COMMISSIONS 27 AND 42 OF THE IAU
             INFORMATION BULLETIN ON VARIABLE STARS
                          Number 3874

                                            Konkoly Observatory
                                            Budapest
                                            28 April 1993

                                            HU ISSN 0374 - 0676


            NOTE ON THE INTERMEDIATE POLAR RE 0751+14


The intermediate polar RE 0751+14 was first found as an extreme-ultraviolet
source in the ROSAT UK Wide Field Camera all-sky survey (Mason et al., 1992).
Andronov (1993) studied 24 Sternberg/Crimean archival plates and detected a
brightness variation between 13.65m and 14.17m pg.

Several types of large scale photometric behaviour are present among the one
dozen known intermediate polars and DQ Herculis stars, where the magnetic white
dwarf primaries are spinning faster than the orbital period of the pair. I
therefore checked the location of the object on several hundred Sonneberg sky
patrol plates taken between 1956 and 1992 mainly by H. Huth and B. Fuhrmann.
None of the 493 exposures of a threshold of 12.5m pg and deeper showed any
eruption of the kind of EX Hya. Moreover, on those numerous patrol plates
which reach 14.5m the image of the star is always visible and is varying
between 13.8m and 14.2m. The same is true for 41 exposures with a limiting
magnitude of 15.0m or better, taken with a 14 cm astrograph between 1929 and
1931 and scatteredly during the sixties. This confirms, on a much larger
basis, the findings of Andronov (1993), whose comparison stars were used in the
present investigation. The result is in agreement with those authors who
separate EX Hya from the bulk of intermediate polars (e.g. Vogt, 1992).

It cannot be completely excluded, however, that (contrary to outbursts)
depressions of the brightness (short ones, or longer lasting low states) might
have happened undetected within the time interval spanned by our material.

I thank Dr. Andronov for directing my attention to this object, and the German
Bundesministerium fur Forschung und Technologie for funds under contract no.
05-5S0414


                          W. WENZEL
                          Sternwarte
                          D O-6400 Sonneberg
                          Germany

References:

Andronov, I. L., 1993, Inform. Bull. Var. Stars No. 3828
Mason, K. O. et al., 1992, Mon. Not. R. Astron. Soc., 258, 749 [BIBCODE 1992MNRAS.258..749M ]
Vogt, N., 1992, Astron. Soc. Pacific Conf. Ser., 29, 253 [BIBCODE 1992ASPC...29..252C ]