DR Chamaeleontis

DR Chamaeleontis (DR Cha), also known as HD 93237, is a star located in the southern circumpolar constellation Chamaeleon. The system has an average apparent magnitude of 5.97, allowing it to be faintly visible to the naked eye. DR Cha is located relatively far at a distance of 1,060 light years based on Gaia DR3 parallax measurements, but is receding with a poorly constrained heliocentric radial velocity of $$.

The visible component has been given several spectral classes over the years. It has been given a luminosity class of a giant star (III), a subgiant (IV), a dwarf star (V), and emission lines. Most sources generally agree that DR Cha is a B5 star. It has 6 times the mass of the Sun and 6.48 times its girth. It shines with a bolometric luminosity 1,587 times that of the Sun from its photosphere at an effective temperature of $$, giving it a blue hue. The object is estimated to be 50 million years old and spins modestly with a projected rotational velocity of $$.

In 1982, M. Jaschek listed DR Cha in a catalog of Be stars. It has been classified as an Algol-type eclipsing binary, having a period of 19.4436 days. However in 2022, Labadie-Bartz et al. examined the TESS data for this star, and found that the primary and secondary eclipses are separated by "about 20 days", which suggests that the 19.4436 day period published earlier may represent the time interval between primary and secondary eclipse, rather than the full orbital period.