2007A&A...475..959F

Query : 2007A&A...475..959F

2007A&A...475..959F - Astronomy and Astrophysics, volume 475959-972 (2007/12-1)

Coronae in the Coronet: a very deep X-ray look into a stellar nursery.

FORBRICH J. and PREIBISCH T.

Abstract (from CDS):

To study the X-ray properties of young stellar objects (YSOs), we analyze an exceptionally sensitive Chandra dataset of the Coronet cluster in the CrA star-forming region, achieving a limiting luminosity of LX,min∼5x1026erg/s for lightly absorbed sources. This dataset represents one of the most sensitive X-ray observations ever obtained of a star-forming region. The X-ray data are used to investigate the membership status of tentative members of the region, to derive plasma temperatures and X-ray luminosities of the YSOs, and to investigate variability on the timescale of several years. 46 of the 92 X-ray sources in the merged Chandra image can be identified with optical or near/mid-infrared counterparts. X-ray emission is detected from all of the previously known optically visible late-type (spectral types G to M) stellar cluster members, from five of the eight brown dwarf candidates, and from nine embedded objects (``protostars'') with class 0, class I, or flat-spectrum spectral-energy distributions (SEDs) in the field of view. While the Herbig Ae/Be stars TY CrA and R CrA, a close companion of the B9e star HD 176386, and the F0e star T CrA are detected, no X-ray emission is found from any of the Herbig-Haro (HH) objects or the protostellar cores without infrared source. We find indications for diffuse X-ray emission near R CrA/IRS 7. The observed X-ray properties of the Coronet YSOs are consistent with coronal activity; soft spectral components hinting towards X-ray emission from accretion shocks were not found. The X-ray emission of the AeBe stars TY CrA and HD 176386 probably originates from close late-type companions. The Ae star R CrA shows a peculiar X-ray spectrum and an extremely hot plasma temperature. Finally, we discuss the differences of the X-ray properties of YSOs in different evolutionary stages.

Abstract Copyright: ∼

Journal keyword(s): stars: pre-main sequence - stars: activity - stars: magnetic fields - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/475/959): table2.dat tablea1.dat tablea2.dat>

Nomenclature: Table a1: [FP2007] JHHMMSS.ss+DDMMSS.s N=92.

