2009MNRAS.399.1829S

Query : 2009MNRAS.399.1829S

2009MNRAS.399.1829S - Mon. Not. R. Astron. Soc., 399, 1829-1838 (2009/November-2)

Doppler images and chromospheric variability of TWA 17.

SKELLY M.B., UNRUH Y.C., BARNES J.R., LAWSON W.A., DONATI J.-F. and COLLIER CAMERON A.

Abstract (from CDS):

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. The variability in Hα suggests that the chromosphere has at least one slingshot prominence 3R* above the surface.


Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): stars: chromospheres - stars: individual: TWA 17 - stars: late-type - stars: magnetic fields - stars: pre-main-sequence - stars: spots

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 34673 PM* 05 19 12.6605338477 -03 04 25.738672935 9.705 8.88 7.86 8.35   K3V 109 0
2 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1080 0
3 V* BX Ant TT* 10 18 28.6987521312 -31 50 02.830052544   13.39 11.454 11.382 9.325 M0Ve 130 0
4 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
5 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
6 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
7 V* V1267 Cen TT* 13 20 45.3877266600 -46 11 37.711450572   14.0 12.7   10.78 K5IVe 49 0
8 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
9 V* BO Mic BY* 20 47 45.0056152368 -36 35 40.769832192   10.39 9.337   8.216 K3V(e) 214 0

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