Central Bureau for Astronomical Telegrams
IAUC 3369: NOVALIKE OBJECT IN Cen; BRIGHT Be STARS; SN IN NGC 4321
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Read IAUC 3370
Circular No. 3369
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
NOVALIKE OBJECT IN CENTAURUS
R. M. Hjellming, National Radio Astronomy Observatory, reports
detection with the Very Large Array of a variable radio source at
the position R.A. = 14h55m19s.54 +/- 0s.05, Decl. = -31o28'07" +/- 2" (equinox
1950.0), which is coincident with the novalike object (cf. IAUC
3362) identified with the transient x-ray source in Centaurus (cf.
IAUC 3360). The radio source was first detected at 4885 MHz at the
0.003-Jy level on May 25, rose to a peak of 0.008 Jy 3 days later,
and decreased to a level of 0.001 Jy by June 2.
BRIGHT Be STARS
G. F. Pollitsch, Munich University Observatory, telexes:
"Coude spectra (dispersion 12 A/mm) of bright Be stars were obtained
during May 24-30 with the 152-cm reflector at the European
Southern Observatory. The stars HD 105382, 135160, 142184, 157246
and 224686, listed in Jaschek's 1971 catalogue, do not show any
emission at H-alpha. HD 173948, which did not show emission in 1977
Sept., now has double emission again at H-alpha."
SUPERNOVA IN NGC 4321
G. and A. de Vaucouleurs, McDonald Observatory, report the
following provisional reduction of photoelectric observations with the
205-cm reflector:
1979 UT V B-V U-B 1979 UT V B-V U-B
May 27.20 13.25 +0.70 +0.03 May 30.15 13.43 +0.70 +0.05
28.19 13.31 +0.70 +0.05 31.15 13.51 +0.69 +0.04
29.15 13.38 +0.68 +0.05
The linear lightcurves in U, B and V (slopes +0.07, +0.05 and
+0.035 magnitude/day) during the first 40 days past estimated
maximum on Apr. 19 +/- 2 at V ~ 12.0, B-V ~ +0.1 and U-B ~ -0.7 is
consistent with type II L of Barbon, Ciatti and Rosino (1979, Astron.
Astrophys. 72, 287). There is no hint of a plateau yet. The
color-color relation (uncorrected for galactic or internal reddening, if
any) is still close to a black-body curve with an apparent color
temperature Tc = 5600 K (versus Tc = 11 000 K on Apr. 23); both
color indices became constant after May 27, also in agreement with
mean type II behavior.
1979 June 8 (3369) Daniel W. E. Green
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