Simbad objects: 117

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Number of rows : 117
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 V* AB Aur Ae* 04 55 45.8458932216 +30 33 04.292077032 7.20 7.16 7.05 6.96 6.70 A0Ve 1176 2
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
3 HH 2 HH 05 36.4 -06 47           ~ 341 1
4 V* FU Ori Or* 05 45 22.3647842544 +09 04 12.291320064   10.72 9.60     F0Iab 888 1
5 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
6 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
7 HD 163296 Ae* 17 56 21.2881851168 -21 57 21.871819008 7.00 6.93 6.85 6.86 6.67 A3VaekA1mA1 1301 0
8 V* LS CrA RR* 18 02 16.3020471216 -38 43 04.971378972         14.370 ~ 7 0
9 2MASS J19010460-3701292 Y*O 19 01 04.6080393960 -37 01 29.284737816           M4 16 0
10 2E 4175 X 19 01 05.05 -37 03 40.2           ~ 3 0
11 2MASS J19010586-3657570 SB* 19 01 05.8644837000 -36 57 57.021037200   17.0 13.78     ~ 5 0
12 [FP2007] J190108.31-365634.7 X 19 01 08.31 -36 56 34.7           ~ 1 0
13 V* S CrA Or* 19 01 08.597088 -36 57 19.89504   11.76 10.91 11.41   G0Ve+K0Ve 286 0
14 [FP2007] J190111.30-365551.9 X 19 01 11.30 -36 55 51.9           ~ 1 0
15 [FP2007] J190114.54-370102.3 X 19 01 14.54 -37 01 02.3           ~ 1 0
16 [FP2007] J190115.32-365237.2 X 19 01 15.32 -36 52 37.2           ~ 1 0
17 [SHJ2008] G-115 Y*O 19 01 15.8638254408 -37 03 44.386803900           ~ 4 0
18 V* V667 CrA Or* 19 01 16.2871007376 -36 56 28.277849904           M5 28 0
19 [FP2007] J190116.65-365638.9 X 19 01 16.65 -36 56 38.9           ~ 1 0
20 [FP2007] J190117.52-365831.9 X 19 01 17.52 -36 58 31.9           ~ 1 0
21 [FP2007] J190118.29-365906.7 X 19 01 18.29 -36 59 06.7           ~ 1 0
22 2MASS J19011893-3658282 Y*O 19 01 18.9402669744 -36 58 28.245913644       18.4   M4.5 26 0
23 [FP2007] J190119.39-370142.0 X 19 01 19.39 -37 01 42.0           ~ 2 0
24 [FP2007] J190120.07-370422.9 X 19 01 20.07 -37 04 22.9           ~ 1 0
25 2MASS J19012083-3703027 Y*O 19 01 20.8420768896 -37 03 02.766814272           M5 21 0
26 [FP2007] J190122.40-370055.4 X 19 01 22.40 -37 00 55.4           ~ 2 0
27 [FP2007] J190123.95-365721.5 X 19 01 23.95 -36 57 21.5           ~ 1 0
28 2MASS J19012562-3704535 Y*O 19 01 25.6336969968 -37 04 53.583994740           M5.5 17 0
29 2MASS J19012576-3659191 Y*O 19 01 25.7757189264 -36 59 19.589714844   21.2 19.2     ~ 20 0
30 [FP2007] J190126.10-365501.9 X 19 01 26.10 -36 55 01.9           ~ 1 0
31 2MASS J19012717-3659085 TT* 19 01 27.1758555480 -36 59 08.597796900   18.3 16.9     M 26 0
32 GSC 07421-02198 Y*O 19 01 28.7317755864 -36 59 31.793030484         13.15 M1.0 20 0
33 2MASS J19012901-3701484 Y*O 19 01 29.0328872976 -37 01 48.513865908           M3.75 27 0
34 [FP2007] J190131.28-365931.0 X 19 01 31.28 -36 59 31.0           ~ 1 0
35 [FP2007] J190131.73-365445.4 X 19 01 31.73 -36 54 45.4           ~ 1 0
36 [FP2007] J190132.01-365121.7 X 19 01 32.01 -36 51 21.7           ~ 1 0
37 2MASS J19013232-3658030 Y*O 19 01 32.3360615568 -36 58 03.485079948           M4 27 0
38 2MASS J19013357-3700304 Or* 19 01 33.5761986624 -37 00 30.453110028           M6 51 0
