Phase resolved spectroscopy of burst oscillations: Searching for rotational doppler shifts

Strohmayer, Tod E.
June 2000
AIP Conference Proceedings;2000, Vol. 522 Issue 1, p375
Academic Journal
X-ray brightness oscillations with frequencies from 300–600 Hz have been observed in six low mass X-ray binary (LMXB) bursters with the Rossi X-ray Timing Explorer (RXTE). These oscillations likely result from spin modulation of a hot region on the stellar surface produced by thermonuclear burning. If this hypothesis is correct the rotational velocity of the stellar surface, approx. 0.1 c, will introduce a pulse phase dependent Doppler shift such that the rising edge of a pulse should be harder (blue shifted) than the trailing edge (red shifted). Detection of this effect would both provide further compelling evidence for the spin modulation hypothesis as well as providing new observational techniques with which to constrain the masses and radii of neutron stars. In this work I present results of an attempt to search for such Doppler shifts. © 2000 American Institute of Physics.


Related Articles

  • Luminous supersoft X-ray emission from the recurrent nova U scorpii. Kahabka, P. // AIP Conference Proceedings;2001, Vol. 599 Issue 1, p682 

    BeppoSAX detected luminous 0.2-2.0 keV supersoft X-ray emission from the recurrent nova U Sco λ19-20 days after the peak of the optical outburst in February 1999. The spectral fit requires a very hot ∼ 9 10[sup 5] K and luminous supersoft X-ray component and in addition a wind component....

  • ASCA observations of the new jet system XTE J1748-288. Kotani, T.; Kawai, N.; Nagase, F.; Namiki, M.; Sakano, M.; Takeshima, T.; Ueda, Y.; Matsuoka, M. // AIP Conference Proceedings;2001, Vol. 599 Issue 1, p462 

    XTE J1748-288 is the newly discovered transient with a one-sided radio jet. It was observed with ASCA on 1998/09/06 and 1998/09/26, 100 days after the onset of the radio-X-ray outburst. The spectra were expressed with an attenuated power-law model, and the 2-6-keV flux was 4.6[sup +1.0, -0.8] x...

  • The signature of supernova ejecta in the X-ray afterglow of the γ-ray burst 011211. Reeves, J.N.; Watson, D.; Osborne, J.P.; Pounds, K.A.; O'Brien, P.T.; Short, A.D.T.; Turner, M.J.L.; Watson, M.G.; Mason, K.O.; Ehle, M.; Schartel, N. // Nature;4/4/2002, Vol. 416 Issue 6880, p512 

    Analyzes an x-ray spectrum of the afterglow of γ-ray bursts (GRB) 11211. Emission of nonmetal elements; Precedence of supernova explosion from a massive stellar progenitor after GRB; Emission of X-ray line to arise on a variety of processes.

  • Extracting neutron star properties from X-ray burst oscillations. Weinberg, Nevin; Miller, M. Coleman; Lamb, Donald Q. // AIP Conference Proceedings;2000, Vol. 522 Issue 1, p371 

    Many thermonuclear X-ray bursts exhibit brightness oscillations. The brightness oscillations are thought to be due to the combined effects of non-uniform nuclear burning and rotation of the neutron star. The waveforms of the oscillations contain information about the size and number of burning...

  • Determination of the Rotational Relaxation Cross Section of Carbon Dioxide from Spectral Measurements. Strekalov, M. L. // Optics & Spectroscopy;Jan2005, Vol. 98 Issue 1, p1 

    The pressure-induced transformation of the spectrum of the Q branch of the ν1 mode (1388 cm–1) of CO2 molecules is quantitatively interpreted. The contributions to the width of the spectrum from three relaxation mechanisms—vibrational dephasing, rotational relaxation, and the...

  • Radiation reflection from an optical inhomogeneity moving in a right- and left-handed medium. Rosanov, N. N. // Optics & Spectroscopy;Nov2009, Vol. 107 Issue 5, p768 

    The parametric Doppler effect in a medium whose dielectric permittivity and magnetic permeability become negative in some spectral range is analyzed with respect to uniform plane waves. The regime in which the medium is right-handed (the refractive index is positive) for incident radiation and...

  • Relationship between bipolar moments and molecule-frame polarization parameters in Doppler... Rakitzis, T. Peter; Hall, Gregory E.; Costen, Matthew L.; Zare, Richard N. // Journal of Chemical Physics;11/15/1999, Vol. 111 Issue 19, p8751 

    Studies the relationship between bipolar moments and molecule-frame polarization parameters in Doppler photofragment spectroscopy. Value of the angle between the probe laser polarization and the detection axis; Equivalence of the two formalisms and relationships between the bipolar moments and...

  • High-resolution rotation–vibration spectroscopy of difluorophosphorane: A combined theoretical and experimental study. Beckers, H.; Breidung, J.; Bürger, H.; Kuna, R.; Rahner, A.; Schneider, W.; Thiel, W. // Journal of Chemical Physics;10/1/1990, Vol. 93 Issue 7, p4603 

    The harmonic and anharmonic force fields of PH3F2 have been calculated at the ab initio self-consistent-field level using polarized split-valence and triple-zeta basis sets. PH3F2 has been prepared in pure form and identified unambiguously in the gas phase by Doppler-limited Fourier transform...

  • GRB 070912-A gamma-ray burst recorded from the direction to the galactic center. Minaev, P.; Grebenev, S.; Pozanenko, A.; Molkov, S.; Frederiks, D.; Golenetskii, S. // Astronomy Letters;Oct2012, Vol. 38 Issue 10, p613 

    The detection of GRB 070912 recorded in the field of view of the SPI, IBIS/ISGRI, and JEMX telescope on September 12, 2007, at 073219 (UT) when analyzing the INTEGRAL archival data is reported. The burst is one of the well-localized events closest to the direction toward the Galactic center...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics