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D.R. Bates 《Planetary and Space Science》1974,22(8):1268
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N. D. Melikian V. S. Tamazian A. A. Karapetian A. L. Samsonian G. R. Kostandian 《Astrophysics》2011,54(2):203-213
A search for Hα objects in four fields with an overall area of about 0.14 square degrees in the region of NGC 6910 (the core
of the known Cyg OB9 association) has led to the discovery of 64 emission stars, of which 49 are newly detected. The high
surface density is indicative of a very rich T association or, possibly, of the projection of several T associations onto
one another in this direction. The latter possibility is also indicated by the range of the R photometric stellar magnitudes
of the emission stars, 9m.68-19m.42. A comparison with earlier observations shows that for many of the stars, the emission line intensity is variable. A P
Cyg Hα line profile is recorded for the star V 1515 Cyg with an emission component equivalent width that greatly exceeds the
equivalent absorption width. 相似文献
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D. B. Melrose 《Astrophysics and Space Science》1979,64(1):45-48
In their discussion of the transfer of polarized radiation in a weakly anisotropic, weakly inhomogeneous plasma, Cheng and Fung (1977) have included terms which describe the effects of mode coupling and of the variation of the characteristic polarizations. The latter effect is nonphysical, and only the mode-coupling term should be retained. As the problem was formulated by Cheng and Fung, the two terms would cancel exactly; consequently, when corrected, the work of Cheng and Fung leads to a simple and useful method of including the effects of mode coupling in the weak anisotropy limit.On leave from Department of Theoretical Physics, Faculty of Science, Australian National University. 相似文献
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Preliminary results from a search for emission stars in the neighborhood of Cyg OB7 are reported. A new region of size 14×14
arc min lies 12 arc min to the south of HH 448. 17 new objects have been found, of which one is related to a nebula with an
interesting shape and, apparently, the characteristics of a cometary nebula. Inside the nebula there are 4 faint, compact
formations with very high proper motions. The spectrum of a star shows that it is of spectral class K9-M0 and is a T Tau type
star at a distance of 220 pc. Most of the discovered stars with a strong or intermediate Ha emission line intensity are presumably
also T Tau stars. This region appears to be a continuation of the T association around HH 448. 相似文献
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Abstract— We discuss possible evidence for a dilution of 14C caused by the Tunguska impact event, proposed by Rasmussen et al. (1999). The results presented in that paper and other available information do not support this hypothesis. 相似文献
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NLTE calculations of carbon abundance in Peg atmosphere revealed a slight deficiency of this element ([C/H] =–0.25). A short discussion of this result is given. The list of CII that could be used for LTE calculation of carbon abundance in hot stars is presented. 相似文献
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