A comprehensive study of young B stars in NGC 2264 I. Space photometry and asteroseismology
| Autor: | Luca Fossati, Ehsan Moravveji, Norbert Przybilla, Konstanze Zwintz, Andrew Tkachenko, Victoria Antoci, Thomas G. Barnes, M.-F. Nieva, D. Lorenz, Rainer Kuschnig, Péter Pápics, N. Themessl |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
oscillations [stars]
GAMMA DORADUS STARS Be star FOS: Physical sciences STELLAR ASTROPHYSICS MESA Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics asteroseismology ROTATING STARS 01 natural sciences Asteroseismology ANGULAR-DEPENDENCE early-type [stars] Photometry (optics) photometric [techniques] GRAVITY MODES 0103 physical sciences Cluster (physics) ORDER G-MODES Astrophysics::Solar and Stellar Astrophysics PRESUPERNOVA EVOLUTION 010303 astronomy & astrophysics Stellar evolution Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics general [stars] Astronomy and Astrophysics Light curve INTERNAL-ROTATION Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science INTERMEDIATE-MASS STARS Astrophysics::Earth and Planetary Astrophysics MAIN-SEQUENCE STARS Open cluster |
| Zdroj: | Zwintz, K, Moravveji, E, Papics, P I, Tkachenko, A, Przybilla, N, Nieva, M-F, Kuschnig, R, Antoci, V, Lorenz, D, Themessl, N, Fossati, L & Barnes, T G 2017, ' A comprehensive study of young B stars in NGC 2264 I. Space photometry and asteroseismology ', Astronomy & Astrophysics, vol. 601, 101 . https://doi.org/10.1051/0004-6361/201630327 |
| DOI: | 10.1051/0004-6361/201630327 |
| Popis: | Space photometric time series of the most massive members of the young open cluster NGC 2264 allow us to study their different sources of variability down to the millimagnitude level and permits a search for Slowly Pulsating B (SPB) type pulsation among objects that are only a few million years old. Our goal is to conduct a homogeneous study of young B type stars in the cluster NGC 2264 using photometric time series from space in combination with high-resolution spectroscopy and spectropolarimetry obtained from the ground. The latter will be presented in a separate follow-up article. We performed frequency analyses for eleven B stars in the field of the young cluster NGC 2264 using photometric time series from the MOST, CoRoT and Spitzer space telescopes and the routines Period04 and SigSpec. We employ the MESA stellar evolution code in combination with the oscillation code GYRE to identify the pulsation modes for two SPB stars which exhibit short period spacing series. From our analysis we identify four objects that show SPB pulsations, five stars that show rotational modulation of their light curves caused by spots, one star that is identified to be a binary, and one object in the field of the cluster that is found to be a non-member Be star. In two SPB stars we detect a number of regularly spaced pulsation modes that are compatible with being members of a g mode period series. Despite NGC 2264's young age, our analysis illustrates that its B type members have already arrived on the zero-age main sequence (ZAMS). Our asteroseismic analysis yields masses between 4 and 6 Msun and ages between 1 and 6 million years, which agree well to the overall cluster age. 19 pages, 20 figures, accepted for publication in Astronomy & Astrophysics |
| Databáze: | OpenAIRE |
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