Central Bureau for Astronomical Telegrams
IAUC 6186: PKS 1622-297; Var STAR IN Ser; GRO J1629-49
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Circular No. 6186
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)
PKS 1622-297
J. T. Bonnell and C. R. Shrader, Goddard Space Flight Center
(GSFC) and Universities Space Research Association; R. C. Hartman,
GSFC; W. T. Vestrand and J. G. Stacy, Space Science Center,
University of New Hampshire; and J. R. Webb, Florida International
University, communicate: "We detected the quasar PKS 1622-297 with
the International Ultraviolet Explorer (IUE) satellite using the
Long Wavelength camera in low-resolution mode during its period of
high-level activity in high- and low-energy gamma-rays (IAUC 6185).
The flux at 260 nm was about 10E-15 erg cmE-2 sE-1 AE-1 on July 1.
Subsequent IUE observations of this source on July 5, 6, and 8
suggest variability with the peak observed flux level occurring on
July 8. Further IUE observations are planned to coincide with
monitoring by the OSSE instrument onboard the Compton Gamma Ray
Observatory (through July 24). Observations at other wavelengths
continue to be very important."
VARIABLE STAR IN SERPENS
K. W. Hodapp, University of Hawaii, reports: "Observations
show that a young star located at R.A. = 18h27m16s.8, Decl. =
+1o14'15" (equinox 1950.0; uncertainty +/- 2"), deeply embedded in
the Serpens molecular cloud, brightened by 4.1 mag in the K band
(2.2 microns) in the past year. The following K magnitudes were
obtained with the University of Hawaii 2.2-m telescope (+ QUIRC
1024x1024 infrared camera): 1994 Aug. 15-17 UT, 17.7 +/- 0.3; 1995
July 12, 13.6 +/- 0.3. (The position and magnitudes are relative
to stars observed by Eiroa and Casali 1992, A.Ap. 262, 468). The
star now appears associated with a nebula extending 10" to the west.
Imaging at wavelengths of 2.06, 2.12, and 2.26 microns indicates
that this nebula is primarily continuum radiation, probably
scattered light. The star is invisible in the H band (1.6 microns),
even though the nebula remains partly visible; both the star and
the nebula are invisible in J (1.2 microns). The observed increase
in flux from this very young star is probably a FU Ori-type
outburst caused by an increase in mass accretion and a resulting
increase in disk luminosity."
GRO J1629-49
S. N. Zhang, B. A. Harmon, W. S. Paciesas, and G. J. Fishman
report, on behalf of the Compton Gamma Ray Observatory BATSE team,
that this source (IAUC 6182) was not detectable by BATSE between
June 29 and July 7. They set a 3-sigma upper limit of 50 mCrab
between 20 and 100 keV.
1995 July 13 (6186) Daniel W. E. Green
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