Central Bureau for Astronomical Telegrams
IAUC 5043: COORDINATED Obs OF MIRA AB; 1990P; 1990M
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 5044
Circular No. 5043
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
COORDINATED OBSERVATIONS OF MIRA AB
M. Karovska and E. Guinan write: "From 1990 July through
1991 March, the Mira (omicron Ceti) AB system will be observed
from the ground using speckle interferometry techniques and from
space using the IUE satellite. Mira AB is a detached binary
system where a compact object accretes mass from the wind of a
pulsating red giant companion. This system is an ideal case for
detailed study of accretion processes in detached binaries: it
is nearby, bright, and easy to study at many wavelengths, and
can be easily resolved using speckle interferometry. This will
be a unique opportunity to determine accurately the energy
distribution and the luminosity of the hot component at ultraviolet
and optical wavelengths, and to test accretion theory and
theoretical models of accretion disks. The major objective of
this study is to determine the cause of Mira B's variability. We
will also study the effects of stellar pulsation on the extended
atmosphere and the stellar wind of Mira A. To optimize this
observing opportunity, we solicit coordinated, near-simultaneous
ground-based photometric (especially intermediate band photometry)
polarimetric, spectroscopic, infrared, and radio observations of
the Mira system. Mira A minimum light occurred in 1990 June, and
the maximum light is expected in 1990 Oct. Those interested in
participating in the observing campaign should contact M. Karovska
(Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138,
U.S.A.; telephone 617-495-7347; e-mail KAROVSKA@CFA.BITNET or
GUINAN@VUVAXCOM)."
SUPERNOVA 1990P IN ANONYMOUS GALAXY
Further to the information on IAUC 5039, R. H. McNaught
reports that no image appears at the position of SN 1990P on
U.K. Schmidt Telescope R survey films taken in 1981 and 1986.
SUPERNOVA 1990M IN NGC 5493
Visual magnitude estimates (cf. IAUC 5034): June 18.95 UT,
12.8 (A. Pereira, Caxias, Portugal; S Vir AAVSO chart); 21.81, 12.6
(R. Bunge, Mansfield, OH; RR Vir AAVSO chart); 22.90, 12.8 (A.
Boattini, Montelupo, Italy); 23.93, 13.1 (Pereira); 25.89, 13.8:
(Boattini, Florence, Italy).
1990 June 29 (5043) Daniel W. E. Green
Read IAUC 5044
Our Web policy. Index to the CBAT/MPC/ICQ pages.
