Spectroscopic Parallaxes of the Hotter Stars. (Preliminary Paper.)
نویسندگان
چکیده
منابع مشابه
On the Hipparcos parallaxes of O stars
We compare the absolute visual magnitude of the majority of bright O stars in the sky as predicted from their spectral type with the absolute magnitude calculated from their apparent magnitude and the Hipparcos parallax. We find that many stars appear to be much fainter than expected, up to five magnitudes. We find no evidence for a correlation between magnitude differences and the stellar rota...
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Hipparcos parallaxes give new tests of the nature of δ Sct variables. For many individual stars accurate distances are now available, i.e. directly determined luminosities and radii can be used to test theoretical models. Of particular interest are the at present very unclear relations between high–amplitude δ Sct stars and the much more abundant low–amplitude δ Sct variables, and the relations...
متن کاملThe absolute magnitudes of RR Lyrae stars from HIPPARCOS parallaxes ?
Using the method of “reduced parallaxes” for the Halo RR Lyrae stars in the hipparcos catalogue we derive a zero point of 0.77 ± 0.26 mag for an assumed slope of 0.18 in the MV-[Fe/H] relation. This is 0.28 magnitude brighter than the value Fernley et al. (1998a) derived by employing the method of statistical parallax for the identical sample and using the same slope. We point out that a simila...
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Wediscuss some consequences for the determination of the surface gravity parameter of very metal-poor halo dwarfs in the new light shed upon these objects from the Hipparcos astrometry. Whereas it has become clear that standard spectroscopic LTE iron ionization equilibria are prone to systematic errors, in the sense, that stages of evolution are predicted that are actually not yet reached, the ...
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We present absolute parallaxes and relative proper motions for five AM CVn stars, which we obtained using the Fine Guidance Sensors on board the Hubble Space Telescope. Our parallax measurements translate into distances dAMCVn = 606 +135 −93 pc; dHPLib = 197 +14 −12 pc; dCRBoo = 337 +44 −35 pc; dV803Cen = 347 +32 −27 pc; and dGPCom = 75 +2 −2 pc. From these distances we estimate the space densi...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1922
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/83.1.47