Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...459..717k&link_type=abstract
Astrophysical Journal v.459, p.717
Astronomy and Astrophysics
Astronomy
12
Stars: Pulsars: Individual Alphanumeric: Psr J0045-319, Galaxies: Magellanic Clouds, Stars: Binaries: General, Stars: Mass Loss, Stars: Atmospheres, Stars: Early-Type
Scientific paper
We report on multifrequency radio timing observations of the unique binary pulsar PSR J0045 - 7319, the only known radio pulsar in the Small Magellanic Cloud. Observations made at epochs near periastron and apastron, when the pulsar was at distances of 4 and 34 stellar radii from its B 1 V star companion, respectively, reveal no significant frequency dependence of the observed pulse-arrival times, implying a 3 a upper limit to variations of the integrated electron density along the line of sight of ADM <0.9 pc cm -3. Using simple geometric arguments we infer a 3 a upper limit to the ionized component of the B-star mass outflow of A < 3.4 x 10 11(V /Vesc) M_{0 }yr 1 This is the first constraint on a main-sequence B-star wind in the SMC and provides evidence in favor of the predicted metallicity dependence of models of radiation-driven winds in luminous stars.
Kaspi Victoria M.
Manchester Richard N.
Tauris Thomas M.
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