Open AccessXMM–Newton observations of three short‐period polars: V347 Pav, GG Leo and EU UMa
Author(s) -
Ramsay Gavin,
Cropper Mark,
Mason K. O.,
Córdova F. A.,
Priedhorsky W.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07242.x
Subject(s) - physics , astrophysics , white dwarf , accretion (finance) , orbital period , light curve , accretion disc , mass ratio , cataclysmic variable star , astronomy , stars
We present phase‐resolved XMM–Newton data of three short‐period polars: V347 Pav, GG Leo and EU UMa. All three systems show one dominant accretion region, which is seen for approximately half the orbital cycle. GG Leo shows a strong dip feature in its X‐ray and ultraviolet (UV) light curves, which is due to absorption of X‐rays from the accretion site by the accretion stream. The emission in the case of EU UMa is dominated by soft X‐rays: its soft/hard X‐ray ratio is amongst the highest seen in these objects. In contrast, GG Leo and V347 Pav shows a ratio consistent with that predicted by the standard shock model. We infer the mass of the white dwarf and explore the effect of restricting the energy range on the derived parameters.