2006A&A...459L..29G


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.25CET09:22:07

2006A&A...459L..29G - Astronomy and Astrophysics, volume 459, L29-32 (2006/11-4)

X-ray accretion signatures in the close CTTS binary V4046 Sagittarii.

GUENTHER H.M., LIEFKE C., SCHMITT J.H.M.M., ROBRADE J. and NESS J.-U.

Abstract (from CDS):

We present Chandra HETGS observations of the classical T Tauri star (CTTS) V4046 Sgr. The He-like triplets of OVII, NeIX, and SiXIII are clearly detected. Similar to the CTTS TW Hya and BP Tau, the forbidden lines of OVII and NeIX are weak compared to the intercombination line, indicating high plasma densities in the X-ray emitting regions. The SiXIII triplet, however, is within the low-density limit, in agreement with the predictions of the accretion funnel infall model with an additional stellar corona. V4046 Sgr is the first close binary exhibiting these features. Together with previous high-resolution X-ray data on TW Hya and BP Tau, and in contrast to T Tau, now three out of four CTTS show evidence of accretion funnels.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: individual: V4046 Sagittarii - stars: pre-main sequence - stars: coronae - stars: activity

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* BP Tau Or* 04 19 15.8342975037 +29 06 26.929456808   13.13 12.12 11.89   K5/7Ve 604 0
2 V* T Tau Or* 04 21 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1255 2
3 M 42 HII 05 35 17.3 -05 23 28           ~ 3751 0
4 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1555 1
5 HD 319139 BY* 18 14 10.4818974563 -32 47 34.516106830   11.47 10.68   9.11 K5+K7 296 0

    Equat.    Gal    SGal    Ecl

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2020.10.25-09:22:07

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