Discovery of an optical cocoon tail behind the runaway HD 185806
| Autor: | Z T Spetsieri, P Boumis, A Chiotellis, S Akras, S Derlopa, S Shetye, D M-A Meyer, D M Bowman, V V Gvaramadze |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
stars
stars: kinematics and dynamics BIPOLAR FOS: Physical sciences Astronomy & Astrophysics mass-loss STELLAR SPECTRA stellar spectra evolution emission AGB individual: HD 185806 [stars] kinematics and dynamics [stars] Solar and Stellar Astrophysics (astro-ph.SR) Science & Technology wind bow-shocks Astronomy and Astrophysics MASS-LOSS stars: individual: hd 185806 Astrophysics - Astrophysics of Galaxies bipolar EVOLUTION SIMULATIONS kinematics and dynamics [ISM] ism: kinematics and dynamics Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) planetary-nebulae agb Physical Sciences WIND BOW-SHOCKS simulations PLANETARY-NEBULAE EMISSION STARS |
| Popis: | Studies on the circumstellar structures around evolved stars provide vital information on the evolution of the parent star and the properties of the local interstellar medium. In this work, we present the discovery and characterization of an optical cocoon tail behind the star HD 185806. The cocoon apex emission is puzzling, as it is detected in the infrared but shows no signal in the optical wavelength. The H-alpha and [OIII] fluxes of the nebular structure vary from 2.7 to 8.5x10^{-12} erg s^{-1} cm^ {-2} and from 0.9 to 7.0x10^{-13} erg s^{-1} cm^{-2}, respectively. Through high-resolution spectroscopy, we derive the spectral type of the star, construct the position-velocity diagrams of the cocoon tail for the H-alpha, [OIII] and [NII] emission lines, and determine its velocity in the range of -100 to 40 km s ^{-1} . Furthermore, we use SED fitting and MESA evolutionary models adopting a distance of 900 pc, and classify HD 185806 as a 1.3 M star, in the transition phase between the RGB and early AGB stages. Finally, we study the morpho-kinematic structure of the cocoon tail using the astronomical software SHAPE. An ellipsoidal structure, with an inclination of 19 degrees with respect to the plane of sky is found to better reproduce the observed cocoon tail of HD 185806. Accepted 2022 June 29. Received 2022 June 24; in original form 2022 May 26, 14 pages. Dedicated to V.G. who passed away on 2 Sept. 2021 |
| Databáze: | OpenAIRE |
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