We identify the likely optical counterpart to the Large Magellanic Cloud (LMC) supersoft X-ray source RX J0527.8-6954, and hence recover HV 2554. This identification is based on an analysis of ∼4 yr of optical photometry obtained serendipitously via the MACHO project. We see a steady fading of the star of ∼0.5 mag over the duration of the observations. Evidence is also presented for an orbital modulation of ∼0.05-mag semi-amplitude on a period of P = 0.39262 ± 0.00015 d. Our optical observations are consistent with the suggestion that the X-ray decline in this system is caused by cooling after a weak shell flash.
Áreas temáticas de ASJC Scopus
- Astronomía y astrofísica
- Ciencias planetarias y espacial