Central Bureau for Astronomical Telegrams
IAUC 3658: omicron And; OPTICAL COUNTERPART OF H0139-68; 1978 DA
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Read IAUC 3659
Circular No. 3658
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
omicron ANDROMEDAE
G. J. Peters, Department of Astronomy, University of Southern
California, writes: "In response to the recent announcement of H-alpha
emission in omicron And (IAUC 3650), I note that image-tube spectrograms
taken at Kitt Peak National Observatory during the past two years
reveal that the H-alpha emission and Balmer-line cores in omicron And have
slowly been increasing since 1980 Oct. Although it would be interesting
to monitor this star closely in order to compare its current
shell episode with the one of 1974-1976, the 'initial stages'
of the shell phase have most assuredly passed."
OPTICAL COUNTERPART OF H0139-68
N. Visvanathan, J. Hillier and A. Pickles, Mount Stromlo and
Siding Spring Observatories, telex: "The AM-Her-like variable star
identified with the soft x-ray source H0139-68 (IAUC 3649) has been
observed for linear polarization in the optical wavelengths on the
1- and 1.9-m telescopes. A polarization spike of amplitude 7
percent in the polarization-phase curve is seen. The phase at which
the polarization spike occurs does not coincide with that at which
the optical light reaches maximum. Our polarization indicates the
presence of cyclotron emission in the optical continuum of the
object, probably originating from one or both the poles of a magnetic
white dwarf. This supports our identification of the object as an
AM-Her binary system which is believed to contain a magnetic white
dwarf accreting matter from a lower-main sequence companion.
1978 DA
Continuation to the ephemeris on IAUC 3653:
For dT = +1d
1982 ET R. A. (1950) Decl. Delta r dR.A. dDecl. Mag.
Jan. 31 15 12.38 -18 39.0 0.682 1.092 -5m33 -10'8 19.6
Feb. 5 15 42.43 -18 04.7
10 16 12.04 -17 10.8 0.673 1.054 -4.66 -12.0 19.6
15 16 40.74 -16 00.1
20 17 08.15 -14 36.6 0.687 1.031 -3.77 - 9.4 19.6
25 17 34.01 -13 04.0
Mar. 2 17 58.22 -11 26.1 0.717 1.023 -2.96 - 4.2 19.7
7 18 20.73 - 9 46.2
12 18 41.62 - 8 06.6 0.758 1.031 -2.35 + 1.4 19.8
1982 January 15 (3658) Daniel W. E. Green
Read IAUC 3659
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