2009A&A...499..529S


Query : 2009A&A...499..529S

2009A&A...499..529S - Astronomy and Astrophysics, volume 499, 529-533 (2009/5-4)

The X-ray emission from Z Canis Majoris during an FUor-like outburst and the detection of its X-ray jet.

STELZER B., HUBRIG S., ORLANDO S., MICELA G., MIKULASEK Z. and SCHOELLER M.

Abstract (from CDS):

Accretion shocks have been recognized as an important X-ray emission mechanism for pre-main sequence stars, and yet the X-ray properties of FUor outbursts, events that are caused by violent accretion, have been given little attention. We observed the FUor object Z CMa during optical outburst and quiescence with Chandra. No significant changes in X-ray brightness and spectral shape were found, suggesting that the X-ray emission is coronal. The binary nature of Z CMa makes the origin of the X-ray source ambiguous. However, the moderate hydrogen column density derived from our data makes it unlikely that the embedded primary star is the X-ray source. The secondary star, which is the FUor object, is thus responsible for both the X-ray emission and the ongoing accretion outburst, which seem, however, to be unrelated phenomena. The secondary is also known to drive a large outflow and jet, which we detect here for the first time in X-rays. The distance of the X-ray emitting outflow source to the central star is greater than in jets of low-mass stars.

Abstract Copyright:

Journal keyword(s): X-rays: stars - accretion, accretion disks - stars: pre-main sequence - stars: variables: general - stars: activity - stars: winds and outflows

Nomenclature: Fig. 2: [SHO2009] A (Nos A-B, J), [SHO2009] N95-A (Nos B-C).

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* DG Tau Or* 04 27 04.6921275888 +26 06 16.060169268 13.57 13.97 10.50 12.28   K6Ve 989 1
2 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 841 0
3 V* V1118 Ori Or* 05 34 44.9889538895 -05 33 41.344187987 15.053 15.378 14.430 15.22 12.701 M1e 133 0
4 V* FU Ori Or* 05 45 22.3647842544 +09 04 12.291320064   10.72 9.60     F0Iab 769 1
5 V* V1647 Ori Or* 05 46 13.1370578472 -00 06 04.885093296     18.1     ~ 258 1
6 V* Z CMa Ae* 07 03 43.1599411656 -11 33 06.209065836 10.51 9.99 8.80     B5/8eq+F5/7 556 3
7 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 207 0
8 V* V1735 Cyg Or* 21 47 20.6628414360 +47 32 03.857457372           ~ 155 0

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2022.10.01-12:54:05

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