Other
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.270..650o&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 270, NO. 3/OCT1, P. 650, 1994
Other
20
Scientific paper
We report on a ROSAT Wide Field Camera EUV survey observation of RE 1307+535 which, together with optical spectroscopic and photometric observations, shows that this object is an AM Her system. These observations reveal that RE 1307+535 has an orbital period of 79.69 min, the shortest orbital period known for such a system. RE 1307+535 was observed by us in both high (V 17-18) and low (V 20-21) states, with evidence of cyclotron emission being seen in both cases. We use the high-state spectroscopy to show that the optical emission comes from a region with a magnetic field, B 30-40 MG. We derive EUV temperature and luminosity limits. IRCAM infrared photometry is used to put a lower limit on the distance to RE 1307+535 of d> 705 pc. RE 1307+535 is thus one of the most distant AM Her systems known, and is the first that is at a measured distance of z> 630 pc above the Galactic plane. Key words: binaries: close - stars: individual: RE 1307+535 - stars: magnetic fields - stars: variables: other - ultraviolet: stars.
Beardmore Andrew P.
Hakala Pasi
Hassall B. J. M.
King Andrew R.
Mason Keith O.
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