Optical spectroscopy of GX 339-4 - I. Orbital modulation
نویسندگان
چکیده
منابع مشابه
Optical Spectroscopy of GX 339 - 4 - Paper I : Orbital Modulation
Optical spectroscopic observations of GX 339-4 were carried out between 1998 May (X-ray high state) and 1999 May (X-ray low state) over 7 epochs. The equivalent width of Hα increased during the high state then decreased during the low state. The equivalent width of HeII λ4686 decreased over both states. The full-width half-maximum of Hα, Hβ, HeII λ4686 and the Bowen blend increased from 1998 to...
متن کاملIs Gx 339 � 4 a Black Hole Candidate ? Optical Spectroscopy
We carried out spectroscopic and photometric observations of the candidate black-hole binary GX 339?4 during its low-hard and high-soft X-ray states. We have found that the emission lines from GX 339?4 have asymmetric, apparently round-topped prooles in the low-hard state (1997 May), and double-peaked prooles in the high-soft state (1998 April and August). Our data do not show obvious velocity ...
متن کاملOptical Spectroscopy of GX 339−4 during the High-Soft and Low-Hard States
We carried out spectroscopic observations of the candidate black hole binary GX 339−4 during its low-hard and high-soft X-ray states. We have found that the spectrum is dominated by emission lines of neutral elements with asymmetric, roundtopped profiles in the low-hard state. In the high-soft state, however, the emission lines from both neutral and ionised elements have unambiguously resolved ...
متن کاملMOST Radio Monitoring of GX 339 − 4
The Molonglo Observatory Synthesis Telescope (MOST) has been monitoring the candidate Galactic black hole binary system GX339−4 at 843 MHz since 1994 April. We present the results of this program up to 1997 February and show a possible correlation between radio and X-ray light curves.
متن کاملOSSE Observations of GX 339 � 4
The Oriented Scintillation Spectrometer Experiment on the Compton Gamma Ray Observatory observed the Galactic black hole candidate GX 339?4 as a target of opportunity in 1991 September, in response to the outburst reported by BATSE. We report here on energy spectra in the 50 keV to 10 MeV range obtained by OSSE. The source was detected from 50 to 400 keV at a level relative to the Crab nebula o...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2003
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2003.06516.x