This week we have a look at a star in one of our more southern target region. The field centred on the eruptive young variable star Gaia19fct. There are many other young stars in this field, including the candidate young star IRAS 07063-1016.

In the light curve above we show the V, R, and I-band data for this object. The field has only been added to HOYS since the namesake Gaia19fct was discovered. Hence, the data only go back about 4r. But the object has a nice and interesting light curve. While it varies by less than 1mag (some YSOs vary by much more), the brightness changes are almost at this full range on timescales down to a week.

Such fast changes do tend to indicate quite compact structures with ‘sharp’ edges in the inner disk. The dimming events also do not last very long, so the structures are also quite compact. The changes in colour and brightness do strongly hint that the material in the clumps causing the dimming, is made of dust grains significantly larger than the material in the interstellar medium. This is one of the details the students are currently looking into systematically. So we’ll discuss this in more detail in the future….