The Ultramassive White Dwarf EUVE J1746−706
نویسندگان
چکیده
منابع مشابه
Temperature determination of the cool DO white dwarf HD149499B from EUVE observations
We present a LTE model atmosphere analysis of the EUVE medium and long wavelength spectrum of the cool DO white dwarf HD149499B. This observation in the spectral range 230-700 Å supplements a previous analysis of an ORFEUS spectrum between 912 and 1170 Å which yielded the atmospheric parameters Teff = 49500±500K and log g = 7.97± 0.08 and a hydrogen-to-helium number ratio of 0.22 ± 0.11. The EU...
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Fig. 3. A solution to the ROSAT WFC is found in the range 26; 000 Te 36; 000 K and a solution to the EUVE count rates is found near 27; 000 Te 31; 000 K assuming pure hydrogen models. ant branch, and eventually the asymptotic giant branch. Because of the large orbital separation, evolution occurs without any signicant interaction with the companion. The second component, following its companion...
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astrophysics is becoming now an integral part of general physics. considering the black hole theory ,which is a new and exciting branch of relativistic astrophysics, we see many connections between elementary particle physics and astrophysics. in this article we attempt to explain the development of star physics ,in an easy ,understandable manner. previous knowledge of relativistic theory or cl...
متن کاملar X iv : a st ro - p h / 96 11 18 1 v 2 2 2 N ov 1 99 6 The Ultramassive White Dwarf
We have obtained new optical and extreme ultraviolet (EUV) spectroscopy of the ultramassive white dwarf EUVE J1746–706. We revise Vennes et al.’s (1996a, ApJ, 467, 784) original estimates of the atmospheric parameters and we measure an effective temperature of 46, 500± 700 K and a surface gravity log g = 9.05± 0.15 (∼ 1.2M⊙), in agreement with Balmer line profiles and the EUV continuum. We deri...
متن کاملar X iv : a st ro - p h / 96 11 18 1 v 1 2 1 N ov 1 99 6
We have obtained new optical and extreme ultraviolet (EUV) spectroscopy of the ultramassive white dwarf EUVE J1746–706. We revise Vennes et al.’s (1996a, ApJ, 467, 784) original estimates of the atmospheric parameters and we measure an effective temperature of 46, 500± 700 K and a surface gravity log g = 9.05± 0.15 (∼ 1.2M⊙), in agreement with Balmer line profiles and the EUV continuum. We deri...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1997
ISSN: 0004-637X
DOI: 10.1086/310482