Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7834: V838 Mon; 2002ap; 2002aw

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 7833  SEARCH Read IAUC 7835

View IAUC 7834 in .dvi or .ps format.
IAUC number

                                                  Circular No. 7834
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
Phone 617-495-7440/7244/7444 (for emergency use only)

     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)."

     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.

     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

Read IAUC 7833  SEARCH Read IAUC 7835

View IAUC 7834 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!