منابع مشابه
Stellar Radio Astrophysics
Radio emission has been detected from all the stages of stellar evolution across the HR Diagram. Its presence reveals both astrophysical phenomena and stellar activity which, otherwise, would not be detectable by other means. The development of large, sensitive interferometers has allowed us to resolve the radio structure of several stellar systems, providing insights into the mass transfer pro...
متن کاملApplications of Microlensing to Stellar Astrophysics
Over the past decade, microlensing has developed into a powerful tool to study stellar astrophysics, especially stellar atmospheres, stellar masses, and binarity. I review this progress. Stellar atmospheres can be probed whenever the source in a microlensing event passes over the caustic (contour of infinite magnification) induced by the lens because the caustic effectively resolves the source....
متن کاملForecasting Seismic Signatures of Stellar Magnetic Activity
For the Sun, a tight correlation between various activity measures and oscillation frequencies is well documented. For other stars, we have abundant data on magnetic activity and its changes but not yet on its seismic signature. A prediction of the activity induced frequency changes in stars based on scaling the solar relations is presented. This seismic signature of the activity should be meas...
متن کاملAccretion Signatures from Massive Young Stellar Objects
High resolution (λ/∆λ = 50,000) K−band spectra of massive, embedded, young stellar objects are presented. The present sample consists of four massive young stars located in nascent clusters powering Galactic giant H II regions. Emission in the 2.3 μm 2–0 vibrational–rotational bandhead of CO is observed. A range of velocity broadened profiles seen in three of the objects is consistent with the ...
متن کاملSignatures of Stellar Reionization of the Universe
The high ionization level and non-zero metallicity (∼ 1% Z ⊙) of the intergalactic gas at redshifts z ∼ < 5 implies that nonlinear structure had started to form in the universe at earlier times than we currently probe. In Cold Dark Matter (CDM) cosmologies, the first generation of baryonic objects emerges at redshifts z ∼ 10–50. Here we examine the observable consequences of the possibility tha...
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ژورنال
عنوان ژورنال: Science
سال: 2002
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.295.5563.2179e