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The discovery of RE 1307 + 535: the shortest period AM Her system

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posted on 27.01.2016, 12:14 by Julian Paul Osborne, A. P. Beardmore, P. J. Wheatley, P. Hakala, M. G. Watson, K. O. Mason, B. J. M. Hassall, A. R. King
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.

History

Citation

Monthly Notices Of The Royal Astronomical Society, 1994, 270 (3), pp. 650-662 (13)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Monthly Notices Of The Royal Astronomical Society

Publisher

Wiley-blackwell

issn

0035-8711

eissn

1365-2966

Acceptance date

06/05/1994

Copyright date

1994

Available date

27/01/2016

Publisher version

http://mnras.oxfordjournals.org/content/270/3/650.short

Language

en