2005A&A...433.1047F


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.28CET21:03:50

2005A&A...433.1047F - Astronomy and Astrophysics, volume 433, 1047-1054 (2005/4-3)

A survey for Fe 6.4 keV emission in young stellar objects in ρ Oph: The strong fluorescence from Elias 29.

FAVATA F., MICELA G., SILVA B., SCIORTINO S. and TSUJIMOTO M.

Abstract (from CDS):

We report the results of a search for 6.4keV Fe fluorescent emission in Young Stellar Objects (YSOs) with measured accretion luminosities in the ρ Oph cloud, using the existing Chandra and XMM-Newton observations of the region. A total of nine such YSOs have X-ray data with sufficiently high S/N for the 6.4keV line to be potentially detected if present. A positive detection of the Fe 6.4keV line is reported for one object, Elias 29, in both the XMM-Newton and the Chandra data. The 6.4keV line is detected in Elias 29 both during quiescent and flaring emission, unlikely all previously reported detections of 6.4keV Fe fluorescence in YSOs which were made during intense flaring. The observed equivalent width of the fluorescent line is large, Wα≃160eV, ruling out fluorescence from diffuse circumstellar material. It is also larger than expected for simple reflection from a solar-composition photosphere or circumstellar disk, but it is compatible with being due to fluorescence from a centrally illuminated circumstellar disk. The X-ray spectrum of Elias 29 is also peculiar in terms of its high (ionized) Fe abundance, as evident from the very intense Fe XXV 6.7keV line emission; we speculate on the possible mechanism leading to the observed high abundance.

Abstract Copyright:

Journal keyword(s): stars: coronae - stars: formation - stars: individual: Elias 29 - stars: individual: ρ Oph

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 283447 Or* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 386 0
2 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 779 1
3 V* XZ Tau Or* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 412 1
4 EM* SR 22 Or* 16 25 24.3511816371 -24 29 44.380737012       14.52 12.88 M0e 60 0
5 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 617 0
6 GSS 26 Y*O 16 26 10.33152 -24 20 54.8232           M0 75 1
7 DoAr 25 TT* 16 26 23.6911216715 -24 43 13.886717283       12.65   K5 133 0
8 Elia 2-24 TT* 16 26 24.0896068058 -24 16 13.456681632   16.3 14.40 15.81 13.97 K6 131 1
9 VSSG 27 Y*O 16 26 30.46896 -24 22 57.1440           M 59 1
10 GSS 39 Y*O 16 26 45.0321556934 -24 23 07.808781522           M0 150 1
11 EM* SR 24A TT* 16 26 58.5027167088 -24 45 36.698300286       14.15 12.87 K1 92 0
12 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 269 1
13 WL 6 Y*O 16 27 21.80448 -24 29 53.3616           ~ 113 0
14 YLW 16A Y*O 16 27 28.02744 -24 39 33.5052           K8 185 0
15 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3131 1

    Equat.    Gal    SGal    Ecl

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2021.02.28-21:03:50

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