Asteroseismology of the Nearby SN-II Progenitor: Rigel Part I. The MOST High Precision Photometry and Radial Velocity Monitoring
arXiv:1201.0843 · doi:10.1088/0004-637X/747/2/108
Abstract
Rigel (beta Ori, B8 Ia) is a nearby blue supergiant displaying alpha Cyg type variability, and is one of the nearest type-II supernova progenitors. As such it is an excellent test bed to study the internal structure of pre core-collapse stars. In this study, for the first time, we present 28 days of high precision MOST photometry and over 6 years of spectroscopic monitoring. We report nineteen significant pulsation modes of SNR>4.6 from radial velocities, with variability time scales ranging from 1.21 to 74.7 days, which are associated with high order low degree gravity modes. While the radial velocity variations show a degree of correlation with the flux changes, there is no clear interplay between the equivalent widths of different metallic and Halpha lines.
8 pages, 5 figures, 2 tables, Accepted for publication in ApJ
References in corpus (10)
- Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient
- Statistical properties of a sample of periodically variable B-type supergiants - Evidence for opacity-driven gravity-mode oscillations
- Most Detects G- and P-Modes in the B Supergiant HD 163899 (B2Ib/II)
- Observational evidence for a correlation between macroturbulent broadening and line-profile variations in OB Supergiants
- Periodic mass loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD50064
- Linear analyses for the stability of radial and nonradial oscillations of massive stars
- Time, spatial, and spectral resolution of the Halpha line-formation region of Deneb and Rigel with the VEGA/CHARA interferometer
- CoRoT high-precision photometry of the B0.5 IV star HD 51756
- A Five-year Spectroscopic and Photometric Campaign on the Prototypical alpha Cygni Variable and A-type Supergiant Star Deneb
- Mixing of CNO-cycled matter in massive stars
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- Asteroseismology of the Nearby SN-II Progenitor Rigel Part II. ε-Mechanism Triggering Gravity-Mode Pulsations?
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- Variability survey of brightest stars in selected OB associations
- An Observational Evaluation of Magnetic Confinement in the Winds of BA Supergiants
- Massive Star Asteroseismology in Action
- The variable stellar wind of Rigel probed at high spatial and spectral resolution
- Combining observational techniques to constrain convection in evolved massive star models
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