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On Extended Atmosphere of V509 Cas Hypergiant in 1996–2018

On Extended Atmosphere of V509 Cas Hypergiant in 1996–2018 Based on the data of spectral monitoring of the yellow hypergiant V509 Cas performed in 1996–2018 at the 6-m telescope with the spectral resolution of R ≥ 60 000, we studied in detail its kinematic state at various levels of extended atmosphere. No signs of presence of a companion were found. An agreement of radial velocities measured on the permitted and forbidden emissions of metal ions, as well as their strict temporal stability led to the choice of the systemic velocity of the star Vsys = −63 km s−1. The position of forbidden [NII] emissions forming in the circumstellar medium is strictly stable and is systematically shifted by −6 kms−1 relative to the metal ion emissions. A conclusion on the variation of the [NII] emission halfwidths and intensities (the lines have become narrower and more intense) is made after the observations in 1996 and over the next 22 years of observations, these parameters did not vary. The velocities measured from the shortwave Fe II (42) absorption components are located in a narrow interval of V r = [−84;−87] kms−1, which indicates the stability of expansion of the upper layers of the atmosphere. The overall atmosphere of the hypergiant is stable, excluding the layers close to the photosphere. The velocity variability in range of V r = [−52;−71] km s−1, identified by the positions of strong metal ion absorption cores may be a manifestation of pulsations in deep atmospheric layers, where this type of lines are formed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Astrophysical Bulletin Springer Journals

On Extended Atmosphere of V509 Cas Hypergiant in 1996–2018

Klochkova, V.; Chentsov, E.; Panchuk, V.
Astrophysical Bulletin , Volume 74 (1) – Apr 23, 2019
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References (5)

Publisher
Springer Journals
Copyright
Copyright © 2019 by Pleiades Publishing, Ltd.
Subject
Physics; Astronomy, Astrophysics and Cosmology
ISSN
1990-3413
eISSN
1990-3421
DOI
10.1134/S1990341319010048
Publisher site
See Article on Publisher Site

Abstract

Based on the data of spectral monitoring of the yellow hypergiant V509 Cas performed in 1996–2018 at the 6-m telescope with the spectral resolution of R ≥ 60 000, we studied in detail its kinematic state at various levels of extended atmosphere. No signs of presence of a companion were found. An agreement of radial velocities measured on the permitted and forbidden emissions of metal ions, as well as their strict temporal stability led to the choice of the systemic velocity of the star Vsys = −63 km s−1. The position of forbidden [NII] emissions forming in the circumstellar medium is strictly stable and is systematically shifted by −6 kms−1 relative to the metal ion emissions. A conclusion on the variation of the [NII] emission halfwidths and intensities (the lines have become narrower and more intense) is made after the observations in 1996 and over the next 22 years of observations, these parameters did not vary. The velocities measured from the shortwave Fe II (42) absorption components are located in a narrow interval of V r = [−84;−87] kms−1, which indicates the stability of expansion of the upper layers of the atmosphere. The overall atmosphere of the hypergiant is stable, excluding the layers close to the photosphere. The velocity variability in range of V r = [−52;−71] km s−1, identified by the positions of strong metal ion absorption cores may be a manifestation of pulsations in deep atmospheric layers, where this type of lines are formed.

Journal

Astrophysical Bulletin – Springer Journals

Published: Apr 23, 2019

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