IRAS 22272+5435 (V354 Lac): Multicolor Photometry of a Variable Carbon-rich post-AGB Star and a Dust Formation Episode
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915379494780928 |
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| author | Ikonnikova, N. P. Shenavrin, V. I. Komissarova, G. V. Burlak, M. A. |
| author_facet | Ikonnikova, N. P. Shenavrin, V. I. Komissarova, G. V. Burlak, M. A. |
| contents | We present new UBV photometric observations (2009-2024) of the carbon-rich post-AGB star IRAS 22272+5435 (V354 Lac), combined with our data spanning over 30 years (1991-2024). The star shows pulsations with two closely spaced periods, 127 and 132 d, which cause brightness variations of variable amplitude. We also detect low-amplitude oscillations with a 661-day period, of uncertain origin. Color analysis reveals both temperature variations during pulsations and spectral anomalies. For the first time, we analyze long-term JHKLM photometry (1994-2024), showing increased KLM-band brightness from 1996 to 2004 - likely due to dust emission following a sudden mass ejection. The absence of strong optical variability suggests either a large angle between the ejection direction and the line of sight or a low optical depth of the ejected material. We discuss possible mechanisms and observational signatures of this dust-formation event. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_06777 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | IRAS 22272+5435 (V354 Lac): Multicolor Photometry of a Variable Carbon-rich post-AGB Star and a Dust Formation Episode Ikonnikova, N. P. Shenavrin, V. I. Komissarova, G. V. Burlak, M. A. Solar and Stellar Astrophysics We present new UBV photometric observations (2009-2024) of the carbon-rich post-AGB star IRAS 22272+5435 (V354 Lac), combined with our data spanning over 30 years (1991-2024). The star shows pulsations with two closely spaced periods, 127 and 132 d, which cause brightness variations of variable amplitude. We also detect low-amplitude oscillations with a 661-day period, of uncertain origin. Color analysis reveals both temperature variations during pulsations and spectral anomalies. For the first time, we analyze long-term JHKLM photometry (1994-2024), showing increased KLM-band brightness from 1996 to 2004 - likely due to dust emission following a sudden mass ejection. The absence of strong optical variability suggests either a large angle between the ejection direction and the line of sight or a low optical depth of the ejected material. We discuss possible mechanisms and observational signatures of this dust-formation event. |
| title | IRAS 22272+5435 (V354 Lac): Multicolor Photometry of a Variable Carbon-rich post-AGB Star and a Dust Formation Episode |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2507.06777 |