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IAUC 3778: Prob. N IN Ser; Var STAR IN Ori; SU UMa

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IAUC number 

                                                  Circular No. 3778
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758


PROBABLE NOVA IN SERPENS
     H. Kosai, Tokyo Astronomical Observatory, telexes the following
additional magnitude estimates (Tri-X film, green filter) by
M. Wakuda, Hamamatsu, Shizuoka: Feb. 24.83 UT, 9.5 (correction to
IAUC 3777); 25.8, 10; 27.8, 10.5.  After the announcement, the
object was also found on exposures by M. Honda, Kurashiki, who
gives the magnitude (Tri-X) as: Feb. 21.8, [13; 22.8, 8.  Kosai
has measured the following accurate position from Wakuda's Feb. 22
exposure: R.A. = 17h53m12s8, Decl. = -14deg00'48" (equinox 1950.0).


VARIABLE STAR IN ORION
     G. H. Herbig, Lick Observatory, writes: "The slowly-brightening
variable star near the Orion Nebula found by Sugano (IAUC
3763) has been observed spectroscopically by E. A. Harlan on Feb.
1 and 4 (Crossley reflector, dispersion 350 A/mm) and by R. P.
Kraft on Feb. 20 (3-m Cassegrain scanner, 0.8-nm resolution).  The
spectrum shortward of 530 nm is dominated by very strong emission
lines (Ca II, H, Fe II, fluorescent Fe I, etc.) typical of T-Tau
stars.  No absorption spectrum is visible, nor is any structure
apparent at these resolutions in the H and Ca II lines.  The
spectrum thus does not resemble those of FU-Ori-like variables near
maximum light, but rather is of the type observed near peak
brightness in DR Tau and VY Tau.  Direct plates obtained by Harlan
on Jan. 31 gave V ~ 14.1, B-V ~ +0.8.  It is recommended that
Sugano's star continue to receive the attention of observers, at
least until the current outburst is over."

     Visual magnitude estimate by K. Locher, Grut, Switzerland:
Feb. 4.80 UT, 14.3.


SU URSAE MAJORIS
     J. Mattei, AAVSO, reports that this variable, prototype of
its class, is undergoing a superoutburst.  Visual magnitude
estimates are: Feb. 21.1 UT, 14.2 (E. Mayer, Barberton, OH); 22.2,
14.1 (J. Griese, Stamford, CT); 24.2, 11.9 (M. Heifner, Denver,
CO): 26.1, 11.2 (Mayer); 28.1, 11.1 (P. Sventek, Houston, TX).
The last superoutburst was observed in mid-March 1980 (IAUC 3462).
Search for superhumps with high-speed photometry is recommended.


1983 March 1                   (3778)              Brian G. Marsden

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