Central Bureau for Astronomical Telegrams
IAUC 2805: Poss. N IN Sgr; G 208-44/45; HZ 43
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Circular No. 2805
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
POSSIBLE NOVA IN SAGITTARIUS
Dr. K. Osawa, Director of the Tokyo Astronomical Observatory,
cables that Yoshikuyi Kuwano, Hita, Oita, has discovered a possible
nova at R.A. = 17h55m.3, Decl. = -28o22' (equinox 1950.0). Photovisual
magnitudes are: July 13.51 UT, 8.4; 14.57, 8.8; 15.55, 8.8. The object
was not present on a Tri-X film exposed on July 8.
G 208-44/45
S. Cristaldi and M. Rodono, Catania Astrophysical Observatory,
write: "Flare activity has been discovered in the large proper motion
pair G 208-44/45 (R.A. = 19h53m, Decl. = +44o.4, equinox 1950.0; V =
13.41 and 13.99), which has recently been recognized by Harrington
et al. (1974, Astrophys. J. 194, L87) as a nearby binary system
located at a distance of only 4.7 pc. Since the system is physically
very similar to the red-dwarf binary L 726-8 (UV Cet), we started
patrolling it in May with the Catania 91-cm Cassegrain reflector.
On July 6.867 UT we detected a UV Cet-type flare with peak amplitude
almost equal to the joint luminosity of the pair at minimum.
Both components (about 8" apart) were included in the entrance
diaphragm of the photometer. Although spectra of the stars are not
available, the absolute magnitudes and colors and the flare
activity suggest a spectral type of M6Ve or somewhat later."
HZ 43
C. C. Wu, P. R. Wesselius, R. J. van Duinen, J. W. G. Aalders
and K. S. de Boer, Space Research Department, Kapteyn Institute,
University of Groningen, write: "HZ 43 (R.A. = 13h14m.0, Decl. = +29o22',
equinox 1950.0), a possible optical counterpart of the soft x-ray
source MX1313+29, was observed between 1550 and 3300 A in five energy
channels with the ultraviolet instrument on board the Astronomical
Netherlands Satellite. Observations were made once on 1974
Dec. 26.11 UT and four times between 1975 June 27.19 and 27.67 UT.
The ultraviolet flux was at 1.14 x 10**-9 erg cm**-2 s**-1 and no
significant change was detected in this six-month period. Spectral
energy distribution gives a blackbody temperature of 57 000 K.
Numerous pointings were made closer to the expected position of MX
1313+29 (R.A. = 13h13m.4, Decl. = +29o33', equinox 1950.0), but no
ultraviolet signal was detected in an area of 2'.5 by 2'.5."
1975 July 22 (2805) Brian G. Marsden
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