A search for periodicities in the X-ray emission from cataclysmic variables

Michael Eracleous, Joseph Patterson, Jules Halpern

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We present the results of a search for periodicities in the X-ray emission from cataclysmic variables observed with the Einstein Observatory's IPC. The search was conducted in the energy band 0.16-3.5 keV and covered the frequency range 0.01-2.5 Hz. We show power spectra for 51 observations of 31 systems and derive upper limits to the pulse fractions of signals that are not detected. We find that the majority of systems show no coherent periodicities in their X-ray emission, which is consistent with a model in which the X-rays are produced in a disk/white dwarf boundary layer. The X-ray emission from AE Aqr is found to be modulated with a period of 33.08 s, which agrees with the period found in its optical light, and in GK Per we find evidence of higher harmonics of the 351 s oscillations detected by EXOSAT. The objects V603 Aql and SU UMa can be considered candidate magnetic systems, based on the periodicities found, but further observations are needed for confirmation.

Original languageEnglish (US)
Pages (from-to)330-340
Number of pages11
JournalAstrophysical Journal
Volume370
Issue number1
DOIs
StatePublished - Mar 20 1991

Fingerprint

cataclysmic variables
periodicity
periodic variations
x rays
HEAO 2
energy bands
power spectra
boundary layers
observatory
boundary layer
frequency ranges
oscillation
harmonics
oscillations
pulses
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Eracleous, Michael ; Patterson, Joseph ; Halpern, Jules. / A search for periodicities in the X-ray emission from cataclysmic variables. In: Astrophysical Journal. 1991 ; Vol. 370, No. 1. pp. 330-340.
@article{bec4ea5a75f048c48e21714423d1a3f5,
title = "A search for periodicities in the X-ray emission from cataclysmic variables",
abstract = "We present the results of a search for periodicities in the X-ray emission from cataclysmic variables observed with the Einstein Observatory's IPC. The search was conducted in the energy band 0.16-3.5 keV and covered the frequency range 0.01-2.5 Hz. We show power spectra for 51 observations of 31 systems and derive upper limits to the pulse fractions of signals that are not detected. We find that the majority of systems show no coherent periodicities in their X-ray emission, which is consistent with a model in which the X-rays are produced in a disk/white dwarf boundary layer. The X-ray emission from AE Aqr is found to be modulated with a period of 33.08 s, which agrees with the period found in its optical light, and in GK Per we find evidence of higher harmonics of the 351 s oscillations detected by EXOSAT. The objects V603 Aql and SU UMa can be considered candidate magnetic systems, based on the periodicities found, but further observations are needed for confirmation.",
author = "Michael Eracleous and Joseph Patterson and Jules Halpern",
year = "1991",
month = "3",
day = "20",
doi = "10.1086/169819",
language = "English (US)",
volume = "370",
pages = "330--340",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

A search for periodicities in the X-ray emission from cataclysmic variables. / Eracleous, Michael; Patterson, Joseph; Halpern, Jules.

In: Astrophysical Journal, Vol. 370, No. 1, 20.03.1991, p. 330-340.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A search for periodicities in the X-ray emission from cataclysmic variables

AU - Eracleous, Michael

AU - Patterson, Joseph

AU - Halpern, Jules

PY - 1991/3/20

Y1 - 1991/3/20

N2 - We present the results of a search for periodicities in the X-ray emission from cataclysmic variables observed with the Einstein Observatory's IPC. The search was conducted in the energy band 0.16-3.5 keV and covered the frequency range 0.01-2.5 Hz. We show power spectra for 51 observations of 31 systems and derive upper limits to the pulse fractions of signals that are not detected. We find that the majority of systems show no coherent periodicities in their X-ray emission, which is consistent with a model in which the X-rays are produced in a disk/white dwarf boundary layer. The X-ray emission from AE Aqr is found to be modulated with a period of 33.08 s, which agrees with the period found in its optical light, and in GK Per we find evidence of higher harmonics of the 351 s oscillations detected by EXOSAT. The objects V603 Aql and SU UMa can be considered candidate magnetic systems, based on the periodicities found, but further observations are needed for confirmation.

AB - We present the results of a search for periodicities in the X-ray emission from cataclysmic variables observed with the Einstein Observatory's IPC. The search was conducted in the energy band 0.16-3.5 keV and covered the frequency range 0.01-2.5 Hz. We show power spectra for 51 observations of 31 systems and derive upper limits to the pulse fractions of signals that are not detected. We find that the majority of systems show no coherent periodicities in their X-ray emission, which is consistent with a model in which the X-rays are produced in a disk/white dwarf boundary layer. The X-ray emission from AE Aqr is found to be modulated with a period of 33.08 s, which agrees with the period found in its optical light, and in GK Per we find evidence of higher harmonics of the 351 s oscillations detected by EXOSAT. The objects V603 Aql and SU UMa can be considered candidate magnetic systems, based on the periodicities found, but further observations are needed for confirmation.

UR - http://www.scopus.com/inward/record.url?scp=0038998455&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0038998455&partnerID=8YFLogxK

U2 - 10.1086/169819

DO - 10.1086/169819

M3 - Article

AN - SCOPUS:0038998455

VL - 370

SP - 330

EP - 340

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -