HS1552+2730 = RX J1554.2+2721, AP CrB

This is the polar with the second-highest field strength (150MG, just beaten by AR UMa), and it has a period in the gap. Photometric observations suggest that it spends most time in a relatively inactive state, but it may occasionally get brighter. Monitoring is essential to establish the detailed long-term variability, which may shed some light on the question why high-field polars seem to be rather inactive compared to most low-field polars.

Literature

Jiang, X. J., Engels, D., Wei, J. Y., Tesch, F., Hu, J. Y., 2000. New cataclysmic variables from the RASS, Astronomy & Astrophysics 362, 263

Tovmassian, G. H., Greiner, J., Zharikov, S. V., Echevarria, J., Kniazev, A., 2001. The new cataclysmic variable RX J1554.2+2721 in the period gap, Astronomy & Astrophysics 380, 504

Thorstensen, John R., Fenton, William H, 2002. RX J15542+2721: An Apparently Magnetic Cataclysmic Variable with a 2.53 Hour Orbital Period, PASP 114, 74

Gänsicke, B. T., Jordan, S., Beuermann, K., de Martino, D., Szkody, P., Marsh, T. R., Thorstensen, J., 2004. A 150 MG Magnetic White Dwarf in the Cataclysmic Variable RX J1554.2+2721, Astrophysical Journal Letters 613, 141

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