Central Bureau for Astronomical Telegrams
IAUC 4594: N Oph 1988; DO Dra; OS And
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Circular No. 4594
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 617-495-7244/7440/7444
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
NOVA OPHIUCHI 1988
W. G. Weller and S. R. Heathcote, Cerro Tololo Interamerican
Observatory, telex: "Low-dispersion spectra (range 350-710 nm,
resolution 0.5 nm) were obtained on May 5.4 UT with the 2D-Frutti
photon-counting system on the Yale 1.0-m telescope. The spectrum is
dominated by the Balmer series, lines being clearly detected down to
H9. Except for H alpha, all the Balmer lines exhibit P-Cyg profiles
with a strong emission component and a weak violet absorption. The
Balmer decrement, measured by integrating the flux over the whole line
profile, including the absorption dip, is H alpha: H beta: H gamma:
H delta: H epsilon = 690:100:29:13.8:7.6. The corresponding quantity
for the emission component alone is 680:100:30:16:9.8. Permitted
lines corresponding to various multiplets of Fe II, the strongest of
them being at 492.4, 501.8 and 516.9 nm (multiplet 42), are seen, as
is He I 587.6 nm. Higher-dispersion spectra (range 390-510 nm,
resolution 0.2 nm) were obtained at the same time with the CTIO 1.5-m
telescope using a GEC CCD as detector. The emission component of the
Balmer lines has a heliocentric velocity of -32 +/- 10 km/s and FWHM
1025 +/- 10 km/s. The principal violet absorption component has a
velocity of -1340 +/- 10 km/s for the H I line and -1285 +/- 10 km/s
for the Fe II lines; the mean FWHM is 360 km/s. A second,
significantly weaker, absorption dip ia seen at a velocity of -790
km/s for the H I lines and at -680 km/s for Fe II. Further additional
absorption dips are seen in the peaks of H beta and H delta at a
velocity of -135 km/s."
Visual magnitude estimates: Apr. 26.48, 9.7 (D. A. J. Seargent,
The Entrance, N.S.W.); 29.66, 10.2 (R. H. McNaught, Coonabarabran,
N.S.W.); May 1.47, 10.1 (Seargent); 3.48, 9.4 (Seargent); 4.62, 9.6:
(McNaught); 5.83, 9.7 (McNaught); 7.14, 10.4 (A. Pereira, Linda-a-
Velha, Portugal); 8.50, 9.9 (McNaught); 9.44, 9.9 (Seargent); 10.56,
9.9 (McNaught).
DO DRACONIS
Visual magnitude estimates: Apr. 1.02, 10.6 (G. Dyck, North
Dartmouth, MA); 1.86, 11.3 (P. Schmeer, Bischmisheim, West Germany);
2.02, 13.4 (Dyck); 2.86, [12.4 (Schmeer).
OS ANDROMEDAE
Visual magnitude estimates by M. Verdenet, Bourbon-Lancy, France:
Feb. 12.77 UT, 14.4; 19.8, 14.4; 20.8, 14.4; 21.8, 14.4.
1988 May 11 (4594) Brian G. Marsden
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