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IAUC 3567: U Ori; ARAKELIAN 120; LANNING 10

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IAUC number 

                                                  Circular No. 3567
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


U ORIONIS
     K. Mattila and M. Toriseva, University of Helsinki Observatory,
telex: "Observations made with the 13.7-m radio telescope of the
Metsaehovi Radio Research Station show that the 2.22-GHZ H2O line
emission of the Mira-type variable U Ori has undergone a remarkable
brightening since its last known observation in 1978 May (cf.
Spencer et al. 1979, Ap.J. 230, 449).  Since its discovery in 1970
(cf. Wilson et al. 1972, Ap.J. 177, 523), the observed peak flux
densities of the H2O line have been < 80 Jy.  On 1981 Jan. 12 at 1h
UT, we observed a peak antenna temperature of 40 K for U Ori,
corresponding to 1200 Jy.  The lsr radial velocity of the single
spectral feature is -37 km/s and its width is 0.7 km/s.  The OH maser
emission of U Ori underwent a remarkable outburst and change in
maser class during 1973-74 (cf. Cimerman 1979, Ap.J. 228, 179), and
this phenomenon appears to be correlated to a preceding anomalous
optical brightening (cf. Garrigue and Mennessier 1980, A. & Ap. 81,
L13).  We therefore propose that radio observations of OH and SiO
maser emission, and optical and infrared observations, of U Ori be
made during the next few months."


ARAKELIAN 120
     C. B. Foltz and B. M. Peterson, Department of Astronomy, Ohio
State University, write: "We have found a dramatic change of the H-alpha
and H-beta profiles in the spectrum of the Seyfert 1 galaxy Akn 120.
Comparison of data obtained with the Ohio State image-dissector
scanner on Jan. 11 with data obtained at Lick Observatory in 1976
(cf. Osterbrock and Phillips 1977, P.A.S.P. 89, 251) shows a
significant increase in an emission component longward of each of the
lines' centers."


LANNING 10
     H. Lanning, Mount Wilson Observatory; and K. Home and R.
Gomer, California Institute of Technology, report: "Following a
suggestion by B. Margon that Lanning 10 (R.A. =5h30m17s, Decl. = +36o57'59",
equinox 1950.0) is a cataclysmic variable, we have obtained coude
spectroscopy and high-speed photometry at Mount Wilson during 1980
which show that the object is an eclipsing binary with period
0d.3212534 +/- 0d.0000017, HJD = 2444557.94957 +/- 0.00015 and Kwd = 200
+/- 20 km/s."


1981 January 26                (3567)              Daniel W. E. Green

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