Revised Stroemgren metallicity calibration for red giants
| dc.creator | Hilker, Michael | |
| dc.date | 1999-11-19 | |
| dc.date.accessioned | 2026-07-07T02:34:34Z | |
| dc.date.available | 2026-07-07T02:34:34Z | |
| dc.description | A new calibration of the Stroemgren (b-y),m_1 diagram in terms of iron abundance of red giants is presented. This calibration is based on a homogeneous sample of giants in the globular clusters omega Centauri, M22, and M55 as well as field giants from the list of Anthony-Twarog & Twarog (1998). Towards high metallicities, the new calibration is connected to a previous calibration by Grebel & Richtler (1992), which was unsatisfactory for iron abudances lower than -1.0 dex. The revised calibration is valid for CN-weak/normal red giants in the abundance range of -2.0 < [Fe/H]r $< 0.0 dex, and a color range of 0.5 < (b-y) < 1.1 mag. As shown for red giants in $ω$ Centauri, CN-weak stars with Stroemgren metallicities higher than -1.0 dex cannot be distinguished in the (b-y),m_1 diagram from stars with lower iron abundances but higher CN band strengths. | |
| dc.description | 9 pages, 6 figures, accepted for publication in Astronomy & Astrophysics | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9911387 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9911387 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/15294 | |
| dc.subject | Astrophysics | |
| dc.title | Revised Stroemgren metallicity calibration for red giants | |
| dc.type | text |