[vsnet-alert 1412] Eclipsing binary in LMC with Delta Cephei star

[Rudolf Novak <rudolfn@physics.muni.cz>]

Dear colleagues,
I hope that it's not illeagal to include original IAUC message.
Maybe our southern friends could try to jion campaign to observe this
quite interesting eclipsing binary containing Delta Cephei star.
Have a nice day

Rudolf

ECLIPSE OF LMC CLASSICAL CEPHEID
     D. Welch, Department of Physics and Astronomy, McMaster University,

communicates: "The MACHO collaboration (cf. IAUC 6312) has discovered
a 4.97-day-period classical cepheid in the Large Magellanic Cloud in an
eclipsing-binary system the next primary minimum of which will occur on
Feb. 25.0 (+/- 3) UT.  The system is located at R.A. = 05h20m25s.1,
Decl.
= -70d11'08" (equinox 2000.0), has an orbital period of 400 days and an
out-of-eclipse mean magnitude and color of V = 14.55, V-R = +0.07.  The
V semiamplitude of the system outside eclipse is about 0.05 mag.  The
radial-velocity semiamplitude of the cepheid or its companion is likely
about 30 km/s, making the system useful for a determination of dynamical

masses.  Primary eclipse is between one and two weeks in total duration,

during which the system becomes as faint as V = 15.2 and R = 15.1.
It should be noted that the LMC will be progressively less well-placed
for observing during primary eclipses in the following five years."
Potential observers are requested to contact Welch at
welch@physics.mcmaster.ca, or by telephone at +1-905-525-9140 (extension

23186) to coordinate observations.




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Rudolf Novak                                                 h-page:
http://vsnet.sci.muni.cz/~rudolfn
Nicholas Copernicus Observatory                              e-mail:
rudolfn@physics.muni.cz
  and Planetarium in Brno                                      Czech
readers could try IBT at:
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