Space Reddenings for Fifteen Galactic Cepheids

TL;DR

This study determines space reddenings for 15 Galactic Cepheids by combining CCD BVRIc and 2MASS data, refining intrinsic color relations to improve reddening estimates.

Contribution

It introduces a method integrating optical and infrared data to accurately derive reddenings for Cepheids and nearby stars.

Findings

Reddenings for 15 Cepheids were successfully derived.

Several Cepheids exhibit large color excesses.

Modified intrinsic color relations improved reddening accuracy.

Abstract

Space reddenings are derived for 15 Galactic Cepheids from dereddening CCD BVRIc data for AF-type stars in the immediate vicinities of the variables, in conjunction with 2MASS reddenings for BAF-type stars in the same fields. Potential reddening solutions were analyzed using the variable-extinction method to identify stars sharing potentially similar distances and reddenings to the Cepheids, several of which have large color excesses. The intrinsic BVRIc color relation for AF dwarfs was modified slightly in the analysis in order to describe better the colors observed for unreddened stars in the samples.