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Alania, I.Ph. and ალანია, ი. and Алания, И.Ф. (1968) Spectrophotometric Gradients of AC Her. / ვარსკვლავის ჰერკულესის AC სპექტროფოტომტრიული გრადიენტები / Спектрофотометрические градиенты звезды AC Геркулеса. აბასთუმნის ასტროფიზიკური ობსერვატორიის ბიულეტენი / Bulletin of the Abastumani Astrophysical Observatory (36). pp. 3-16.
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Abstract
The spectropholometric gradients of AC Her In 23 phases of brightness are determined and a curve of gradient variations is drawn on the base of the objective-prism spectra obtained with the 70-cm meniscus telescope of the Abastumani observatory. Colour temperature of this variable varies in the range of 4900— 6900°. At the same time the maximum of temperature coincides with the secondary maximum of the gradient variation curve. The spectral class, determined by CA' and C// absorption band intensities. varies from F2 to G5. In the secondary maximum of light the value of colour temperature agrees well with effective temperature of the normal supergiants of type F2, while in the minimum there is a considerable difference. The gradient curve and the colour curve A (B—V) scarcely show any relative displacement. The spectra related to the light curve part raising from tho deep minimum are discussed and it is suggested that in the atmosphere of this variable the hydrogen ionization maximum moment precedes that of the colour temperature primary maximum.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Institutes > Evgeny Kharadze Abastumani National Astrophysical Observatory |
| Depositing User: | თამარ ჭაღიაშვილი |
| Date Deposited: | 23 Jul 2018 13:49 |
| Last Modified: | 23 Jul 2018 13:49 |
| URI: | http://eprints.iliauni.edu.ge/id/eprint/8335 |
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