Tag: Stelle B

From the Gaia-ESO Survey, the analysis of the rotational velocity of the B stars in 8 stellar clusters of the Carena Complex presented in “The Gaia-ESO Survey: projected rotational velocities of B stars in the Carina Nebula” of W Santos (Observatorio Nacional MCTI, Brazil)

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Rotation velocities measured for 330 B-type stars in eight stellar clusters of the Carina complex, thanks to the Gaia-ESO Survey.   Stars rotate on their axes. Some, such as young stars, spin very rapidly, with rotation periods as short as one or two days. In other cases, like red giant stars, rotation is much slower, with periods lasting several months.

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INAF-OAPA researchers observe for the first time X-ray emission from an active region in a B star

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The study of the X-ray emission from stars provides an unmatched view of those energetic phenomena occurring in stars. In massive stars (O and early B stars), soft X-ray photons (less energetic than about 1 keV) are emitted from shocks in stellar winds. More energetic photons (the hard X-ray emission) is due to colliding stellar winds in binary systems or

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Osservata per la prima volta emissione ai raggi X associata ad una regione attiva in una stella B. Pubblicato su A&A lo studio: “Detection of magnetic field in the B2 star ρ Ophiuchi A with ESO FORS2” di I. Pillitteri (INAF-OAPA)

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di Mario Giuseppe Guarcello    ( segui mguarce)     Lo studio dell’emissione di raggi X dalle stelle offre molte diagnostiche di fenomeni stellari ad alta energia. Nelle stelle massive (di classe spettrale O le B più calde) raggi X “soffici” (con energia generalmente minore di 1keV, corrispondente a temperature minori di 10 milioni di gradi) sono emessi in shock nei

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