Central Bureau for Astronomical Telegrams
IAUC 4657: EASYLINK 62794505; QU VULPECULAE: A Corr; FO Aqr
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Circular No. 4657
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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QU VULPECULAE: A CORRECTION
The observations reported on IAUC 4656 refer, not to QU Vul,
but to the Wolf-Rayet star HD 192163 = SAO 69592.
FO AQUARII
J. P. Osborne, EXOSAT Observatory; and K. Mukai, Mullard Space
Science Laboratory, report: "Following re-analysis of the published
times of photometric orbital minimum of the intermediate polar FO Aqr
(H2215-086), noting two new long observations obtained on 1988
July 28 and Aug. 6, an orbital period of 4.85 hr is definitely
preferred over the currently accepted 4.03 hr. This is particularly
well illustrated by the new light curves (5.5 and 6.3 hr long,
respectively), which show only one minimum each, in both cases at a
time close to that predicted to be maximum intensity by the 4.03-hr
ephemeris of Shafter and Macry (1987, MNRAS 228, 193). According to
that ephemeris, two minima should have been seen in each of the new
observations. A period of 4.85 hr is the 1-day alias of the currently
accepted 4.03-hr period, and was originally suggested by Shafter and
Targan (1982, A.J. 87, 655). Our ephemeris for the time of minimum
intensity is: T(min) = HJD 2446081.3028(26) + 0.2020594(6) E.
The 1988 light curves also show that the maxima due to the 21-min
white dwarf rotation period were occurring 7.5 min early with respect
to the quadratic ephemeris of Shafter and Macry."
1988 September 27 (4657) Daniel W. E. Green
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