Doppler images and chromospheric variability of TWA 17

M.B. Skelly; Y.C. Unruh; J.R. Barnes; W.A. Lawson; J-F. Donati; A.C. Cameron

doi:10.1111/j.1365-2966.2009.15411.x

Doppler images and chromospheric variability of TWA 17

M.B. Skelly, Y.C. Unruh, J.R. Barnes, W.A. Lawson, J-F. Donati, A.C. Cameron

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

33 Downloads (Pure)

Abstract

We present Doppler imaging and a Balmer line analysis of the weak-line T Tauri star TWA 17. Spectra were taken in 2006 with the University College London Echelle Spectrograph on the Anglo-Australian Telescope. Using least-squares deconvolution to improve the effective signal-to-noise ratio, we produced a Doppler map of the surface spot distribution. This shows similar features to maps of other rapidly rotating T Tauri stars, i.e. a polar spot with more spots extending out of it down to the equator. In addition to the photospheric variability, the chromospheric variability was studied using the Balmer emission. The mean Hα profile has a narrow component consistent with rotational broadening and a broad component extending out to 220 km s−1. The variability in Hα suggests that the chromosphere has at least one slingshot prominence 3R* above the surface.

Original language	English
Pages (from-to)	1829-1838
Journal	Monthly Notices of the Royal Astronomical Society
Volume	399
Issue number	4
DOIs	https://doi.org/10.1111/j.1365-2966.2009.15411.x
Publication status	Published - 2009

Access to Document

10.1111/j.1365-2966.2009.15411.x

903653.pdf

Cite this

@article{bbb05cd970bc441195b750b193f5437b,

title = "Doppler images and chromospheric variability of TWA 17",

abstract = "We present Doppler imaging and a Balmer line analysis of the weak-line T Tauri star TWA 17. Spectra were taken in 2006 with the University College London Echelle Spectrograph on the Anglo-Australian Telescope. Using least-squares deconvolution to improve the effective signal-to-noise ratio, we produced a Doppler map of the surface spot distribution. This shows similar features to maps of other rapidly rotating T Tauri stars, i.e. a polar spot with more spots extending out of it down to the equator. In addition to the photospheric variability, the chromospheric variability was studied using the Balmer emission. The mean Hα profile has a narrow component consistent with rotational broadening and a broad component extending out to 220 km s−1. The variability in Hα suggests that the chromosphere has at least one slingshot prominence 3R* above the surface.",

author = "M.B. Skelly and Y.C. Unruh and J.R. Barnes and W.A. Lawson and J-F. Donati and A.C. Cameron",

note = "{\textquoteleft}The definitive version is available at www3.interscience.wiley.com '. Copyright Royal Astronomical Society. DOI: 10.1111/j.1365-2966.2009.15411.x",

year = "2009",

doi = "10.1111/j.1365-2966.2009.15411.x",

language = "English",

volume = "399",

pages = "1829--1838",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press (OUP)",

number = "4",

}

TY - JOUR

T1 - Doppler images and chromospheric variability of TWA 17

AU - Skelly, M.B.

AU - Unruh, Y.C.

AU - Barnes, J.R.

AU - Lawson, W.A.

AU - Donati, J-F.

AU - Cameron, A.C.

N1 - ‘The definitive version is available at www3.interscience.wiley.com '. Copyright Royal Astronomical Society. DOI: 10.1111/j.1365-2966.2009.15411.x

PY - 2009

Y1 - 2009

N2 - We present Doppler imaging and a Balmer line analysis of the weak-line T Tauri star TWA 17. Spectra were taken in 2006 with the University College London Echelle Spectrograph on the Anglo-Australian Telescope. Using least-squares deconvolution to improve the effective signal-to-noise ratio, we produced a Doppler map of the surface spot distribution. This shows similar features to maps of other rapidly rotating T Tauri stars, i.e. a polar spot with more spots extending out of it down to the equator. In addition to the photospheric variability, the chromospheric variability was studied using the Balmer emission. The mean Hα profile has a narrow component consistent with rotational broadening and a broad component extending out to 220 km s−1. The variability in Hα suggests that the chromosphere has at least one slingshot prominence 3R* above the surface.

AB - We present Doppler imaging and a Balmer line analysis of the weak-line T Tauri star TWA 17. Spectra were taken in 2006 with the University College London Echelle Spectrograph on the Anglo-Australian Telescope. Using least-squares deconvolution to improve the effective signal-to-noise ratio, we produced a Doppler map of the surface spot distribution. This shows similar features to maps of other rapidly rotating T Tauri stars, i.e. a polar spot with more spots extending out of it down to the equator. In addition to the photospheric variability, the chromospheric variability was studied using the Balmer emission. The mean Hα profile has a narrow component consistent with rotational broadening and a broad component extending out to 220 km s−1. The variability in Hα suggests that the chromosphere has at least one slingshot prominence 3R* above the surface.

U2 - 10.1111/j.1365-2966.2009.15411.x

DO - 10.1111/j.1365-2966.2009.15411.x

M3 - Article

SN - 0035-8711

VL - 399

SP - 1829

EP - 1838

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

Doppler images and chromospheric variability of TWA 17

Abstract

Access to Document

Fingerprint

Cite this