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Title: LOOKING DEEP INTO THE CAT'S EYE: STRUCTURE AND ROTATION IN THE FAST WIND OF THE PN CENTRAL STAR OF NGC 6543

Abstract

We present HST/STIS time-series spectroscopy of the central star of the 'Cat's Eye' planetary nebula NGC 6543. Intensive monitoring of the UV lines over a 5.8 hr period reveals well-defined details of large-scale structure in the fast wind, which are exploited to provide new constraints on the rotation rate of the central star. We derive characteristics of the line profile variability that support a physical origin due to corotating interaction regions (CIRs) that are rooted at the stellar surface. The recurrence time of the observed spectral signatures of the CIRs is used to estimate the rotation period of the central star and, adopting a radius between 0.3 and 0.6 R{sub Sun} constrains the rotational velocity to the range 54 km s{sup -1} {<=} v{sub rot} {<=} 108 km s{sup -1}. The implications of these results for single star evolution are discussed based on models calculated here for low-mass stars. Our models predict a subsurface convective layer in NGC 6543 which we argue to be causally connected to the occurrence of structure in the fast wind.

Authors:
 [1];  [2];  [3]
  1. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom)
  2. Space Telescope Science Institute, Baltimore, MD 21218 (United States)
  3. Kavli Institute for Theoretical Physics, University of California Santa Barbara, CA 93106 (United States)
Publication Date:
OSTI Identifier:
22078451
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 759; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR VELOCITY; MASS; PLANETARY NEBULAE; RADIATION MONITORING; ROTATION; SPECTROSCOPY; STAR EVOLUTION; STARS; SURFACES; ULTRAVIOLET RADIATION

Citation Formats

Prinja, R. K., Massa, D. L., and Cantiello, M. LOOKING DEEP INTO THE CAT'S EYE: STRUCTURE AND ROTATION IN THE FAST WIND OF THE PN CENTRAL STAR OF NGC 6543. United States: N. p., 2012. Web. doi:10.1088/2041-8205/759/2/L28.
Prinja, R. K., Massa, D. L., & Cantiello, M. LOOKING DEEP INTO THE CAT'S EYE: STRUCTURE AND ROTATION IN THE FAST WIND OF THE PN CENTRAL STAR OF NGC 6543. United States. doi:10.1088/2041-8205/759/2/L28.
Prinja, R. K., Massa, D. L., and Cantiello, M. Sat . "LOOKING DEEP INTO THE CAT'S EYE: STRUCTURE AND ROTATION IN THE FAST WIND OF THE PN CENTRAL STAR OF NGC 6543". United States. doi:10.1088/2041-8205/759/2/L28.
@article{osti_22078451,
title = {LOOKING DEEP INTO THE CAT'S EYE: STRUCTURE AND ROTATION IN THE FAST WIND OF THE PN CENTRAL STAR OF NGC 6543},
author = {Prinja, R. K. and Massa, D. L. and Cantiello, M.},
abstractNote = {We present HST/STIS time-series spectroscopy of the central star of the 'Cat's Eye' planetary nebula NGC 6543. Intensive monitoring of the UV lines over a 5.8 hr period reveals well-defined details of large-scale structure in the fast wind, which are exploited to provide new constraints on the rotation rate of the central star. We derive characteristics of the line profile variability that support a physical origin due to corotating interaction regions (CIRs) that are rooted at the stellar surface. The recurrence time of the observed spectral signatures of the CIRs is used to estimate the rotation period of the central star and, adopting a radius between 0.3 and 0.6 R{sub Sun} constrains the rotational velocity to the range 54 km s{sup -1} {<=} v{sub rot} {<=} 108 km s{sup -1}. The implications of these results for single star evolution are discussed based on models calculated here for low-mass stars. Our models predict a subsurface convective layer in NGC 6543 which we argue to be causally connected to the occurrence of structure in the fast wind.},
doi = {10.1088/2041-8205/759/2/L28},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}