Synthetic photometry for carbon rich giants, I. Hydrostatic dust-free models

Details Synthetic photometry for carbon rich giants, I. Hydrostatic dust-free models Synthetic photometry for carbon rich giants, I. Hydrostatic dust-free models

2009-05-27

arxiv.org/abs/0905.4415v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

accepted for publication by Astronomy & Astrophysics, 16 pages, 20 figures

Scientific paper

We study the spectroscopic and photometric properties of carbon stars. In the first paper of this series we focus on objects that can be described by hydrostatic models neglecting dynamical phenomena like pulsation and mass loss. As a consequence, the reddening due to circumstellar dust is not included. Our results are collected in a database, which can be used in conjunction with stellar evolution and population synthesis calculations involving the AGB. We have computed a grid of 746 spherically symmetric COMARCS atmospheres covering effective temperatures between 2400 and 4000K, surface gravities from log(g) = 0.0 to -1.0, metallicities ranging from the solar value down to one tenth of it and C/O ratios in the interval between 1.05 and 5.0. Subsequently, we used these models to create synthetic low resolution spectra and photometric data for a large number of filter systems. The tables including the results are electronically available. We have selected some of the most commonly used colours in order to discuss their behaviour as a function of the stellar parameters. A comparison with measured data shows that down to 2800K the agreement between predictions and observations of carbon stars is good. Below this limit the synthetic colours are much too blue. The obvious reason for these problems is the neglect of circumstellar reddening and structural changes due to pulsation and mass loss.

Affiliated with

Also associated with

No associations

Rating

Synthetic photometry for carbon rich giants, I. Hydrostatic dust-free models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Synthetic photometry for carbon rich giants, I. Hydrostatic dust-free models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synthetic photometry for carbon rich giants, I. Hydrostatic dust-free models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-527717