2006A&A...446..155F


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.11CEST14:12:55

2006A&A...446..155F - Astronomy and Astrophysics, volume 446, 155-170 (2006/1-4)

Radio and X-ray variability of young stellar objects in the Coronet cluster.

FORBRICH J., PREIBISCH T. and MENTEN K.M.

Abstract (from CDS):

The Coronet cluster in the nearby R CrA dark cloud offers the rare opportunity to study at least four ``class I'' protostellar sources as well as one candidate ``class 0'' source, a Herbig Ae star, and a candidate brown dwarf within a few square arcminutes - most of them detected at radio- and X-ray wavelengths. These sources were observed with the Very Large Array (VLA) at λ=3.5cm on nine occasions in 1998, spread over nearly four months. The source IRS 5, shown earlier to emit circularly polarized radio emission, was observed to undergo a flux increase accompanied by changes in its polarization properties. Comparison with VLA measurements taken in January 1997 allows analysis of longer-term variability. In addition to this radio monitoring, we analyze archival Chandra and XMM-Newton X-ray data of these sources. Three class I protostars are bright enough for X-ray spectroscopy, and we perform a variability analysis for these sources, covering a total of 154 ks spread over more than two and a half years. Also in X-rays, IRS 5 shows the most pronounced variability, whilst the other two class I protostars IRS 1 and IRS 2 have more stable emission. X-ray data is also analyzed for the recently identified candidate class 0 source IRS 7E, which shows strong variability as well as for the Herbig Ae star R CrA for which we find extremely hot X-ray-emitting plasma. For IRS 1, 2 and 5, the hydrogen column densities derived from the X-ray spectra are at about half the values derived with near-infrared techniques, a situation similar to what has been observed towards some other young stellar objects.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: individual: R CrA - radio continuum: stars - X-rays: stars

Nomenclature: Table 3: [FPM2006] NN (Nos 1-15). Table 3: [TS84] IRS NNW (Nos 7E, 7W) added.

Simbad objects: 39

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Number of rows : 39

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 ASR 106 Y*O 03 28 59.30640 +31 15 48.5172           K2.0 51 0
2 IC 348 OpC 03 44 34 +32 09.8           ~ 1252 1
3 HD 283447 Or* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 386 0
4 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1251 0
5 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 818 0
6 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3679 0
7 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2050 1
8 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 234 1
9 Ass Cha T 2-21 TT* 11 06 15.3485848381 -77 21 56.737939872   12.58 11.01   9.35 G5Ve 125 0
10 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3855 2
11 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 617 0
12 YLW 15 Y*O 16 27 26.93640 -24 40 50.8224           ~ 245 1
13 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3156 1
14 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 967 2
15 2MASS J18295785+0112514 Y*O 18 29 57.858 +01 12 51.40           ~ 59 3
16 [TS84] IRS 2 Y*O 19 01 41.569 -36 58 31.23           K2 78 0
17 HH 101 HH 19 01 42 -37 00.7           ~ 44 0
18 CHLT 2 BD? 19 01 43.3 -36 59 12           ~ 9 0
19 [FP2007] J190144.22-365853.6 Y*O 19 01 44.22 -36 58 53.6           ~ 2 0
20 NGC 6729 ISM 19 01 46.4 -36 57 40           ~ 54 0
21 2MASS J19014805-3657219 Y*O 19 01 48.056 -36 57 21.95           ~ 97 0
22 CHLT 3 * 19 01 48.10 -36 57 22.7           K6V 30 0
23 2MASS J19014846-3657148 Y*O 19 01 48.461 -36 57 14.88           ~ 18 0
24 [TS84] IRS 6 Y*O 19 01 50.373 -36 56 39.05           M2 31 0
25 V* V710 CrA Or* 19 01 50.67792 -36 58 09.6132           K7: 118 0
26 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 412 0
27 [WMB97] 185830.2-370122 Y*O 19 01 52.63 -36 57 00.2           ~ 29 0
28 V* R CrA Ae* 19 01 53.6850227874 -36 57 08.145519972 12.781 12.651 11.917 11.242 10.412 B5IIIpe 456 1
29 NAME Coronet Cluster Cl* 19 01 54 -36 57.2           ~ 82 1
30 CHLT 8 Y*O 19 01 55.0 -36 57 16           ~ 4 0
31 [NWA2005] SMM 1C mm 19 01 55.28 -36 57 16.6           ~ 23 1
32 CHLT 12 Y*O 19 01 55.4 -36 57 13           ~ 4 0
33 2MASS J19015545-3657231 Y*O 19 01 55.460 -36 57 23.13           ~ 91 2
34 [CKR2003] MMS 13 smm 19 01 55.5 -36 57 38           ~ 21 0
35 [NWA2005] SMM 1B Y*O 19 01 56.41 -36 57 28.0           ~ 83 1
36 [FPM2006] 15 Y*O 19 01 56.5 -36 57 26           ~ 2 0
37 2MASS J19015865-3656170 Y*? 19 01 58.6534091541 -36 56 17.179942651           ~ 17 0
38 V* T CrA Ae* 19 01 58.7901571143 -36 57 50.329832417     11.67     F0 157 0
39 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 713 0

    Equat.    Gal    SGal    Ecl

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2021.04.11-14:12:55

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