Bp stars in Orion OB1 association
نویسندگان
چکیده
منابع مشابه
The Low Mass Stellar Population of the Orion Ob1 Association and Implications for the Formation of Low Mass Stars
The OB associations, which are fossil star formation regions, retain the endproducts of the star formation process in an open, unobscured environment. Observations of the low mass stars in OB associations provide a far clearer picture of the results of the star formation process than do observations of embedded, on-going star formation regions. We review the X–ray and optical surveys of the fos...
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Ap/Bp stars are magnetic chemically peculiar early A and late B type stars of the main sequence. They exhibit peculiar surface abundance anomalies that are thought to be the result of gravitational settling and radiative levitation. The physics of diffusion in these stars are reviewed briefly and some model predictions are discussed. While models reproduce some observations reasonably well, mor...
متن کاملThe Orion OB 1 association ⋆
Walraven photometry of established and probable members of the Orion OB1 association is presented. Effective temperature, surface gravity, luminosity and mass are derived for all stars, using atmosphere models by Kurucz (1979). Absolute magnitudes are calculated using the Straižys and Kuriliene (1981) tables. Distance mod-uli and visual extinctions are determined. A comparison of the visual ext...
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We review the current knowledge of the population of ‘older’ stars in the Orion OB1 association, specifically those in subgroups 1a and 1b. We briefly outline the history of the subject and then continue with a summary of the present state of knowledge of the early-type stars in Orion OB1. New results from the Hipparcos parallaxes and proper motions will be presented. The main result is that su...
متن کاملar X iv : a st ro - p h / 99 05 23 3 v 1 1 8 M ay 1 99 9 Three very young HgMn stars in the Orion OB 1 Association
We report the detection of three mercury-manganese stars in the Orion OB1 association. HD 37886 and BD–0 • 984 are in the approximately 1.7 million year old Orion OB1b. HD 37492 is in the approximately 4.6 million year old Orion OB1c. Orion OB1b is now the youngest cluster with known HgMn star members. This places an observational upper limit on the time scale needed to produce the chemical pec...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2013
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921314002270