Photospheres of Hot Stars. II. an Analysis of Zeta Puppis
Abstract
High signal-to-noise ratio line profiles of ζ Puppis (O4f) obtained with a CCD camera are compared with theoretical model atmospheres that include radiation scattered back from the stellar wind onto the photosphere, an effect referred to as wind blanketing. The best-fit wind-blanketed model for the observed mass loss rate of 5×10-6M_sun;yr-1 yields the following properties of ζ Puppis: Teffective = 42,000±1500K, log g = 3.5±0.1, helium abundance by number, [Y] = 0.17±0.03. If one assumes a distance modulus of 8.2±0.4 mag, ζ Puppis has a bolometric magnitude of -10.1±0.4, a radius of 18±4 R_sun;, and current mass of 36 (+21, -15) M_sun;.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1986
- DOI:
- 10.1086/164545
- Bibcode:
- 1986ApJ...308..728B
- Keywords:
-
- Hot Stars;
- Photosphere;
- Spectrum Analysis;
- Stellar Evolution;
- Stellar Spectrophotometry;
- Charge Coupled Devices;
- Electromagnetic Scattering;
- Line Spectra;
- Stellar Atmospheres;
- Stellar Models;
- Stellar Temperature;
- Stellar Winds;
- Astrophysics;
- LINE PROFILES;
- STARS: ATMOSPHERES;
- STARS: EARLY-TYPE;
- STARS: EVOLUTION;
- STARS: INDIVIDUAL CONSTELLATION NAME: ZETA PUPPIS