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Long-Term Monitoring of the Accreting Pulsar GX 1+4

Chakrabarty, Deepto and Bildsten, Lars and Chiu, John and Grunsfeld, John M. and Koh, Towsian and Prince, Thomas A. and Finger, Mark H. and Wilson, Robert B. (1994) Long-Term Monitoring of the Accreting Pulsar GX 1+4. In: The Second Compton Symposium. AIP Conference Series. Vol.304. No.304. American Institute of Physics , New York, NY, pp. 285-289. ISBN 1-56396-261-6.

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We present preliminary results from two years of GRO/BATSE hard X‐ray (20–100 keV) monitoring of the ∼120 s accretion‐powered pulsar GX 1+4. Daily pulse frequency measurements from 1991 April to 1993 September show an average spin‐down of ḟ≊−5×10^(−12) s^(−2), with increases in the spin‐down rate during high‐luminosity intervals. The 20–100 keV pulsed flux spectrum for the interval TJD 8393–8406 is fit by a power‐law index of 2.56±0.04. Optical spectroscopy of the suggested red giant companion V2116 Oph taken during the 1993 September X‐ray outburst from GX 1+4 show considerably strengthened emission line features, supporting the association.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Chakrabarty, Deepto0000-0001-8804-8946
Prince, Thomas A.0000-0002-8850-3627
Additional Information:© 1994 American Institute of Physics. Published online 20 June 1994. We acknowledge the significant contributions to this work by the entire BATSE instrument team at NASA/MSFC. We also thank F. K. Lamb for useful comments. This work is supported in part by NASA grants NAGW-1919, NAGW-2920, and NAG 5-1458, as well as a Lee A. DuBridge fellowship to L.B. funded by the Weingart Foundation.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANAG 5-1458
Lee A. DuBridge FellowshipUNSPECIFIED
Weingart FoundationUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1993-34
Series Name:AIP Conference Series
Issue or Number:304
Record Number:CaltechAUTHORS:20140520-094539152
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45839
Deposited By: Deborah Miles
Deposited On:01 Jun 2014 15:39
Last Modified:10 Nov 2021 17:17

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