Spectroscopy of the AM Herculis type binary 2A 0311 - 227
نویسندگان
چکیده
منابع مشابه
ORFEUS II Far-UV Spectroscopy of AM Herculis
Six high-resolution (λ/∆λ ≈ 3000) far-UV (λλ = 910–1210 Å) spectra of the magnetic cataclysmic variable AM Herculis were acquired in 1996 November during the flight of the ORFEUS-SPAS II mission. AM Her was in a high optical state at the time of the observations, and the spectra reveal emission lines of O VI λλ1032, 1038, C III λ977, λ1176, and He II λ1085 superposed on a nearly flat continuum....
متن کاملAm Herculis Binaries in the Rosat Era
The current census of AM Herculis binaries and AM Her candidates exceeds 50 systems of which 29 are ROSAT discoveries. The increased number provides a basis to study the more general properties of the class. We discuss the space density, observations relevant to the evolution of magnetic CVs, the statistics of magnetic eld measurements, and current ideas on the accretion scenarios.
متن کاملHST / GHRS observations of AM Herculis ⋆
We present phase-resolved spectroscopy of AM Herculis obtained with the HST/GHRS when the system was in a high state. The ultraviolet light curve shows a quasi-sinusoidal modulation, which can be explained by a hot spot on the rotating white dwarf. The broad Lyα absorption expected for photospheric radiation of a moderately hot white dwarf is largely filled in with emission. The UV/FUV spectrum...
متن کاملCyclotron Modeling Phase-resolved Infrared Spectroscopy of Polars. Iii. Am Herculis and St Leo Minoris
We present phase-resolved low-resolution infrared spectra of AM Her and ST LMi, two low-field polars that we observedwith SPEX on the IRTF. Optical /NIR light curves are also published to help constrain the viewing geometry and brightness of the objects at the time they were observed. Currently, only limited IR spectra have been published for these objects, and none with the phase-coverage pres...
متن کاملHigh and low states of the system AM Herculis
Context. We investigate the distribution of optically high and low states of the system AM Herculis (AM Her). Aims. We determine the state duty cycles, and their relationships with the mass transfer process and binary orbital evolution of the system. Methods. We make use of the photographic plate archive of the Harvard College Observatory between 1890 and 1953 and visual observations collected ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1981
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/196.3.425