Parkes observations for project P1386 semester 2026APRS_05

J0045-7319 is a B star/pulsar binary in the Small Magellanic Cloud (SMC) with an orbital period of 51 days. The system is highly eccentric, with a closest approach of only 6 B-star radii, and it offers an unusual probe into massive stars in the SMC. Although similar systems exhibit strong dispersion measure (DM) variation during periastron arising from the stellar wind, observations in 1996 on the Parkes 70 cm receiver found no evidence of a wind from the B star. We request an additional 15 hours of observations on J0045-7319 to follow up on our current project.

J0045-7319是小麦哲伦星系（Small Magellanic Cloud，SMC）中的B型星（B star）与脉冲星组成的双星系统，轨道周期为51天。该系统轨道偏心率极高，近心距仅为6倍B型星半径，为探究小麦哲伦星系内的大质量恒星提供了独特的观测探针。尽管同类系统会因恒星风（stellar wind）作用在近星点（periastron）处产生显著的色散量（dispersion measure，DM）变化，但1996年基于帕克斯70厘米射电接收机的观测并未发现该B型星存在星风的证据。本次我们申请对J0045-7319开展额外15小时的观测，以跟进当前的研究项目。