White Dwarfs are Small, Fast-Spinning Hot Stars
نویسندگان
چکیده
منابع مشابه
Circumstellar features in hot DA white dwarfs
We present a phenomenological study of highly ionised, non-photospheric absorption features in high spectral resolution vacuum ultraviolet spectra of 23 hot DA white dwarfs. Prior to this study, four of the survey objects (Feige 24, REJ 0457-281, G191B2B and REJ 1614-085) were known to possess these features. We find four new objects with multiple components in one or more of the principal reso...
متن کاملFUSE observations of hot white dwarfs
We have analyzed FUSE observations of six hot white dwarf stars: four DA white dwarfs with Teff >∼ 45 000 K, the DAO Feige 55 (Teff ≈ 55 000 K), and the DA CD−38◦ 10980 (Teff ≈ 24 000 K). Photospheric lines from Si IV, PV, and S VI can be observed in the majority of the five hotter objects. Feige 55 shows also several other heavier elements. The measured abundances agree only partly with the pr...
متن کاملMetal Abundances in Hot DA White Dwarfs
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.
متن کاملCool Companions to Hot White Dwarfs
Low-mass companions to high-mass stars are difficult to detect, which is partly why the binary fraction for high-mass stars is still poorly constrained. Low-mass companions can be detected more easily however, once high-mass stars turn into white dwarfs. These systems are also interesting as the progenitors of a variety of intensely studied interacting binary systems, like novae, CVs, symbiotic...
متن کاملPhotospheric metals in hot DA white dwarfs
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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ژورنال
عنوان ژورنال: International Journal of Sciences
سال: 2019
ISSN: 2305-3925,2410-4477
DOI: 10.18483/ijsci.2177