Central Bureau for Astronomical Telegrams
IAUC 7834: V838 Mon; 2002ap; 2002aw
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Circular No. 7834
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
V838 MONOCEROTIS
K. Hinkle, R. Joyce, and L. Wallace, National Optical
Astronomy Observatory; and B. Rodgers, Gemini Observatory, report
high-resolution (R = 50 000) infrared spectroscopy of the
2.3-micron region of V838 Mon, obtained with the Phoenix
spectrograph on the Gemini South telescope on Feb. 13.1 UT: "CO
appears to have weakened dramatically from previous reports (IAUC
7796 and 7829), with absorption central depths of at most 4 percent
for individual 2-0 R-branch lines. The 3-1 band head is not
prominent. The CO lines are broad with FWMH = 50 km/s at a
heliocentic radial velocity of -10 km/s. The CO excitation
temperature is that of a stellar photosphere. A few atomic lines
are present in absorption in the region observed. Na I lines at
2336 and 2338 nm have a velocity of +190 km/s, confirming the
presence of multiple-velocity systems in V838 Mon (IAUC 7786, 7812,
7822, 7829). Using Phoenix in imaging mode, the [2320 nm]
magnitude was determined to be +4.1. This implies significant
brightening in the infrared from mid-January (IAUC 7791 and 7796)."
SUPERNOVA 2002ap IN M74
K. Motohara and K. Nomoto, University of Tokyo; C. Gerardy and
R. Fesen, Dartmouth College; and P. Henry, University of Hawaii,
report on near-infrared imaging and spectroscopy of SN 2002ap with
the 8.3-m Subaru telescope (+ CISCO) on Feb. 7.21-7.26 UT. The
spectrum (range 0.88-2.5 microns, resolution 220-440) shows a
strong P-Cyg emission feature with a broad absorption minimum near
1.03 microns, along with weaker features with minima near 0.96,
1.51, and 2.01 microns. If the strong 1.03-micron feature is
attributed to He I (1.083 microns), then the observed blueshift
implies a photospheric expansion velocity of roughly 16 000 km/s.
Mg II 1.093-microns and C I 1.069-microns could also be
contributing to this feature. Estimated infrared magnitudes: Feb.
7.214, J = 11.97 +/- 0.05; 7.217, H = 11.77 +/- 0.05; 7.219, K =
11.68 +/- 0.05.
SUPERNOVA 2002aw IN ANONYMOUS GALAXY
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2002aw (cf. IAUC 7831), obtained by M. Calkins on
Feb. 18.52 UT with the Mt. Hopkins 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-Ia supernova near maximum.
The spectral-feature age (cf. IAUC 7774) of the supernova is 1 +/-
2 days before maximum light.
(C) Copyright 2002 CBAT
2002 February 22 (7834) Daniel W. E. Green
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