Central Bureau for Astronomical Telegrams
IAUC 3500: NOVALIKE Var IN Vir; AM Her; 1308+32
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Circular No. 3500
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 VARIABLE IN VIRGO
J. Maza, University of Chile, reports the discovery, by E.
Gonzalez, of a novalike variable at R.A. = 12h23m04s, Decl. = +13o10'.2
(equinox 1950.0). On July 11.984 UT, mpg = 14; on Aug. 4.990, mpg
= 16. The object is not present on six plates during Jan.-June.
AM HERCULIS
J. Patterson, Harvard-Smithsonian Center for Astrophysics; and
C. Price, University of Michigan, communicate: "Spectrophotometry
at McGraw-Hill Observatory during the current minimum of AM Her
shows the presence of narrow Balmer emission lines and what appear
to be the absorption features of an M star. H-alpha moves with K ~ 120
km/s, reaching maximum velocity of approach 0.07 +/- 0.06 cycles before
the M star does. The Balmer decrement is normal, I(H-alpha)/I(H-beta)
= 3.3. Thus the narrow lines appear to come from the heated
atmosphere of the M star, as at maximum light. The continuum light
source is apparently the M star beyond 650 nm, but it is quite blue
at shorter wavelengths. Remarkably, there are nevertheless
absorption features in the blue (He II 468.6 nm, Ca I 422.7 nm, probably
the G band, and several unidentified features near H-beta and H-gamma). A
quasisinusoidal light variation at the orbital period is present.
At 440 nm the light-curve maximum occurs at magnetic phase 0.52.
At 610 nm maximum occurs at phase 0.25. The peak-to-peak amplitude
of the variation is 14 percent. On July 18 the star was at V =
15.35, B-V = -0.05, U-B = -0.95, V-R = +1.09."
1308+32
W. Z. Wisniewski, University of Arizona; S. L. Mufson, Indiana
University; and J. T. Pollock, University of Florida, report a
rapid outburst of the BL-Lac object 1308+32 in June-July. On
plates taken with the Florida 0.76-m telescope on June 12 B = 17.1.
(Typically B-V = +0.45 for this object.) With the Arizona l.5-m
telescope photoelectric V magnitudes were 15.50 on July 3, 15.05 on
July 4, 14.39 on July 5, 14.31 on July 6 and 14.88 on July 8. By
July 17 plates showed that B had again fallen to 17.1. The measurements
on July 4 and 5 imply that the V-band luminosity flared by
2 x 10**38 J/s in one day. This estimate assumes the emission to be
isotropic and the emission-line redshift, z = 0.996 (Miller et al.
1978, Pittsburgh Conf., p. 178), cosmological (H = 75 km s**-1 Mpc**-1).
1980 August 14 (3500) Brian G. Marsden
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