Fundamental parameters and infrared excesses of Hipparcos stars

TL;DR

This study derives fundamental stellar parameters for over 100,000 Hipparcos stars using multi-survey spectral energy distributions, creating a true Hertzsprung-Russell diagram and analyzing infrared excesses related to circumstellar matter.

Contribution

It presents a comprehensive method to determine stellar parameters and infrared excesses by combining data from multiple infrared and optical surveys, improving understanding of giant star dust production.

Findings

Giant star dust production begins around 680 Lsun.

Identified and quantified infrared excesses in a large stellar sample.

Placed stars accurately on a true Hertzsprung-Russell diagram.

Abstract

We derive the fundamental parameters (temperature and luminosity) of 107 619 Hipparcos stars and place these stars on a true Hertzsprung-Russell diagram. This is achieved by comparing BT-Settl model atmospheres to spectral energy distributions (SEDs) created from Hipparcos, Tycho, SDSS, DENIS, 2MASS, MSX, AKARI, IRAS and WISE data. We also identify and quantify from these SEDs any infrared excesses attributable to circumstellar matter. We compare our results to known types of objects, focussing on the giant branch stars. Giant star dust production (as traced by infrared excess) is found to start in earnest around 680 Lsun.