Search forp-mode oscillations in DA white dwarfs with VLT-ULTRACAM
نویسندگان
چکیده
منابع مشابه
Observations of Ultracool dwarfs with ultracam on the vlt: a search for weather
We present multi-colour photometry of four field ultracool dwarfs with the triple-beam photometer ultracam. Data were obtained simultaneously in the Sloan-g band and a specially designed narrow-band NaI filter. The previously reported 1.8-hr period of Kelu-1 is here recovered in the g-band, but the lack of any significant variability in the NaI light of this object precludes any conclusion as t...
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Previous observations of the soft X-ray and EUV region with the Einstein, EXOSAT, and ROSAT satellites have indicated thepresenceof photospheric absorbers inmostDAwhite dwarfs with Teff >∼ 40000K. Several of these objects have now been observed with the Extreme Ultraviolet Explorer (EUVE). Since the detection of individual metal lines is rather difficult with EUVE spectra we chose the well stud...
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We compare measured element abundances in hot DA white dwarfs from UV observations to predictions from our self-consistent non-LTE model atmosphere diffusion calculations.
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For the last three years we have performed a survey for young (< 3 Gyrs) giant planets around nearby white dwarfs with HST, Spitzer, and VLT. Direct HST/NICMOS imaging of the seven white dwarfs in the Hyades gave no evidence for companions down to about 10 Jupiter masses and separations larger than 0.5 arcsec (∼ 25 AU), while VLT/NACO observations revealed a putative companion to a field white ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2010
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201015334