Central Bureau for Astronomical Telegrams
IAUC 5297: N Her 1991; V1333 Aql
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Circular No. 5297
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
NOVA HERCULIS 1991
E. M. Leibowitz, H. Mendelson, and E. Mashal, Tel Aviv University,
report: "Testing our own prediction concerning the periodicity
in the light curve of Nova Her 1991 (IAUC 5265), we have observed
the star on June 19/20 with the CCD camera of the Wise Observatory.
A clear, 0.3-mag-deep local minimum was observed in the B and R
light curves of the nova on June 20.058 UT, as predicted with the
P/2 periodicity of our previous announcement. The possibility that
the period is P/4 or P/7 has been eliminated by our observations of
the star on May 30. We conclude with a very high level of confidence
that the period of the system is P = 1.487946 +/- 0.000035
days. Radial velocity measurements would be invaluable."
R. R. Joyce, Kitt Peak National Observatory, writes: "A
spectrogram (range 1.1-2.6 microns; resolving power about 250) of Nova
Her 1991 was obtained on June 20.4 UT with the Cryogenic Spectrometer
on the KPNO 1.3-m telescope. Emission lines at 1.742, 1.965, and
2.479 microns were unambiguously detected; identification of the two
longer-wavelength lines with [Si VI] 1.960-microns and [Si VII]
2.481-microns confirms the suggestion (IAUC 5282) of a coronal line
emission in this object. The 1.742-micron line remains unidentified.
Possible emission lines were detected at 1.253 and 1.280 microns.
Photometry from June 21.4: J = 13.1 +/- 0.2; H = 12.6 +/- 0.1; K =
10.25 +/- 0.05; L = 7.30 +/- 0.05."
V1333 AQUILAE
S. A. Ilovaisky and C. Chevalier, Observatoire de Haute-
Provence, communicate: "V1333 Aql, the optical counterpart of the
low-mass, recurrent x-ray transient Aquila X-1, first detected in
activity in late May (IAUC 5281), has been brightening steadily in
June. CCD photometry obtained June 17-19 with the OHP 1.2-m
telescope shows that the object has now reached V = 17.3, which is a
full two magnitudes above quiescence and is typical of other recent
active states. Fourier analysis of photometry obtained on 33 nights
with the same telescope during the 1990 active state (IAUC 5036,
5107), reveals a sinusoidal modulation of 0.4 mag in V (peak to
peak) with a period of 18.9 hr, superposed onto a variable base
level that fluctuated around a mean value of V = 17.8."
1991 July 2 (5297) Daniel W. E. Green
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