Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And
We have studied three binary stellar systems KR Cyg, V382 Cyg and BX And, which are eclipsing variables of the β Lyrae - type. We have studied the phase curves and O-C curves. The forms of their O-C curves are sinusoidal with a trend, so we made the conclusion that the periods of binary systems chan...
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| Published in: | Advances in Astronomy and Space Physics |
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| Date: | 2015 |
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| Format: | Article |
| Language: | English |
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Головна астрономічна обсерваторія НАН України
2015
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/119935 |
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| Cite this: | Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And / D.E. Tvardovskyi, V.I. Marsakova // Advances in Astronomy and Space Physics. — 2015. — Т. 5., вип. 2. — С. 75-78. — Бібліогр.: 12 назв. — англ. |
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Tvardovskyi, D.E. Marsakova, V.I. 2017-06-10T12:05:07Z 2017-06-10T12:05:07Z 2015 Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And / D.E. Tvardovskyi, V.I. Marsakova // Advances in Astronomy and Space Physics. — 2015. — Т. 5., вип. 2. — С. 75-78. — Бібліогр.: 12 назв. — англ. 2227-1481 DOI:10.17721/2227-1481.5.75-78 https://nasplib.isofts.kiev.ua/handle/123456789/119935 We have studied three binary stellar systems KR Cyg, V382 Cyg and BX And, which are eclipsing variables of the β Lyrae - type. We have studied the phase curves and O-C curves. The forms of their O-C curves are sinusoidal with a trend, so we made the conclusion that the periods of binary systems change periodically and we suppose that the systems have third components that do not take part in the eclipses, but produce a periodic "light time" effect, as the inner eclipsing binary rotates around the common centre of masses of the triple system. For the analysis, we used data published in the AAVSO and NSVS databases, as well as our own observations. For the O-C curves, the data were taken from the BRNO database, as well as from our own calculations of the moments of minima from the light curves. We determined secondary periods, calculated the minimal masses of the third components, estimated the mass transfer rate for the system V382 Cyg and corrected the ephemeris for these three eclipsing variables. We sincerely thank all members of AAVSO and BRNO communities for their work that made this researches possible. We also grateful to the NSVS project for their observations. The thank Ivan L. Andronov for helpful discussions. We express special thanks to the organizers of the Astrocamp "Variable-2015" and especially to Pavol A. Dubovsky for helpful training in obtaining CCD-observations. en Головна астрономічна обсерваторія НАН України Advances in Astronomy and Space Physics Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And Article published earlier |
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DSpace DC |
| title |
Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And |
| spellingShingle |
Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And Tvardovskyi, D.E. Marsakova, V.I. |
| title_short |
Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And |
| title_full |
Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And |
| title_fullStr |
Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And |
| title_full_unstemmed |
Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And |
| title_sort |
cyclic period changes of β lyrae-type eclipsing variable stars kr cyg, v382 cyg and bx and |
| author |
Tvardovskyi, D.E. Marsakova, V.I. |
| author_facet |
Tvardovskyi, D.E. Marsakova, V.I. |
| publishDate |
2015 |
| language |
English |
| container_title |
Advances in Astronomy and Space Physics |
| publisher |
Головна астрономічна обсерваторія НАН України |
| format |
Article |
| description |
We have studied three binary stellar systems KR Cyg, V382 Cyg and BX And, which are eclipsing variables of the β Lyrae - type. We have studied the phase curves and O-C curves. The forms of their O-C curves are sinusoidal with a trend, so we made the conclusion that the periods of binary systems change periodically and we suppose that
the systems have third components that do not take part in the eclipses, but produce a periodic "light time" effect, as the inner eclipsing binary rotates around the common centre of masses of the triple system. For the analysis, we used data published in the AAVSO and NSVS databases, as well as our own observations. For the O-C curves, the data were taken from the BRNO database, as well as from our own calculations of the moments of minima from the light curves. We determined secondary periods, calculated the minimal masses of the third components, estimated the mass transfer rate for the system V382 Cyg and corrected the ephemeris for these three eclipsing variables.
|
| issn |
2227-1481 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/119935 |
| citation_txt |
Cyclic Period Changes of β Lyrae-type Eclipsing Variable Stars KR Cyg, V382 Cyg and BX And / D.E. Tvardovskyi, V.I. Marsakova // Advances in Astronomy and Space Physics. — 2015. — Т. 5., вип. 2. — С. 75-78. — Бібліогр.: 12 назв. — англ. |
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AT tvardovskyide cyclicperiodchangesofβlyraetypeeclipsingvariablestarskrcygv382cygandbxand AT marsakovavi cyclicperiodchangesofβlyraetypeeclipsingvariablestarskrcygv382cygandbxand |
| first_indexed |
2025-12-07T19:26:12Z |
| last_indexed |
2025-12-07T19:26:12Z |
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