zYBC — Bolometric Corrections for Cosmologically Redshifted Stars
The zYBC database provides bolometric corrections for cosmologically redshifted stars with dust extinction, as an update to the YBC database. These bolometric corrections are derived by redshifting stellar spectra from public spectral libraries, attenuated by extinction curves for both the host galaxy dust and the Milky Way, and convolved with transmission curves of various photometric filters. The methodology naturally incorporates the cosmological K-correction and dust effects.
Citation: Chen Y., Fu X., Girardi L., Todt H., Bressan A., “Bolometric correction for cosmologically redshifted stars with dust: an update to the YBC database”
Spectral Libraries
| Library | Type | Teff range | log g / log Rt | Metallicity |
|---|---|---|---|---|
| CK03 / ATLAS9 | LTE | 3.5–50 kK | 0.0–5.0 | [M/H] −5.5 to +0.5 |
| PHOENIX / BT-Settl | LTE | 2.6–50 kK | 0.5–6.0 | [M/H] −4.0 to +0.5 |
| PoWR Wolf-Rayet | NLTE + wind | log T* 4.4–5.4 | log Rt −0.8 to 1.9 | MW, LMC, SMC, sub-SMC |
| PoWR OB | NLTE + wind | 15–50 kK | 2.0–4.4 | MW, LMC, SMC, sub-SMC |
| TLUSTY | NLTE | 15–55 kK | 1.75–4.75 | Z = 0 to 0.034 |
| CMFGEN | NLTE + wind | ~23–55 kK | ~2.5–4.4 | LMC, SMC |
| WM-basic | NLTE + wind | log Teff 4.3–5.0 | 2.5–6.0 | Z = 0.0001 to 0.02 |
Photometric Systems
- CSST/mSC — Chinese Space-station Survey Telescope main Survey Camera (NUV, u, g, r, i, z, y)
- JWST/NIRCam wide — James Webb Space Telescope NIRCam wide-band filters
- CSST/MCI — Chinese Space-station Survey Telescope Multi-Channel Imager
Parameter Grid
- Redshift: z = 0, 0.5, 1, 2, 3, 4, 5
- Galactic extinction: AV = 0, 0.1, 0.2, 0.3, 0.4, 0.5 (O'Donnell 1994, RV=3.1) — included within each FITS file
- Environmental extinction: αV = 0, 0.5, 1.0, 2.0, 5.0 (Calzetti 2000) — ISM extinction at the star's redshift
Downloads
The BC tables in FITS format can be downloaded from the Downloads page, organized by filter set and spectral library. Batch download is available per model or per library category.