Photospheric Ca and Mg line-strength variations in G29-38
نویسندگان
چکیده
منابع مشابه
Discovery of Photospheric Calcium Line-Strength Variations in the Dazd White Dwarf G29-38
Metals in the photospheres of white dwarfs with TeA between 12,000 and 25,000 K should gravitationally settle out of these atmospheres in 1Y2 weeks. Temporal variations in the line strengths of these metals could provide a direct measurement of episodic metal accretion. Using archival VLTand Keck spectroscopy, we find evidence that the DAZd white dwarf G29-38 shows significant changes in its Ca...
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B. D. Anderson, 1 A. R. Baldwin, 1 P. Baumann, 2 B. A. Brown, 3 F. Didierjean, 2,* C. C. Foster, 4 L. A. C. Garcia, 1,† A. Huck, 2 A. Knipper, 2 R. Madey, 1,5 D. M. Manley, 1 G. Marguier, 6 M. Ramdhane, 2,‡ H. Ravn, 7 C. Richard-Serre, 8 G. Walter, 2 and J. W. Watson 1 Department of Physics and Center for Nuclear Research, Kent State University, Kent, Ohio 44242 Centre de Recherches Nucléaires,...
متن کاملar X iv : a st ro - p h / 07 02 66 3 v 1 2 5 Fe b 20 07 Discovery of Photospheric Calcium Line Strength Variations in the DAZd White Dwarf G 29 - 38
Metals in the photospheres of white dwarfs with Teff between 12,000 and 25,000 K should gravitationally settle out of these atmospheres in 1–2 weeks. Temporal variations in the line strengths of these metals could provide a direct measurement of episodic metal accretion. Using archival VLT and Keck spectroscopy, we find evidence that the DAZd white dwarf G29-38 shows significant changes in its ...
متن کاملX iv : a st ro - p h / 07 02 66 3 v 1 2 5 Fe b 20 07 Discovery of Photospheric Calcium Line Strength Variations in the DAZd White Dwarf G 29 - 38
Metals in the photospheres of white dwarfs with Teff between 12,000 and 25,000 K should gravitationally settle out of these atmospheres in 1–2 weeks. Temporal variations in the line strengths of these metals could provide a direct measurement of episodic metal accretion. Using archival VLT and Keck spectroscopy, we find evidence that the DAZd white dwarf G29-38 shows significant changes in its ...
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UNLABELLED The dynamic loading in human body, along with the corrosive body fluid, presents a great challenge for the practical use of biodegradable magnesium implants. In this study, a high purity magnesium (99.99wt.%) and two typical promising biodegradable magnesium alloys (binary Mg-1Ca and ternary Mg-2Zn-0.2Ca) were chosen as the experimental materials. Their dynamic mechanical performance...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2009
ISSN: 1742-6596
DOI: 10.1088/1742-6596/172/1/012059