Theta1 Microscopii

Lore & Background

Theta1 Microscopii is a suspected binary star system located approximately 179 light years from Earth. The primary star is an A-type main-sequence star with a stellar classification of A7VpSrCrEu, where the suffix notation indicates abundance anomalies of strontium, chromium, and europium. It is an Ap star, a chemically peculiar star with strong metallic lines in its spectrum. The star is 437 million years old, with 2.3 times the mass of the Sun and 2.4 times the Sun's radius. It radiates 36 times the luminosity of the Sun from its photosphere at an effective temperature of 9,240 K.

The primary is an α2 CVn variable with a period of 2.125 days and a magnitude ranging from 4.77 to 4.87. Its companion is a magnitude 7.42 star at an angular separation from the primary along a position angle of 46°, as of 2018.

Reader's Guide

Theta1 Microscopii holds significance as a representative of the α2 CVn class of variable stars, which are chemically peculiar A-type stars with strong magnetic fields and rotational modulation of their light curves. Its classification as an Ap star with strontium, chromium, and europium anomalies makes it a valuable object for studying atomic diffusion and magnetic fields in stellar atmospheres. The suspected binary nature adds further interest, as the companion's influence on the primary's evolution or variability remains an open question. The system's brightness and proximity allow for detailed spectroscopic and photometric study, contributing to the broader understanding of chemically peculiar stars and their variability mechanisms. Its legacy lies in serving as a benchmark for models of stellar magnetism and chemical peculiarity in intermediate-mass stars.

Did You Know?

• The star has abundance anomalies of strontium, chromium, and europium.
• The companion has a magnitude of 7.42 and was at a position angle of 46° in 2018.