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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2604.21440 |
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| _version_ | 1866908989270261760 |
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| author | Zamanov, R. Dankova, L. Minev, M. Boneva, D. Yankova, K. |
| author_facet | Zamanov, R. Dankova, L. Minev, M. Boneva, D. Yankova, K. |
| contents | We present optical B and V band photometry of GP Com - an ultracompact binary consisting of an accreting white dwarf and helium secondary component. Our data set contains 7.7 hours observations in V band with the 2.0m telescope and 2.9 hours simultaneous observations in B and V bands with the 1.5m telescope of the Rozhen National Astronomical Obsevatory, Bulgaria. The observations cover of about 13 orbital periods.
We find an orbital modulation with amplitude 0.04-0.05 mag in B and V bands. Adopting that it is due to a bright spot, we estimate its temperature 19700 \pm 3000 K. We estimate mass accretion rate onto the white dwarf of about 2.10^{-12} M_sun/yr, consistent with the predicted rate for a cool donor.
The data are available on Zenodo: zenodo.org/records/18768211. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_21440 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | BV photometry of the ultracompact binary star GP Com Zamanov, R. Dankova, L. Minev, M. Boneva, D. Yankova, K. Solar and Stellar Astrophysics We present optical B and V band photometry of GP Com - an ultracompact binary consisting of an accreting white dwarf and helium secondary component. Our data set contains 7.7 hours observations in V band with the 2.0m telescope and 2.9 hours simultaneous observations in B and V bands with the 1.5m telescope of the Rozhen National Astronomical Obsevatory, Bulgaria. The observations cover of about 13 orbital periods. We find an orbital modulation with amplitude 0.04-0.05 mag in B and V bands. Adopting that it is due to a bright spot, we estimate its temperature 19700 \pm 3000 K. We estimate mass accretion rate onto the white dwarf of about 2.10^{-12} M_sun/yr, consistent with the predicted rate for a cool donor. The data are available on Zenodo: zenodo.org/records/18768211. |
| title | BV photometry of the ultracompact binary star GP Com |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2604.21440 |