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IAUC 3176: HR 1099; 2A 1052+606 = SAO 015338?; 1978c

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                                                  Circular No. 3176
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758

HR 1099
     P. A. Feldman, Herzberg Institute of Astrophysics; P. C.
Gregory and A. R. Taylor, University of British Columbia; and E. R.
Seaquist, David Dunlap Observatory  report that HR 1099 was
observed for ~ 4 hr starting Feb. 20d23h.6 UT at 2.8 cm with the 46-m
telescope of the Algonquin Radio Observatory.  It showed sustained
radio emission at the ~ 0.50-Jy level, the peak observed flux
being 0.67 +/- 0.01 Jy on Feb. 21d03h.3.  On Feb. 19 the source had a
flux density of only 0.05 Jy.  There is evidence for short-term
(~ 1 hr) variability in the flare emission.  On Feb. 21d20h.1 UT
the flux density reached 0.96 +/- 0.01 Jy, the greatest yet recorded
from an RS CVn binary.

2A 1052+606 = SAO 015338?
     W. Liller, Center for Astrophysics, reports that two echelle
spectrograms taken by R. E. McCrosky with the 155-cm telescope at
Harvard's Agassiz Station reveal that SAO 015338, located on the
northern edge of the HEAO-l error box and close to the most probable
position for the x-ray source 2A 1052+606, has moderately
strong H-alpha emission.  The strength of the neighboring absorption
lines indicates a spectral type of early K9 and to find H-alpha in
emission is sufficiently unusual to make this star a prime candidate
for the x-ray source counterpart.  The HEAO-1 position was supplied
by H. Gursky and R. Griffiths, Center for Astrophysics.

     Further positions have been reported as follows:

     1978 UT             R. A. (1950) Decl.        m1    Observer
     Feb.  8.37047    18 45 31.61   -47 33 18.7    8-9   Schuster
          11.673      19 08.2       -44 45         6.9   Page

H.-E. Schuster (European Southern Observatory).  100-cm Schmidt
   telescope.  3' tail to southwest.  Measurer: R. M. West.
A. A. Page (Mount Tamborine Observatory).  20-cm f/4.5 astrograph.
   Central condensation diameter 4', diffuse envelope diameter 8',
   diffuse spine 12' long, possible tenuous linear tail ~ 40' long.

     Corrigendum.  On IAUC 3172, q for Herald's orbit should read
0.4828 AU, not 0.4976.

1978 February 22               (3176)              Brian G. Marsden

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