Infrared spectroscopy of cataclysmic variables -- II. Intermediate polars | Zendy

V. S. Dhillon | Zendy; T. R. Marsh | Zendy; S. R. Duck | Zendy; S. R. Rosen | Zendy

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Infrared spectroscopy of cataclysmic variables -- II. Intermediate polars

Author(s) -

V. S. Dhillon,

T. R. Marsh,

S. R. Duck,

S. R. Rosen

Publication year - 1997

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/285.1.95

Subject(s) - physics , astrophysics , infrared , cyclotron , accretion (finance) , spectral line , intermediate polar , spectroscopy , emission spectrum , infrared spectroscopy , astronomy , magnetic field , stars , white dwarf , quantum mechanics

We present infrared (0.97-2.45 micron) spectra of the intermediate polars PQGem (RE0751+14), BG CMi and EX Hya. The spectra show strong Paschen, Brackettand HeI emission lines from the accretion disc/stream. The infrared continua ofPQ Gem and BG CMi can be represented by blackbodies of temperatures 4500 K and5100 K, respectively, or by power-laws of the form f_nu \propto nu^(0.6,0.9),respectively, and show no evidence of secondary star features. The continuum ofEX Hya is doiminated by water bands from the red-dwarf secondary star, whichhas a spectral type of ~M3. Despite showing circular polarization, PQ Gem andBG CMi show no evidence for cyclotron humps and hence we are unable to measuretheir magnetic field strengths; any cyclotron emission present must contributeless than ~3 per cent of the infrared continuum flux.Comment: 7 pages, 2 figure

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