Rotational velocity distributions of A-type stars
نویسندگان
چکیده
منابع مشابه
Rotational velocities of A - type stars ⋆ III . Velocity distributions
Aims. In this work, a sample of v sin i of B9 to F2-type main sequence single stars has been built from highly homogeneous v sin i parameters determined for a large sample cleansed from objects presenting the Am and Ap phenomenon as well as from all known binaries. The aim is to study the distributions of rotational velocities in the mass range of A-type stars for normal single objects. Methods...
متن کاملRotational velocities of A - type stars ⋆ , ⋆ ⋆
Within the scope of a Key Programme determining fundamental parameters of stars observed by HIPPARCOS, spectra of 525 B8 to F2-type stars brighter than V = 8 have been collected at ESO. Fourier transforms of several line profiles in the range 4200–4500 Å are used to derive v sin i from the frequency of the first zero. Statistical analysis of the sample indicates that measurement error is a func...
متن کاملThe VLT-FLAMES survey of massive stars: atmospheric parameters and rotational velocity distributions for B-type stars in the Magellanic Clouds⋆
Aims. We aim to provide atmospheric parameters and rotational velocities of a large sample of Oand early B-type stars, analysed in a homogeneous and consistent manner, for use in constraining theoretical models. Methods. Atmospheric parameters, stellar masses and rotational velocities have been estimated for approximately 250 early B-type stars in the Large (LMC) and Small (SMC) Magellanic Clou...
متن کاملSpace and Velocity Distributions of Galactic Isolated Old Neutron Stars
I present the results of Monte Carlo orbital simulations of Galactic Neutron Stars (NSs). The simulations take into account the up-to-date observed NS space and velocity distributions at birth, and account for their formation rate. I simulate two populations of NSs. NSs in the first population were born in the Galactic disk at a constant rate, in the past 12 Gyr. Those in the second population ...
متن کاملSingle massive stars at the critical rotational velocity: possible links with Be and B[e] stars
Using single star models including the effects of shellular rotation with and without magnetic fields, we show that massive stars at solar metallicity with initial masses lower than about 20-25 M⊙ and with an initial rotation above ∼ 350 km s likely reach the critical velocity during their Main-Sequence phase. This results from the efficient outwards transport of angular momentum by the meridio...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2004
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921304004442