Low frequency flickering of TT Arietis: Hard and soft X-ray emission region

Date

1997-01-01

Author

Baykal, Altan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

129
views

0
downloads

Using archival ASCA observations of TT Arietis, X-ray energy spectra and power spectra of the intensity time series are presented for the first time. The energy spectra are well-fitted by a two continuum plasma emission model with temperatures similar to 1 keV and similar to 10 keV. A coherent feature at similar to 0.643 mHz appeared in the power spectra during the observation.

Subject Keywords

Binaries, close, Stars, individual (TT Arietis), Stars, cataclysmic variables, X-rays, stars

URI

https://hdl.handle.net/11511/55171

Journal

ASTROPHYSICS AND SPACE SCIENCE

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

THE NOISE IN THE 35-D CYCLE OF HER X-1 Baykal, Altan; DEETER, JE; SCOTT, DM (1993-11-15) We calculate the power density spectrum of fluctuations in the X-ray turn-on times of Her X-1, including new data which extend the X-ray and optical flux observations to a span of over 20 yr with 221 distinct 35-d high-low flux cycles. If we assume that turn-on times define the period of the 35-d clock, this statistical interpretation of turn-on behaviour is consistent with a white-noise process in the first derivative of the 35-d phase fluctuations (or a random walk in clock phase). We discuss the implicat...
X-ray flux and pulse frequency changes of three high mass X-ray binary pulsars: Vela X-1, GX 301-2 and OAO 1657-415 Inam, SC; Baykal, Altan (2000-01-01) Using archival BATSE (Burst and Transient Source Experiment) 20-50 keV band X-ray flux and pulse frequency time series, we look for correlations between torque, luminosity and specific angular momentum for three high mass X-ray binary pulsars Vela X-1, GX 301-2 and OAO 1657-415. Our results show that there is no correlation between pulse frequency derivative and flux which may be an indication of the absence of stable prograde accretion disk. From the strong correlation of specific angular momentum and torq...
Low frequency magnetic resonance conductivity imaging by means of oscillating gradient fields Eroğlu, Hasan Hüseyin; Sadighi, Mehdi; Eyüboğlu, Behçet Murat (null; 2018-06-16) Recently, low frequency (LF) magnetic resonance electrical conductivity imaging by means of oscillating gradient fields is reported to be infeasible. In thesestudies, LF phase measurements are modeled with radio frequency (RF) leakage due to geometric shifts in MR images. Although RF leakage is related withconductivity, we have not come across a conductivity image reconstructed using this model. In this study, LF conductivity imaging is evaluated for an MRIpulse sequence including multiple gradient pulses. ...
Low-temperature absorption edge and photoluminescence in layered structured Tl2Ga2S3Se single crystals Hasanlı, Nızamı (2012-11-01) The absorption edge of undoped Tl2Ga2S3Se crystals have been studied through transmission and reflection measurements in the wavelength range 440-1100 nm and in the temperature range 10-300 K. The absorption edge was observed to shift toward lower energy values with increasing temperature. As a result, the rate of the indirect band gap variation with temperature gamma = -2.6 x 10(-4) eV/K and the absolute zero value of the band gap energy E-gi(0)=2.42 eV were obtained.
Low-temperature visible photoluminescence spectra of TlGaSe2 layered crystal Hasanlı, Nızamı; Aydinli, A; Baten, SMA (2000-02-01) The photoluminescence (PL) spectra of TlGaSe2 layered single crystals were investigated in the 8.5-35 K temperature, 0.2-15.2 W cm(-2) excitation laser intensity, and in the 600-700 nm wavelength range. The PL spectrum has a slightly asymmetric Gaussian lineshape with a peak position located at 1.937 eV (640 nm) at 8.5 K. The PL is quenched with increasing temperature. The blue shift of the PL peak and the sublinear increase of the PL intensity with increasing laser intensity is explained using the inhomoge...

Citation Formats

A. Baykal, “Low frequency flickering of TT Arietis: Hard and soft X-ray emission region,” ASTROPHYSICS AND SPACE SCIENCE, pp. 29–38, 1997, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/55171.