Bulgarian astronomers conducted long-term optical photometric observations of a young variable
V1180 Cas is located at a distance of about 1,950light years from Earth. This is a young pre-main sequence (PMS) variable star. It is associated with the dark cloud Lynds 1340 in the star-forming region of the constellation Cassiopeia. Previous observations of V1180 Cas revealed variability with an amplitude of about 6 magnitudes. This suggests the object is an eruptive young stellar object. However, further study of V1180 Cas showed that its variability differs from the variability of eruptive PMS stars such as FU Ori (FUor) and EX Lupi (EXor).
V1180 Cas and other stars. Credit: Mutafov et al., 2022
Therefore, in order to find out the true nature of thisstars, a team of astronomers from the Institute of Astronomy of the National Astronomical Observatory in Sofia, Bulgaria, took a close look at the object's variability. To do this, they used three telescopes from the Rozhen National Astronomical Observatory in Bulgaria and one telescope from the Skinakas Observatory in Greece. Data was collected from September 2011 to February 2022.
Observations have shown that V1180 Cas is differentvery strong photometric variability with large amplitude variations - up to 5 magnitudes. In general, the star’s brightness in the I-band remains in the range of 15–16 stars for most of the observed time. V. However, scientists also noticed some changes in brightness with a small amplitude, which is typical for T Tauri stars.
Observing and studying variable objects provides important insights into aspects of stellar structure and their evolution. This will also be useful for a better understanding of the distance scale of the Universe.
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