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.
http://resolver.caltech.edu/CaltechAUTHORS:20140520-094539152
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Abstract
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 |
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| 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. |
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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NASA | NAGW-1919 | | NASA | NAGW-2920 | | NASA | NAG 5-1458 | | Lee A. DuBridge Fellowship | UNSPECIFIED | | Weingart Foundation | UNSPECIFIED |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1993-34 |
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| Record Number: | CaltechAUTHORS:20140520-094539152 |
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| Persistent URL: | http://resolver.caltech.edu/CaltechAUTHORS:20140520-094539152 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 45839 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
Deborah Miles
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| Deposited On: | 01 Jun 2014 15:39 |
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| Last Modified: | 27 Nov 2017 18:30 |
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