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IAUC 6849: TU Crt; eta Car; 1998A

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                                                 Circular No. 6849
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
Phone 617-495-7244/7440/7444 (for emergency use only)


TU CRATERIS
     J. A. Mattei, AAVSO, reports the following visual magnitude
estimates, which show that this SU UMa-type cataclysmic variable
(Maza et al. 1992, PASP 104, 1060; Wenzel 1993, IBVS 3829; Hazen
1993, IBVS 3888) is in outburst: Mar. 22.47 UT, [15.0 (R. Stubbings,
Drouin, Vic., Australia); 23.75, [13.7 (B. Monard, Pretoria, South
Africa); 23.89, [13.0 (P. Schmeer, Bischmisheim, Germany); 24.449,
15.0 (Stubbings); 24.476, 14.5 (Stubbings); 24.502, 13.9
(Stubbings); 24.522, 13.6 (Stubbings); 24.595, 13.0 (Stubbings);
24.680, 12.8 (Stubbings); 24.781, 12.4 (Monard); 24.829, 12.4
(Monard); 24.908, 12.7 (Schmeer); 24.916, 12.4 (Monard).  This star
has been in the AAVSO observing program only since 1996, and there
has been no known outburst over the past several years.


eta CARINAE
     F. Jablonski, Instituto Nacional de Pesquisas Espaciais; A.
Damineli, Instituto Astronomico e Geofisico; and D. F. Lopes,
Observatorio Nacional, report:  "Spectra collected at the
Laboratorio Nacional de Astrofisica show that eta Car is emerging
from the spectroscopic event that started in 1997 Dec. (IAUC 6790).
After a strong fading, the emission lines remained in a low state
through December and January.  On Mar. 8, the [Fe II] 715.5-nm line
displayed the same intensity as in November.  The equivalent width
of He I 667.8-nm increased six times faster in February than in
January, and the narrow-line component reappeared.  The highest
excitation lines are still absent, but are expected to appear
again before June."


SUPERNOVA 1998A IN IC 2627
     S. Woodings, A. Williams, R. Martin, D. Blair, and R. Burman,
Perth Observatory, report:  "Preliminary instrumental photometric
analysis of images of SN 1998A (IAUC 6805, 6809, 6823) shows that
the supernova has increased in brightness by about 1.0 mag (R and I
bands) between Jan. 6.77 (discovery date) and Mar. 15.7 UT.  The
observed 1.0-mag increase over 68 days is comparable to that
observed in SN 1987A over the same period.  However, its absolute
magnitude (-16.7 +/- 0.7) is about 1 mag brighter than that of SN
1987A.  Spectroscopic observations would be particularly valuable
in the next month when (by analogy with SN 1987A) SN 1998A may
evolve very rapidly."

                      (C) Copyright 1998 CBAT
1998 March 25                  (6849)            Daniel W. E. Green

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