Observations of the eclipsing binary pulsar in Terzan 5

Details Observations of the eclipsing binary pulsar in Terzan 5 Observations of the eclipsing binary pulsar in Terzan 5

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361l..61n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. L61-L63. Research supported by NSF and U.S.

Astronomy and Astrophysics

Astronomy

41

Eclipsing Binary Stars, Pulsars, Radio Sources (Astronomy), Companion Stars, Stellar Evolution, Stellar Mass

Scientific paper

The eclipsing msec binary pulsar PSR 1744 - 24A was observed at radio frequencies between 800 MHz and 1.66 GHz. It is found that the pulsar is eclipsed behind its 0.1-solar-mass companion for up to half of each 109-min orbit, indicating that the companion's eclipsing region is much larger than its Roche lobe. Eclipse duration varies with observing frequency as nu exp beta, with beta = -0.63 + or - 0.18. The pulsed signal is weaker near eclipse boundaries, but no other changes in the pulses are observed. The signal sometimes disappears entirely for intervals as long as several hours. Delayed pulse arrival times after some such anomalous disappearances may suggest that they are caused by excess material in the vicinity of the binary system.

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