Shain, P.Th. და შაინი, პ. (1943) Some Physical Characteristics of the Atmospheres of Supergiants cB5 - cA5 / cB5 - cA5 ტიპის ზებუმბერაზ ვარსკვლავთა ატმოსფეროს ზოგიერთი ფიზიკური მახასიათებელი. აბასთუმნის ასტროფიზიკური ობსერვატორიის ბიულეტენი / Bulletin of the Abastumani Astrophysical Observatory (7). С. 83-98.
|
ტექსტი
1943-4.pdf Download (23MB) | გადახედვა |
რეზიუმე
It is worthy of attention that at certain stages the spectra of Novae manifest a striking resemblance to those of Wolf-Rayet, P Cygni and c-stars. Since long time the study of new stars led to the conclusion that there undoubtedly takes place an ejection of high speed atoms. Further in the last years the emission bands of NV-R stars have been also successfully interpreted in terms of the continuous ejection of matter. The third type of objects where the ejection hypothesis found serious support are the P Cygni stars- But such evidences arc lacking with regard to c-stars. As to the Be stars the observe: facts are very difficult for interpretation, but in several cases there are indications on the formation of tenuous shells. The purpose of the present paper, which represents an account of a more detailed investigation, consists in the search tor more direct evidences in favour of the hypothesis of outward streaming of matter in the atmospheres of supergiants of early type. The investigation was done on following lines: 1) The estimate of the effective gravity acceleration from the study of the Stark effect for hydrogen lines and of the relative intensities of spectral lines of neutral and ionized atoms. 2) The study of radial velocities of several individual lines showing systematic displacements. 3) The investigation of the systematic motion of c-stars having mainly in view the derivation of the constant term K. We have brought above a number of independent evidences of spectroscopic and dynamical character in favour of the hypothesis that in the atmospheres of supergiants B5 - A3 there are operative in addition to the gas pressure also other forces acting against the gravitation. This leads to the very high discrepancy between the effective and dynamical value of gravity acceleration, and on the other hand, to the outward streaming of matter displaying itself in the existence of the negative K-term and the systematic displacement of Ca II lines. Semeis-Abastumani September, 1942
| ობიექტის ტიპი: | სტატია |
|---|---|
| თემატიკა: | Q Science > QB Astronomy |
| ქვეგანყოფილება: | Institutes > Evgeny Kharadze Abastumani National Astrophysical Observatory |
| განმათავსებელი მომხმარებელი: | თამარ ჭაღიაშვილი |
| განთავსების თარიღი: | 25 მაისი 2018 10:15 |
| ბოლო ცვლილება: | 25 მაისი 2018 10:15 |
| URI: | http://eprints.iliauni.edu.ge/id/eprint/8002 |
Actions (login required)
 |
ობიექტის ნახვა |
