Tag: IRIS

October 11, 2024

Surface brightness-color technique applied to nearby RR Lyrae stars

Near-infrared data from OCM combined with high-resolution spectroscopic data and Gaia parallaxes lead to the determination of projection factors and mean radii for nine Galactic RR Lyrae stars.

Science

September 17, 2024

Projection factor and radii of nearby BL Her stars

Type II Cepheids might be an attractive alternative to classical Cepheids regarding the projection factor (p-factor), which is a crucial parameter in the Baade-Wesselink technique to determine the distance.

Science