE SMALL MAGELLANIC CLOUD
J.-F. Glicenstein (DAPNIA, Saclay), on behalf of the EROS2 collaboration,
reports the discovery of an apparent nova in the Small Magellanic Cloud. The
object, located at R.A. = 00h53m40s.0, Decl. = -72o12'32" (equinox 2000.0),
triggered the EROS2 microlensing alert system and peaked in brightness
sometime between consecutive observations on 1999 July 26.1 UT (fainter than
V about 20.6) and 28.1 UT (Rc = 13.6). The object had faded to Rc = 15.6 by
Aug. 13 UT. In the pre-outburst field, the closest stellar object (Rc = 20.2)
was some 5" distant from the location of the nova. Finding charts can be
retrieved from http://www-dapnia.cea.fr/Phys/Spp/Experiences/EROS/novae/
index.html.
SUPERNOVAE 1999dg AND 1999dh
A. V. Filippenko, University of California at Berkeley, reports that
M. R. Metzger and T. A. Small (Caltech) obtained CCD spectra (range 390-880
nm, resolution 1 nm) of SNe 1999dg and 1999dh (cf. IAUC 7229) on Aug. 9 UT
with the Keck-II 10-m telescope. Inspection of the uncalibrated data
reveals that SN 1999dg is of type Ia, within about a week past maximum
brightness. SN 1999dh is a normal type II SN, perhaps a month or two past
maximum, in agreement with the report of Salvo et al. (IAUC 7238).
SUPERNOVAE 1999df, 1999di AND 1999dj
A. V. Filippenko, T. Matheson, R. T. Chornock and A. L. Coil,
University of California at Berkeley, report that uncalibrated CCD spectra
(range 330-1000 nm) obtained on Aug. 17 UT with the Shane 3-m reflector at
Lick Observatory reveal that SN 1999df (cf. IAUC 7228) is of type II.
Broad H-alpha emission is easily visible in the noisy data. The approximate
redshift is 0.038, based on narrow emission lines in the host galaxy.
SN 1999di (cf. IAUC 7234) is of type Ib, probably within a few weeks
past maximum, with prominent He I absorption lines at a velocity of 8100
km/s. The identity of relatively strong absorption at rest wavelength
630 nm is uncertain; it might be C II 658 nm, Si II 635 nm, or possibly
even H-alpha 656 nm. If the absorption is due to H-alpha (at velocity
12 000 km/s), then the object would be of type IIb. The redshift is 0.016,
again from narrow lines in the host. SN 1999dj (cf. IAUC 7234) is of
type II, with well-developed P-Cyg profiles. The redshift is 0.015.
(C) Copyright 1999 CBAT
1999 August 17 (7239) Gareth V. Williams
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