Simultaneous ASCA and HST/GHRS observations of Cygnus X-2/V1341 Cygni
نویسندگان
چکیده
منابع مشابه
Simultaneous HST/ASCA Observations of LMC X-4: X-ray Ionization Effects on a Stellar Wind
We present first results from simultaneous ultraviolet (HST/GHRS) and X-ray (ASCA) observations of the 13.5s pulsar LMC X-4 taken in 1996 May. The ASCA observations covered 1.12 binary orbits (1.58 days) and the HST observations were centered on this for roughly 0.4 orbital phase coverage (0.56 days). The GHRS data are the highest resolution (both temporal and spectral) ultraviolet spectra ever...
متن کاملar X iv : a st ro - p h / 99 02 05 2 v 1 3 F eb 1 99 9 ASCA observation of the Cygnus Loop Supernova Remnant
We present here the results of the mapping observation of the Cygnus Loop with the Gas Imaging Spectrometer (GIS) onboard the ASCA observatory. The data covered the entire region of the Cygnus Loop. Spatial resolution of the GIS is moderate whereas the energy resolving power is much better than those used in the previous observations. The ASCA soft-band image shows the well-known shell-like fea...
متن کاملSimultaneous Asca and Rxte Observations of Cygnus X-1 during Its 1996 State Transition
We report results from simultaneous ASCA and RXTE observations of Cygnus X-1 when the source made a rare transition from the hard (5low) state to the soft (5high) state in 1996. These observations together cover a broad energy range ∼0.7–50 keV with a moderate energy resolution at the iron K band and thus make it possible to disentangle various spectral components. The low-energy spectrum is do...
متن کاملOptical spectroscopy and Doppler tomography of Cygnus X - 2
We present phase resolved optical spectroscopy and Doppler tomography of V1341 Cygni, the optical counterpart to the neutron star low mass X-ray binary Cygnus X-2. We derive a radial velocity curve for the secondary star, finding a projected radial velocity semi-amplitude ofK2 = 79±3 km s , leading to a mass function of 0.51± 0.06 M⊙, ∼30% lower than the previous estimate. We tentatively attrib...
متن کاملNew Measurements of Orbital Period Change in Cygnus X - 3
A nonlinear nature of the binary ephemeris of Cygnus X-3 indicates either a change in the orbital period or an apsidal motion of the orbit. We have made extended observations of Cygnus X-3 with the Pointed Proportional Counters (PPCs) of the Indian X-ray Astronomy Experiment (IXAE) during 1999 July 3−13 and October 11−14. Using the data from these observations and the archival data from ROSAT, ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003