Central Bureau for Astronomical Telegrams
IAUC 3472: 1980c; OPTICAL CANDIDATE FOR LMC X-1; STEPANYAN'S STAR
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Read IAUC 3473
Circular No. 3472
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
PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1980c)
H. Kosai, Tokyo Astronomical Observatory, telexes that T. Seki,
Geisei, has recovered this comet as follows:
1980 UT R. A. (1950) Decl. m1
May 1.44896 4 29.4 +16 14 15
6.46042 5 03.0 +16 17 15
A further exposure on May 6 also shows a very faint image of the
comet. On the other exposures the comet is diffuse, with
condensation but without tail. The position is in very close agreement
with the prediction on MPC 5227.
OPTICAL CANDIDATE FOR LMC X-1
M. Pakull, European Southern Observatory, reports: "Spectra of
the 14.5-mag star 32 (Cowley et al. 1978, A.J. 83, 1619) were
obtained with the 3.6-m telescope and the image dissector scanner.
They show He II 468.6-nm and N III-C III 464-465-nm emissions with
strength comparable to that seen in most massive x-ray binary systems
(0.08-nm equivalent width for the He II 468.6-nm emission
line). The star is separated by 6" from the previously suggested
counterpart, R 148, and lies within 4" of the most probable HEAO-1
position for LMC X-1 (Johnston et al. 1979, Ap.J. 233, 514). The
position of star 32 has been determined to be R.A. = 5h40m05s.5, Decl. =
-69o46'03".6 (equinox 1950.0, rms error 0".5)."
STEPANYAN'S STAR
A. Sanyal, Department of Physics and Astronomy, Howard University,
communicates: "Spectra obtained on Feb. 8 at phase 0.54 (IAUC
3466) indicate the presence of a G8V absorption spectrum, blue-shifted
by 140 km/s, in addition to Balmer H, He I and He II 468.6-nm
emission. On Feb. 9 the H-beta emission full width was 1775 km/s,
with possible P Cyg absorption at 1350 km/s. The radius of an
assumed edge-on, circular, relative orbit is 1.1 x 10**6 km, indicating
a mass of 1.38 Msol for the collapsed companion. A maximum limiting
distance of 630 pc has been estimated for this high-galactic-latitude
object."
1980 May 7 (3472) Brian G. Marsden
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