On the Variable Star (38'1905) RX Andromed
نویسندگان
چکیده
منابع مشابه
Rx J1856.5-3754: Bare Quark Star or Naked Neutron Star?
Recent Chandra observations have convincingly shown that the soft X-ray emission from the isolated neutron star candidate RX J1856.5-3754 is best represented by a featureless blackbody spectrum, in apparent contrast with the predictions of current neutron star atmospheric models. Moreover, the recently measured star distance (≈ 120−140 pc) implies a radiation radius of at most ∼ 5−6 km, too sma...
متن کاملTiming the Nearby Isolated Neutron Star Rx J1856.5−3754
RX J1856.5−3754 is the X-ray brightest among the nearby isolated neutron stars. Its X-ray spectrum is thermal, and is reproduced remarkably well by a black-body, but its interpretation has remained puzzling. One reason is that the source did not exhibit pulsations, and hence a magnetic field strength—vital input to atmosphere models—could not be estimated. Recently, however, very weak pulsation...
متن کاملOptical Observations of the Isolated Neutron Star RX J0720.4−3125
RX J0720.4−3125 is an unidentified bright soft X-ray source which shows pulsations at a 8.39 s period and has a thermal spectrum. We present deep B and R band images of its X-ray localization. We find one possible counterpart in the X-ray error box, with magnitudes B = 26.6±0.2 and R = 26.9±0.3. The very high X-ray to optical flux ratio confirms that this object is an isolated neutron star. We ...
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We report observations of a ROSAT-discovered cataclysmic variable, RX J2353.0-3852. The optical spectrum shows strong, double-peaked Balmer emission, embedded in absorption troughs from Hβ onwards and similarly doubled He I and Fe II emission; He II λ4686 is not seen. Optical light curves obtained in 1993 November show a periodicity at 5246 sec with its first three harmonics, and another at 228...
متن کاملOn the pulsation parallax of the variable star RR Lyr
We show that a straightforward application of the predicted relation connecting the absolute K magnitude of fundamental RR Lyrae variables to their period and metal content, together with current evolutionary predictions on the mass and luminos-ity of Horizontal Branch stars, supply a distance estimate to the prototype star RR Lyr in close agreement with the recent parallax determination by HST...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1906
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/66.5.335