3篇
您的检索式：作者名="Jan Martin Winters"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Plaque Instability Frequently Occurs Days or Weeks Before Occlusive Coronary Thrombosis: A Pathological Thrombectomy Study in Primary Percutaneous Coronary Intervention显示文摘 | Saskia Z.H. Rittersma Allard C. van der Wal Karel T. Koch Jan J. Piek José P.S. Henriques Karla J. Mulder Johanna P.H.M. Ploegmakers Martin Meesterman Robbert J. de Winter | 2005 | Circulation2005，，： | 1 |
| 2 | On the central symmetry of the circumstellar envelope of RS Cnc显示文摘We present a phenomenological study of CO(1–0) and CO(2–1) emission from the circumstellar envelope(CSE) of the Asymptotic Giant Branch(AGB) star RS Cnc. It reveals departures from central symmetry that turn out to be efficient tools for the exploration of some of the properties of the CSE. We use a wind model including a bipolar flow with a typical wind velocity of ~8 km s-1that decreases to~2 km s-1near the equator. This wind model is used to describe Doppler velocity spectral maps obtained by merging data collected at the IRAM Plateau de Bure Interferometer and Pico Veleta single dish radio telescope. Parameters describing the wind morphology and kinematics are obtained, together with the radial dependence of the gas temperature in the domain of the CSE probed by the CO observations.Significant north-south central asymmetries are revealed by the analysis, which we quantify using a simple phenomenological description. The origin of such asymmetries is unclear. | Pham Tuyet Nhung Do Thi Hoai Jan Martin Winters Pierre Darriulat Eric Grard Thibaut Le Bertre | 2015 | Research in Astronomy and Astrophysics2015，15，5： | 0 |
| 3 | ALMA observations of the circumstellar envelope around EP Aqr显示文摘Atacama Large Millimetre/sub-millimetre Array(ALMA) observations of CO(1–0) and CO(2–1) emissions from the circumstellar envelope of the asymptotic giant branch(AGB) star EP Aqr have been made with four times better spatial resolution than previously available. They are analysed with emphasis on the de-projection in space of the effective emissivity and flux of matter using as input a prescribed configuration of the velocity field, assumed to be radial. The data are found to display an intrinsic axisymmetry with respect to an axis making a small angle with respect to the line of sight. A broad range of wind configurations, from prolate(bipolar) to oblate(equatorial) has been studied and found to be accompanied by significant equatorial emission. Qualitatively, the effective emissivity is enhanced near the equator to produce the central narrow component observed in the Doppler velocity spectra and its dependence on star latitude generally follows that of the wind velocity with the exception of an omni-present depression near the poles. In particular, large equatorial expansion velocities produce a flared disc or a ring of effective emissivity and mass loss. The effect on the determination of the orientation of the star axis of radial velocity gradients, and possibly competing rotation and expansion in the equatorial disc, is discussed. In general,the flux of matter is found to reach a broad maximum at distances of the order of 500 AU from the star.Arguments are given that may be used to favour one wind velocity distribution over another. As a result of the improved quality of the data, a deeper understanding of the constraints imposed on morphology and kinematics has been obtained. | Pham Thi Tuyet Nhung Do Thi Hoai Pham Tuan-Anh Thibaut Le Bertre Pierre Darriulat Pham Ngoc Diep Nguyen Thi Phuong Nguyen Thi Thao Jan Martin Winters | 2019 | Research in Astronomy and Astrophysics2019，19，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员