Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..513s&link_type=abstract
Astronomy and Astrophysics 288, 513-518 (1994)
Astronomy and Astrophysics
Astrophysics
27
Cataclysmic Variables, Stars: Individual: Rxj1940.1-1025, X-Rays: Stars, Galaxies: Seyfert, Galaxies: Individual: Ngc 6814
Scientific paper
We confirm the report by Madejski et al. that the X-ray flux of the newly discovered ROSAT source (RXJ1940.1-1025), 37 arc min away from NGC 6814, is periodically modulated at 3.4 hours. This source is in fact responsible for the modulation earlier attributed to the X-ray flux from the Seyfert galaxy NGC 6814. The source was optically identified with a blue emission line object of V=~16mag. The optical spectrum resembles that of a magnetic CV. The X-ray spectrum shows two distinct components: a soft black body component with kT_BB_=70eV and a hard power law component with a photon index of 1.1. We suggest that the object is either an AM Her or an intermediate polar (IP). A series of optical spectroscopic observations have established a sinusoidal radial velocity curve from the Hα emission line with a period of 12120+/-3s (90%) and half amplitude +/-165km/s.
Friedrich Stefan
James S. D.
Koenig Markus
Lamer Georg
Sharma Darma P.
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