Central Bureau for Astronomical Telegrams
IAUC 5005: HD 34664; 1989c1
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Read IAUC 5006
Circular No. 5005
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
HD 34664
S. N. Shore, Computer Sciences Corporation, communicates: "
International Ultraviolet Explorer (IUE) low-dispersion observations
of the luminous extreme-emission-line Large Magellanic Cloud
supergiant HD 34664 = LH(alpha) 120-S22 = MWC 105 = Sk 64-67 (R.A. =
5h14m.0, Decl. = -67 30', equinox 1950.0; cf. Henize 1956, Ap.J.
Suppl. 2, 315; Sanduleak 1970, Contrib. CTIO No. 89) taken on Apr.
15.6 and 24.0 UT show that the star has recently undergone massive
shell ejection. The 120- to 330-nm integrated flux is 2.70 x 10E-10
erg cmE-2 sE-1, compared with archival data (1981 Sept. 28.5) having
an integrated 120- to 330-nm flux of 4.28 x 10E-10 erg cmE-2 sE-1.
The 1981-to-1990 flux ratio is 1.7 longward of 160 nm, and between
1.7 and 3.4 shortward of 160 nm, with a peak opacity enhancement at
about 140 nm, consistent with deep Fe II absorption. Fe II bands at
157, 161, and 180 nm are much stronger now than in 1981; Mg II 280-
nm and Mg I 284-nm emission may be weakly present. O I 130-nm
emission may also be present, but this feature is more likely a low-
opacity window. There is an upper limit to the velocity difference
in the absorption lines between the two spectra of 80 km/s (120-290
nm). The Fine Error Sensor magnitude is 11.7, about the same as in
1981. HD 34664 has displayed one of the most extreme optical Fe II
and [Fe II] emission spectra of any of the massive LMC supergiants.
This star is likely now in the luminous blue variable shell ejection
phase, having been stable during 1980-1983 when previous observations
were obtained. Optical and infrared observers should be on alert
for future, possibly dramatic, changes in this star."
COMET AUSTIN (1989c1)
C. M. Telesco and C. M. Benson, Marshall Space Flight Center,
NASA; and H. Campins and S. C. Tegler, University of Florida, report:
"We have obtained the first thermal infrared images of comet Austin.
The observations were made at 10.8 microns using the MSFC spatial
bolometer array at the NASA Infrared Telescope Facility on Apr. 30.6
and May 1.6 UT. The maximum dimensions spanned by the maps are
approximately 80" (in R.A.) x 30" (in Decl.). A preliminary reduction
indicates a peak flux density (identical on both dates) of 23 +/- 2
Jy in a 4".2 x 4".2 pixel. The extended emission shows a higher flux
density west of the nucleus. The flux densities near the edge of
the maps are typically 0.5 Jy/pixel."
1990 May 3 (5005) Daniel W. E. Green
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