39 [FP2007] J190133.61-370606.2 X 19 01 33.61 -37 06 06.2           ~ 1 0
40 2MASS J19013385-3657448 Y*O 19 01 33.8699665872 -36 57 45.328545972           M3 27 0
41 [FP2007] J190134.65-365438.4 X 19 01 34.65 -36 54 38.4           ~ 1 0
42 V* V709 CrA Or* 19 01 34.8589591776 -37 00 56.579123412   12.70 11.03     K1IV 71 0
43 [FP2007] J190135.42-370340.9 X 19 01 35.42 -37 03 40.9           ~ 1 0
44 [FP2007] J190137.07-365601.9 X 19 01 37.07 -36 56 01.9           ~ 2 0
45 [WMB97] 185815.3-370435 IR 19 01 37.8 -37 00 16           ~ 4 0
46 HD 176386 Or* 19 01 38.9318002416 -36 53 26.561166432 7.28 7.44 7.32 8.11   B9Vbs 149 0
47 HD 176386B Y*O 19 01 39.1617674928 -36 53 29.571918828           K7: 27 0
48 RX J1901.6-3702 Y*O 19 01 39.305016 -37 02 07.39428   16.146 14.826 14.334   M0-M2/M2.5 9 0
49 2MASS J19014041-3651422 Y*O 19 01 40.4193504864 -36 51 42.358652244           M3 23 0
50 [FP2007] J190140.63-365758.9 X 19 01 40.63 -36 57 58.9           ~ 1 0
51 [FP2007] J190140.67-365923.9 X 19 01 40.67 -36 59 23.9           ~ 1 0
52 [FP2007] J190140.70-370052.9 X 19 01 40.70 -37 00 52.9           ~ 1 0
53 V* TY CrA Ae* 19 01 40.8284458320 -36 52 33.816176040 10.03 9.92 9.39     B9e 301 0
54 [FP2007] J190141.35-370419.3 X 19 01 41.35 -37 04 19.3           ~ 1 0
55 [FP2007] J190141.49-370441.7 X 19 01 41.49 -37 04 41.7           ~ 1 0
56 [TS84] IRS 2 Y*O 19 01 41.569 -36 58 31.23           K2 97 0
57 2MASS J19014164-3659528 Or* 19 01 41.6426330712 -36 59 52.868573844   17.7 16.7     M2 40 0
58 2MASS J19014308-3650190 Y*O 19 01 43.0860071736 -36 50 19.015841904           ~ 5 0
59 [FP2007] J190143.80-370614.0 X 19 01 43.80 -37 06 14.0           ~ 1 0
60 [FP2007] J190144.22-365853.6 Y*O 19 01 44.22 -36 58 53.6           ~ 2 0
61 [FP2007] J190145.91-364929.3 X 19 01 45.91 -36 49 29.3           ~ 1 0
62 [FP2007] J190146.18-370241.8 X 19 01 46.18 -37 02 41.8           ~ 1 0
63 [FP2007] J190147.01-365326.9 X 19 01 47.01 -36 53 26.9           ~ 1 0
64 2MASS J19014791-3659302 Y*O 19 01 47.92 -36 59 30.3           ~ 18 0
65 2MASS J19014805-3657219 Y*O 19 01 48.056 -36 57 21.95           ~ 108 0
66 CHLT 3 * 19 01 48.10 -36 57 22.7           K6V 37 0
67 CHLT 4 * 19 01 48.15 -36 57 22.3           ~ 17 0
68 2MASS J19014846-3657148 Y*O 19 01 48.461 -36 57 14.88           ~ 34 0
69 [FP2007] J190148.53-370611.2 X 19 01 48.53 -37 06 11.2           ~ 1 0
70 [FP2007] J190148.97-370151.7 X 19 01 48.97 -37 01 51.7           ~ 1 0
71 UCAC4 265-183516 Or* 19 01 49.3660476264 -37 00 28.636309008   18.4   16.6   M4.5 19 0
72 [TS84] IRS 6 Y*O 19 01 50.373 -36 56 39.05           M2 38 0
73 [FP2007] J190150.38-365935.3 X 19 01 50.38 -36 59 35.3           ~ 1 0
74 V* V710 CrA Or* 19 01 50.67792 -36 58 09.6132           K7: 131 0
75 2MASS J19015112-3654122 Y*O 19 01 51.129 -36 54 12.28           M2 21 0
76 [FP2007] J190152.10-370542.4 X 19 01 52.10 -37 05 42.4           ~ 1 0
77 [FP2007] J190152.20-365809.0 X 19 01 52.20 -36 58 09.0           ~ 2 0
78 [B92b] 30 Y*O 19 01 52.63 -36 57 00.2           ~ 31 0
