Optical observations of the fast nova V1674 Herculis
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866908849586307072 |
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| author | Rawat, Neeraj Singh Sonith, L. S. Kamath, U. S. Bhargava, Yash Anupama, G. C. Singh, Kulinder Pal |
| author_facet | Rawat, Neeraj Singh Sonith, L. S. Kamath, U. S. Bhargava, Yash Anupama, G. C. Singh, Kulinder Pal |
| contents | We present the evolution of optical spectra and lightcurves of the fast nova V1674 Herculis during 150 days past its eruption. Using the post-eruption AAVSO light curve, we have calculated the orbital period of V1674 Her to be 0.153 days. There is no unambiguous white dwarf spin period in our data. The optical spectra show that the ionisation increases with time. A morpho-kinematic analysis of the H$α$ line profile indicates a bipolar morphology with polar blobs and an equatorial ring. Lyman beta fluorescence is found to be the dominant mechanism for the excitation of neutral oxygen. On day 19.87, [Ne III] & [Ne V] lines are present, indicating the presence of the ONe white dwarf. On day 147.66, the nebular lines are still present, implying that the nova had not gone into quiescence yet; this spectrum is accretion-dominated. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_19940 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Optical observations of the fast nova V1674 Herculis Rawat, Neeraj Singh Sonith, L. S. Kamath, U. S. Bhargava, Yash Anupama, G. C. Singh, Kulinder Pal High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We present the evolution of optical spectra and lightcurves of the fast nova V1674 Herculis during 150 days past its eruption. Using the post-eruption AAVSO light curve, we have calculated the orbital period of V1674 Her to be 0.153 days. There is no unambiguous white dwarf spin period in our data. The optical spectra show that the ionisation increases with time. A morpho-kinematic analysis of the H$α$ line profile indicates a bipolar morphology with polar blobs and an equatorial ring. Lyman beta fluorescence is found to be the dominant mechanism for the excitation of neutral oxygen. On day 19.87, [Ne III] & [Ne V] lines are present, indicating the presence of the ONe white dwarf. On day 147.66, the nebular lines are still present, implying that the nova had not gone into quiescence yet; this spectrum is accretion-dominated. |
| title | Optical observations of the fast nova V1674 Herculis |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2602.19940 |