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IAUC 3290: VV Pup; 4U 1700-37; 1977g; 1977n

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IAUC number 

                                                  Circular No. 3290
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


VV PUPPIS
     W. J. Luyten, University of Minnesota; and J. Liebert, Steward
Observatory, report that a substantial proper motion has been measured
for the polarized variable star VV Pup.  This object has previously
been catalogued as BPM 72636, despite its lying in a crowded
Milky Way field.  The use of two Bruce plates at epochs 1899.33
and 1931.05 with two Palomar plates at 1954.23 and 1968.17 yielded
mu_ra = +0".025, mu_decl = -0".097 (per year), or mu = 0".100 in p.a. 165o.0
(with estimated maximum error +/- 0".02).  This result supersedes the
marginal measurement using only a 9-year baseline quoted by Liebert
et al. (1978, Astrophys.J. Oct. 1 issue) and is in good agreement
with the BPM catalogue measurement.  A significant proper motion
for VV Pup is consistent with the assumption that the system has a
distance comparable to 100 pc and a luminosity at minimum light in
the range of white dwarfs.  Coordinated x-ray and optical observations
should be emphasized.


4U 1700-37
     J. Surdej, European Southern Observatory, reports that optical
observations of HD 153919 = 4U 1700-37 made at La Silla on June 15
at binary phase 0.5 (x-ray source in front) show apparent oscillations
with period 95 +/- 3 min in accordance with the claim by A.
Kruszewski (1978, Inf. Bull. Variable Stars No. 1424).  This period
is consistent with that of x-ray pulsations (cf. IAUC 3193).  The
amplitude is 0.01 magnitude in V and smaller or absent in U and B.
The variations in a narrow-band filter centered on He II 4686 A are
of amplitude 0.01 magnitude and show a secondary minimum.


PERIODIC COMET ASHBROOK-JACKSON (1977g)
     Total visual magnitude estimates: Sept. 24.23 UT, 11.3 (C. S.
Morris, Prospect Hill Observatory, 15-cm reflector); 29.11, 11.7 (J.
Bortle, Brooks Observatory, 32-cm reflector); Oct. 1.92, 11.3 (G. S.
Keitch, Wrington, Avon, England, 20.3-cm reflector); 3.10, 11.5
(Bortle); 7.13, 11.6 (Bortle); 9.14, 11.6 (Bortle, tail 7' p.a. 230o).


PERIODIC COMET COMAS SOLA (1977n)
     Total visual magnitude estimate by A. Hale, Annapolis, MD (41-cm
reflector): Oct. 8.39 UT, 13.0, strongly condensed.


1978 October 17                (3290)              Brian G. Marsden

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