COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                       Number 2770

                                      Konkoly Observatory
                                      Budapest
                                      6 August 1985

                                      HU ISSN 0374 - 0676


               PHOTOMETRIC CONSTANCY OF IS Gem

  After the visual measures of Bemporad (1912), BD+32deg1414=IS Gem was
monitored, always visually, by Wroblewski (1962) and by Pogossiantz (1982).
They report a variation of about 0.3 mag. and a periodicity of 40-50 days,
although Pogossiantz's light curve does not seem to be much convincing.
Spectra with a dispersion of 35 angstrom/mm discussed by Crimi and Mantegazza (1984)
show a slight variation of the radial velocity close to the limits of 
observational errors and absence of spectral peculiarities.
  IS Gem was measured photoelectrically at the 50 cm telescope and spectroscopically 
at the 137 cm telescope of the Osservatorio Astronomico di Merate,
in the course of a program on variable stars of intermediate and late spectral
types (Poretti, 1984; Poretti and LeBorgne, 1985). Photoelectric measures
were carried out in V-light on 11 nights from 1983, October to 1984, February
and on 2 nights in 1985, January. HR 2586 and HR 2660 were used as comparison
star and check star respectively. For the instrumentation and data reduction
techniques, see Poretti (1984).
  The mean magnitudes obtained on these 13 nights prove constancy of IS Gem:
the mean value is +0.189 (standard deviation: +/-0.005) for HR 2586 minus IS Gem
and +0.366 (s.d.:+/-0.009) for HR 2586 minus HR 2660. IS Gem must therefore be
placed with VW Dra (Murnikova and Vasilyeva, 1979) in the list of constant
stars erroneously classified as SRd variables.

  IS Gem was also observed by GEOS from 1974 to 1982: a careful analysis of
the visual estimates does not show any intrinsic variation larger than 0.1 mag.
(Fumagalli, 1985), i.e. the probable error.

  Spectroscopic observations and a more complete discussion of V measures
will be published elsewhere later.



  E. PORETTI                              F. FUMAGALLI
  Osservatorio Astronomico di Brera       GEOS
  Via E. Bianchi, 46                      12, rue Bezout
  22055 Merate (CO) - Italia              75014 Paris - France


References:

Bemporad, A.: 1912. Astron. Nach. 191, 151 [BIBCODE 1912AN....191..151B ]
Crimi, G., Mantegazza, L.: 1984, Astrophys. Space Sci. 100, 255 [BIBCODE 1984Ap&SS.100..255C ]
Fumagalli, F.: 1985, GEOS SR, in press
Murnikova, V.P., Vasilyeva, S.V.: 1979, Variable Star Suppl., 18, 589 [BIBCODE 1979PZP.....3..589M ]
Pogossiantz, A. Yu.: 1982, Variable Star Suppl., 20, 278
Poretti, E.: 1984, Astrophys. Space Sci., 106, 201 [BIBCODE 1984Ap&SS.106..201P ]
Poretti, E., LeBorgne, J.F.: 1985, I.B.V.S. No. 2719
Wroblewski, A.: 1961, Urania 32, 1 21