Hubble Space Telescope STIS Spectroscopy of Nova T Aurigae 1891
| Autor: | Conor Larsen, Patrick Godon, Edward M. Sion |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | The Astronomical Journal. 163:300 |
| ISSN: | 1538-3881 0004-6256 |
| DOI: | 10.3847/1538-3881/ac5db7 |
| Popis: | T Aurigae is an eclipsing old nova that exploded in 1891. At a Gaia EDR3 distance of 815–871 pc, it is a relatively nearby old nova. Through ultraviolet spectral modeling and using the new precise Gaia distance, we find that the HST/STIS spectrum of T Aurigae is consistent with an accretion disk with a mass-transfer rate M ̇ of the order of 10−8 M ⊙ yr−1, for a white-dwarf mass of M wd ≈ 0.7 ± 0.2M ⊙, an inclination of i ∼ 60°, and a Gaia distance of of 840 − 25 + 31 pc. The sharp absorption lines of metals cannot form in the disk and are likely forming in material above the disk (e.g., due stream disk overflow), in circumbinary material, and/or in material associated with the ejected shell from the 1891 nova explosion. The saturated hydrogen Lyα absorption feature is attributed to a large interstellar-medium hydrogen-column density of the order of 1021cm−2 toward T Aur, as corroborated by the value of its reddening E(B − V) = 0.42 ± 0.08. |
| Databáze: | OpenAIRE |
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