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IAUC 7259: V723 Cas; V4633 Sgr = N Sgr 1998; C/1999 N2

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                                                  Circular No. 7259
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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Phone 617-495-7244/7440/7444 (for emergency use only)


V723 CASSIOPEIAE
     R. J. Rudy, D. K. Lynch, and S. Mazuk, The Aerospace
Corporation; R. C. Puetter, Center for Astrophysics and Space
Science, University of California at San Diego; and C. E. Woodward,
University of Wyoming, report 0.8-2.5-micron spectrophotometry of
V723 Cas = N Cas 1995 using the Shane 3-m telescope at Lick
Observatory and the Aerospace Near Infrared Imaging Spectrograph
(NIRIS) on Aug. 29.5 UT.  Four years after outburst, V723 Cas
remains bright and displays a remarkable high-excitation spectrum.
The coronal line [Si VI] 1.9629-microns is the second strongest
feature in the spectrum (after He I 1.0830-microns).  Two other
coronal features, [Ca VIII] 2.3202-microns and [Si VII] 2.4827-
microns, are also prominent.  The hydrogen Paschen and Brackett
series, and very strong lines of He II, are present, as are lines
of [S II] and [S III].  The presence of [Si VII] 2.4827-microns
requires ionizing photons with energies in excess of 205 eV.  J, H,
and K magnitudes determined from the spectrum are 11.9, 12.0, 11.2,
respectively.


V4633 SAGITTARII = NOVA SAGITTARII 1998
     Rudy et al. also report 0.8-2.5-micron spectrophotometry of
V4633 Sgr = N Sgr 1998 (cf. IAUC 6847, 6848, etc.) using the Shane
3-m telescope (+ NIRIS) at Lick Observatory on Aug. 29.5 UT.  V4633
Sgr is in the early stages of its coronal phase.  [Si VI] 1.9629-
microns is strong and [Ca VIII] 2.3202-microns is detected.  He II
1.0124-microns is about 2.5 times as strong as Paschen-delta, about
half the value that it will obtain as the excitation increases.
Lines of [N I] and [S III] are weak but present, indicating some
regions with densities in the range 10**6 to 10**7 cm**-3.  J, H,
and K magnitudes determined from the spectrum are 13.3, 13.2, and
12.7, respectively.


COMET C/1999 N2 (LYNN)
     Ephemeris extension to IAUC 7241 (elements MPC 35554):

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Sept.19    13 14.77   +33 51.4   1.943   1.315   38.5   28.4   11.1
     29    13 25.00   +36 02.5   2.050   1.453   41.1   27.0   11.7
Oct.  9    13 35.64   +38 17.8   2.129   1.592   45.2   26.5   12.2
     19    13 46.83   +40 45.5   2.183   1.731   50.6   26.4   12.6
     29    13 58.65   +43 32.0   2.217   1.868   56.8   26.4   12.9
Nov.  8    14 11.20   +46 42.4   2.236   2.004   63.7   26.3   13.3
     18    14 24.58   +50 20.7   2.246   2.138   71.0   25.9   13.6

                      (C) Copyright 1999 CBAT
1999 September 20              (7259)            Daniel W. E. Green

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