Central Bureau for Astronomical Telegrams
IAUC 7329: 1999gi; V335 Vul
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Circular No. 7329
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1999gi IN NGC 3184
S. Nakano, Sumoto, Japan, reports the discovery by Reiki
Kushida, Yatsugatake South Base Observatory, of a supernova (mag
14.5) on unfiltered CCD frames taken on Dec. 9.82 UT with a 0.40-m
reflector. Previous frames that she took between 1994 and 1999 May
6 show nothing at this location (limiting mag 18), and nothing
appears at the location of the new object on a Digital Sky Survey
image. Position measured by Y. Kushida for SN 1999gi: R.A. =
10h18m16s.66, Decl. = +41o26'28".2 (equinox 2000.0), which is 3".5
west and 60".5 north of the center of NGC 3184. W. Li, University
of California at Berkeley, reports that a KAIT image of NGC 3184
taken on Dec. 2.5 shows nothing at the position of SN 1999gi
(limiting mag 19.0).
S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1999gi, taken by A. Mahdavi and Jha with the F. L. Whipple
Observatory (FLWO) 1.5-m telescope (+ FAST spectrograph) on Dec.
10.42 UT, reveals it to be a type-II supernova at an early epoch.
The spectrum exhibits a blue continuum with a broad H-alpha P-Cyg
profile, as well as a hint of He I (rest 587.6 nm) absorption. The
photospheric expansion velocity, measured from narrow superimposed
H-alpha emission to the trough of the H-alpha profile, is 13 300
km/s. The spectrum also exhibits a P-Cyg profile with absorption
trough observed at 444.3 nm, and a slightly less broad absorption
feature observed at 394.0 nm. In addition, interstellar Na I D
with equivalent width = 0.096 nm is visible at the redshift of NGC
3184 (given by the NASA/IPAC Extragalactic Database as 532 km/s),
implying that the supernova is likely significantly extinguished by
dust in the host galaxy. Concurrent images of SN 1999gi, taken by
J. Munoz Lozano at the FLWO 1.2-m telescope (+ 4Shooter), yield
position end figures for the supernova of 16s.62, 28".6.
V335 VULPECULAE
U. Munari, T. Tomov, and D. Moro, Padova and Asiago
Astronomical Observatories; and A. Henden, U.S. Naval Observatory,
Flagstaff, write: "The carbon symbiotic star V335 Vul seems to be
undergoing a bright outburst. Photometry with the USNO 1.0-m in
Flagstaff: June 23.32 UT, V = 12.87, B-V = +5.01; Dec. 3.05, V =
11.31, B-V = +3.06. Echelle and Boller & Chivens spectroscopy
obtained with the Asiago 1.22- and 1.82-m telescopes indicate a
tenfold increase in the intensity of the emission lines, compared
to quiescent conditions (cf. IBVS 4668). The strongest emission
lines include H-alpha, H-beta, Na I D, and the near-infrared Ca II
triplet."
(C) Copyright 1999 CBAT
1999 December 10 (7329) Daniel W. E. Green
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