79 V* R CrA Ae* 19 01 53.6764322232 -36 57 08.299341828 12.781 12.651 11.917 11.242 10.412 B5IIIpe 499 2
80 2MASS J19015374-3700339 Y*O 19 01 53.7537206544 -37 00 34.050751956           M7.5 27 2
81 [FP2007] J190153.92-365228.8 X 19 01 53.92 -36 52 28.8           ~ 1 0
82 NAME Coronet Cluster Cl* 19 01 54 -36 57.2           ~ 106 1
83 2MASS J19015545-3657231 Y*O 19 01 55.460 -36 57 23.13           ~ 105 2
84 [FP2007] J190155.61-365651.1 Y*O 19 01 55.61 -36 56 51.0           ~ 9 0
85 [FP2007] J190155.76-365727.7 Y*O 19 01 55.77 -36 57 27.5           ~ 14 0
86 [FP2007] J190155.85-365204.3 X 19 01 55.85 -36 52 04.3           ~ 2 0
87 CHLT 14 Y*O 19 01 56.41 -36 57 28.0           ~ 121 1
88 2MASS J19015741-3703117 Y*O 19 01 57.42 -37 03 11.8           M5.5 7 0
89 2MASS J19015833-3700267 Y*O 19 01 58.34 -37 00 26.8           M5 9 0
90 CHLT 15 Y*O 19 01 58.55 -36 57 08.7           ~ 28 0
91 V* T CrA Ae* 19 01 58.777008 -36 57 49.93704   14.087 13.130 11.823 10.678 F5? 179 0
92 2MASS J19020012-3702220 TT* 19 02 00.1219249728 -37 02 22.132961880   17.0 16.1     M4 22 0
93 [FP2007] J190200.49-365507.2 X 19 02 00.49 -36 55 07.2           ~ 1 0
94 [FP2007] J190201.94-365400.1 Y*O 19 02 01.96 -36 54 00.0           ~ 8 0
95 V* V702 CrA Or* 19 02 01.9776932592 -37 07 43.519646568   11.28 10.512   9.512 G5e 54 0
96 [FP2007] J190202.16-365919.1 X 19 02 02.16 -36 59 19.1           ~ 1 0
97 2MASS J19020296-3700109 NIR 19 02 02.96 -37 00 10.9           ~ 3 0
98 [FP2007] J190203.82-365851.0 X 19 02 03.82 -36 58 51.0           ~ 1 0
99 [FP2007] J190204.22-370420.9 X 19 02 04.22 -37 04 20.9           ~ 1 0
100 2MASS J19020491-3658564 NIR 19 02 04.9132716408 -36 58 56.521941060           ~ 1 0
101 2MASS J19020682-3658411 Y*O 19 02 06.8170838064 -36 58 41.161527660           M9/M9.25 10 0
102 ISO-CrA 140 Y*O 19 02 10.03 -36 56 49.0           ~ 4 0
103 [FP2007] J190210.72-370559.2 X 19 02 10.72 -37 05 59.2           ~ 1 0
104 2MASS J19021201-3703093 Y*O 19 02 12.0189397320 -37 03 09.420563916           M4.75 27 0
105 2MASS J19021464-3700328 Y*O 19 02 14.648 -37 00 32.86           ~ 11 0
106 [FP2007] J190215.00-365232.2 X 19 02 15.00 -36 52 32.2           ~ 1 0
107 [WMB97] 185853.3-370328 IR 19 02 15.7 -36 59 06           ~ 6 0
108 [FP2007] J190216.54-365637.8 X 19 02 16.54 -36 56 37.8           ~ 1 0
109 [FP2007] J190219.19-370346.3 X 19 02 19.19 -37 03 46.3           ~ 1 0
110 [FP2007] J190221.22-365013.5 X 19 02 21.22 -36 50 13.5           ~ 1 0
111 [FP2007] J190221.79-365604.2 X 19 02 21.79 -36 56 04.2           ~ 1 0
112 [FP2007] J190222.12-365313.2 X 19 02 22.12 -36 53 13.2           ~ 1 0
113 2MASS J19022213-3655409 TT* 19 02 22.1300594952 -36 55 40.964075976   15.17 13.72 12.5   K2IV 46 0
114 [FP2007] J190222.71-365308.5 X 19 02 22.71 -36 53 08.5           ~ 1 0
115 2MASS J19022708-3658132 TT* 19 02 27.1008912432 -36 58 13.677942828   15.60 13.59 12.5   M1.9 42 0
116 2MASS J19023308-3658212 Y*O 19 02 33.0807051408 -36 58 21.278255160           M 21 0
117 Parsamian 21 Or* 19 29 00.8740757136 +09 38 42.862226208   15.18 14.07 13.93   F5Iabe 95 0

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