Central Bureau for Astronomical Telegrams
IAUC 7192: V382 Vel; C/1999 H1
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Circular No. 7192
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)
V382 VELORUM
S. N. Shore, Indiana University, South Bend; H. E. Bond and R.
Downes, Space Telescope Science Institute; S. Starrfield, Arizona
State University; R. D. Gehrz, University of Minnesota; J.
Krautter, Landessternwarte Heidelberg; and C. E. Woodward,
University of Wyoming, write: "We observed V382 Vel with the Hubble
Space Telescope's Imaging Spectrograph (STIS) on May 31.3 UT, using
the medium-resolution echelle gratings (E140M and E230M). Three
exposures were taken, centered at 142.5, 197.8, and 270.7 nm with
resolutions of about 45~000 (E140M) and 30~000 (E230M). Mg II h
and k emission was detected with FWZI = 4000 km/s, a maximum
blueshift of -2000 km/s, and an integrated line flux of 8.2 x
10**-9 erg cm**-2 s**-1 (no reddening correction); the line profile
shows neither P-Cyg absorption nor fine structure but is steeper on
the blueward emission side. The only other obvious features are
the iron-peak absorption bands that dominate the short-wavelength
(< 200 nm) spectrum, and the Al II and Fe-peak blend in emission at
265 nm. The width of the Mg II line, which is nearly optically
thin, and the resemblence to the spectrum of V1974 Cyg at a similar
stage of the outburst, support the suggestion (IAUC 7185) that this
is an ONeMg-type nova. The interstellar Mg II lines show a broad,
completely optically thick component with mean radial velocity
+24.2 km/s and an optically thin narrower component at +48.5 km/s
(the Mg II 279.6-nm/280.3-nm line ratio for the latter component is
about 2.4). The integrated flux from 120.0 to 320.0 nm is 9.6 x
10**-8 erg cm**-1 s**-1, or 3.7 x 10**-7 if corrected for reddening
of E(B-V) = 0.2. The reddening is probably low, as there is no
evidence for the 217.5-nm interstellar feature. An additional STIS
observation will be made on June 21.6. Continued spectroscopy at
all wavelengths is urged."
COMET C/1999 H1 (LEE)
Total visual magnitude estimates: May 17.07 UT, 6.5 (J. E.
Bortle, Stormville, NY, 10x50 binoculars); 31.33, 6.6 (D. A. J.
Seargent, The Entrance, N.S.W., 10x50 binoculars); June 2.31, 6.9
(S. T. Rae, Palmerston North, New Zealand, 10x50 binoculars); 4.85,
6.4 (R. Haver, Frasso Sabino, Rieti, Italy, 15x80 binoculars);
7.44, 6.4 (A. Pearce, Nedlands, W. Australia, 20x80 binoculars).
(C) Copyright 1999 CBAT
1999 June 7 (7192) Daniel W. E. Green
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