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IAUC 7155: V4444 Sgr = N Sgr 1999; V4334 Sgr

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                                                  Circular No. 7155
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)


V4444 SAGITTARII = NOVA SAGITTARII 1999
     N. N. Samus, Sternberg Astronomical Institute, Moscow, on
behalf of IAU Commission 27, informs us that this object (cf. IAUC
7153, 7154) has been given the designation V4444 Sgr.  This new
policy of rapidly assigning permanent designations for occasional
unusual Milky Way variable stars that are announced on these
Circulars was instituted following discussions with the Central
Bureau.
     W. Liller, Vina del Mar, Chile, reports that another
objective-prism spectrogram (cf. IAUC 7153) secured on Apr. 29.208
UT shows the H-alpha emission much brighter than on Apr. 27 (it is
now 2.1 times brighter than the neighboring continuum), and H-beta
emission has become visible.  Additional broadband V CCD magnitudes:
Apr. 28.152 UT, 8.09; 29.219, 8.719.
     CCD photometry by D. Hanzl, Brno, Czech Republic (0.40-m
reflector; comparison star GSC 6850.1335, V = 8.59, B-V = -0.018):
Apr. 30.108 UT, V = 9.04 +/- 0.03, B-V = +0.07 +/- 0.03.
     Visual magnitude estimates:  Apr. 27.457 UT, 7.7 (A. Jones,
Nelson, New Zealand); 27.699, 7.7 (Jones); 27.751, 7.7 (Jones);
28.073, 8.5 (P. Schmeer, Bischmisheim, Germany); 28.331, 8.2 (J. G.
de S. Aguiar, Campinas, Brazil); 29.097, 9.0 (K. Hornoch,
Lelekovice, Czech Republic); 29.105, 8.8 (Schmeer); 29.636, 9.0 (A.
Pearce, Nedlands, W. Australia).


V4334 SAGITTARII
     G. Jacoby, Kitt Peak National Observatory (KPNO), reports:
"The unusual variable star V4334 Sgr (cf. IAUC 6322) has continued
to fade and become redder (cf. IAUC 7095).  Photometric measures
obtained by R. Ciardullo and J. Feldmeier, Pennsylvania State
University, at the KPNO 4-m telescope in B and V on Mar. 21.51 UT
and in R and I on Mar. 22.52 yield:  V = 20.08, B-V = +3.17, V-R =
+2.75, and V-I = +4.99.  Observations by K. Hinkle and R. Joyce at
the KPNO 2.1-m telescope on Apr. 8.42 at 1083 and 2230 nm yield
V-m(1083) = +8.3 and V-m(2230) = +13.5, assuming that V4334 Sgr had
not faded further between Mar. 21 and Apr. 8.  All photometry has
an accuracy of < 0.2 mag.  If the infrared emission is from a
blackbody, then the m(1083-nm)-m(2230-nm) color suggests that its
temperature is about 1285 K.  The observed optical fluxes, however,
are not reproduced accurately by the prediction of a pure 1285-K
blackbody, being brighter at B, V, and R relative to the prediction.
Emission in the region near 1083 nm appeared to be continuous."

                      (C) Copyright 1999 CBAT
1999 April 30                  (7155)            Daniel W. E. Green

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