53 Camelopardalis

Lore & Background

The system consists of a visible primary component and an unseen companion. The primary is a magnetic Ap star with stellar classification A3VpSrSiCrEu, indicating peculiar abundances of strontium, silicon, chromium, and europium. Its magnetic field topology is complex, and abundance variations of silicon, calcium, titanium, iron, and neodymium occur across the star's surface.

Tadeusz Jarzębowski discovered the star's variability in 1960. It is classified as an Alpha2 Canum Venaticorum type variable, with the combined brightness of the system varying from magnitude +6.00 to +6.05 over a rotationally modulated period of 8.0278 days. The primary has 2.1 times the Sun's mass and 2.4 times the Sun's radius, spinning with a projected rotational velocity of 12.5 km/s and a rotation period of 8.0268 days.

The star is about 615 million years old and radiates 25 times the Sun's luminosity from its photosphere at an effective temperature of 8,400 K. The orbital inclination is not fully constrained; the 'a sin i' value of the primary is 280 Gm.

Reader's Guide

53 Camelopardalis holds significance as a benchmark magnetic Ap star in a binary system, offering a rare opportunity to study the interplay between a complex magnetic field, surface abundance patches, and rotation in a chemically peculiar star. Its high orbital eccentricity of 0.7 and long 6.63-year period make it an important object for understanding binary dynamics and the evolution of magnetic stars. The star's variability, discovered by Tadeusz Jarzębowski, is rotationally modulated and typical of Alpha2 Canum Venaticorum variables, where changes in brightness arise from inhomogeneous distributions of elements like silicon and iron across the stellar surface. The system's legacy lies in its role as a well-observed example of how magnetic fields and chemical peculiarities manifest in intermediate-mass stars, providing constraints on stellar magnetic field generation and atmospheric processes. Its visibility to the naked eye under good conditions (baseline magnitude +6.02) also makes it accessible for amateur astronomers interested in variable star monitoring.

Did You Know?

• 53 Camelopardalis has the variable star designation AX Camelopardalis.
• The system's orbital eccentricity is about 0.7, with a period of 6.63 years.
• The primary star's rotation period is 8.0268 days, nearly matching the variability period of 8.0278 days.