ASASSN-21co: A detached eclipsing binary with an 11.9 year period
| Autor: | Rowan, D. M., Stanek, K. Z., Way, Z., Kochanek, C. S., Jayasinghe, T., Thompson, Todd A., Barker, H., Hambsch, F. -J., Bohlsen, T., Kafka, Stella, Shappee, B. J., Holoien, T. W. -S., Prieto, J. L. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Res. Notes AAS 5 (2021) 147 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/2515-5172/ac0c83 |
| Popis: | We use ASAS V-band and ASAS-SN g-band observations to model the long-period detached eclipsing binary ASASSN-21co. ASAS observations show an eclipse of depth V ~ 0.6 mag in April of 2009. ASAS-SN g-band observations from March of 2021 show an eclipse of similar duration and depth, suggesting an orbital period of 11.9 years. We combine the g-band observations with additional BVRI photometry taken during the eclipse to model the eclipse using PHOEBE. We find that the system is best described by two M giants with a ratio of secondary radius to primary radius of ~0.61. Optical spectra taken during the eclipse are consistent with at least one component of the binary being an M giant, and we find no temporal changes in the spectral features. The eclipse itself is asymmetric, showing an increase in brightness near mid-eclipse, likely due to rotational variability that is too low amplitude to be observed out-of-eclipse. Comment: 4 pages, 1 figure, published in RNAAS |
| Databáze: | arXiv |
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