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CoRoT's view of newly discovered B-star pulsators: results for 358 candidate B pulsators from the initial run's exoplanet field data
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, 2009, 506, pp.471-489. ⟨10.1051/0004-6361/200911884⟩, Astronomy & Astrophysics, 506, 471-489, Astronomy & Astrophysics, 506, 1, pp. 471-489, Astronomy and Astrophysics
- Publication Year :
- 2009
-
Abstract
- We search for new variable B-type pulsators in the CoRoT data assembled primarily for planet detection, as part of CoRoT's Additional Programme. We aim to explore the properties of newly discovered B-type pulsators from the uninterrupted CoRoT space-based photometry and to compare them with known members of the Beta Cep and slowly pulsating B star (SPB) classes. We developed automated data analysis tools that include algorithms for jump correction, light-curve detrending, frequency detection, frequency combination search, and for frequency and period spacing searches. Besides numerous new, classical, slowly pulsating B stars, we find evidence for a new class of low-amplitude B-type pulsators between the SPB and Delta Sct instability strips, with a very broad range of frequencies and low amplitudes, as well as several slowly pulsating B stars with residual excess power at frequencies typically a factor three above their expected g-mode frequencies. The frequency data we obtained for numerous new B-type pulsators represent an appropriate starting point for further theoretical analyses of these stars, once their effective temperature, gravity, rotation velocity, and abundances will be derived spectroscopically in the framework of an ongoing FLAMES survey at the VLT.<br />Comment: 22 pages, 30 figures, accepted for publication in A&A
- Subjects :
- oscillations [stars]
spaced data
opacity mechanism
Astronomy
FOS: Physical sciences
Astrophysics
Star (graph theory)
01 natural sciences
Instability
nyquist frequency
effective temperature
variable-stars
Planet
beta-cephei stars
pulsational frequency-analysis
0103 physical sciences
data analysis [methods]
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
Solar and Stellar Astrophysics (astro-ph.SR)
Physics
010308 nuclear & particles physics
time-series
photometric-observations
Astronomy and Astrophysics
Effective temperature
Exoplanet
Photometry (astronomy)
Stars
Amplitude
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
variables: general [stars]
order g-modes
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING
Astrophysics::Earth and Planetary Astrophysics
Astrophysics - Instrumentation and Methods for Astrophysics
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Subjects
Details
- ISSN :
- 00046361
- Volume :
- 506
- Database :
- OpenAIRE
- Journal :
- Astronomy & Astrophysics
- Accession number :
- edsair.doi.dedup.....8dda338014114fcd160618be43d21073