A uniform set of optical/NIR photometric zero points to be used with CHORIZOS

TL;DR

This paper establishes a consistent set of optical and near-infrared photometric zero points across six systems, enhancing calibration accuracy for astronomical observations and integrating these into the CHORIZOS Bayesian analysis tool.

Contribution

It provides a unified set of zero points for six photometric systems, including new calibrations for 2MASS JHK_s, based on combined spectrophotometry and literature data.

Findings

Unified zero points for six photometric systems.

Implementation of zero points in the CHORIZOS Bayesian code.

Improved calibration accuracy for optical/NIR photometry.

Abstract

I have recently combined HST/STIS spectrophotometry with existing photometric data to analyze the calibration of three standard optical photometry systems: Tycho-2 B_TV_T, Stromgren uvby, and Johnson UBV. In this contribution I summarize those results, present new ones for 2MASS JHK_s, and combine them with recent literature results to generate a uniform set of zero points for six photometric systems, the above mentioned plus Cousins RI and SDSS ugriz. With the exception of the latter system, the zero points use the new Vega spectrum presented at this meeting by Ralph Bohlin. I also discuss the implementation of these results in CHORIZOS, a Bayesian photometric code that compares multi-filter observational data with spectral energy distributions to solve the inverse problem of finding the models which are compatible with the observations.