Central Bureau for Astronomical Telegrams
IAUC 4289: N And 1986; EXO 023432-5232.3
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Circular No. 4289
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 617-495-7244/7440/7444
NOVA ANDROMEDAE 1986
Y. Andrillat, Laboratoire d'Astronomie, Montpellier, telexes:
"Spectrograms (range 330-505 nm, dispersions 2 and 8 nm/mm)
obtained on Dec. 15.79, 18.74 and 21.73 UT with the Haute Provence
1.5-m and 1.2-m telescopes show broad and intense emission lines:
Balmer H beta-H15, Fe II (multiplets 27, 28, 37, 38, 42, 43), Ti II
(1, 6, 7, 13, 14, 19), O I (15, 16, 18), Cr II, K (3), He I (14,
18) and Ca II (H, K). The interstellar Ca lines are strong. All
the emissions are flanked by a blueshifted absorption component
with mean radial velocity -1190 km/s (Dec. 15), -1230 km/s (Dec.
18) and -1270 km/s (Dec. 21). The Balmer lines H beta-H9 exhibit a
second absorption component at -2005 km/s (Dec. 15), -2105 km/s
(Dec. 18) and -2150 km/s (Dec. 21)."
EXO 023432-5232.3
K. Beuermann, Technische Universitat Berlin and MPI fur
Extraterrestrische Physik, Garching; H.-C. Thomas, MPI fur
Astrophysik, Garching; and P. Giommi and G. Tagliaferri, EXOSAT
Observatory, Space Science Dept. of ESA, report the discovery of a
new x-ray emitting probable AM Her binary. The source, located at
2h34m31s.8, -52 32'19" (equinox 1950.0, uncertainty +/-7"), was found
as a serendipitous x-ray source with the low energy telescope of
the EXOSAT satellite. The mean count rate was 8.6 x 10-3 cts/s,
obtained with the CMA detector and the 3000 Lexan filter. The
position permitted unique identification with a 19-mag star. CCD
spectrophotometry obtained in 1986 July and Oct. using the MPI
2.2-m telescope at ESO revealed a high-excitation emission-line
spectrum with a He II 469 nm:H beta intensity ratio of 0.35, a
spectroscopic and photometric orbital period of 114.62 +/- 0.02 min, and a
K-value of 388 +/- 20 km/s, obtained from a single-gaussian fit to
the Balmer lines. The orbital lightcurve is similar to that of
the AM Her stars 1E 1048.5+5421 and E1114+182, with a pronounced
dip occurring at radial velocity maximum. Orbital light variation
outside the dip is mainly due to a red continuum. Although
polarimetry is still lacking, EXO 023432-5232.3 is almost certainly
an AM Her star, the sixth AM Her star found in the period interval
113-115 min. Polarimetry of the system is encouraged.
1986 December 30 (4289) Brian G. Marsden
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