2008ApJ...687..425H


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST18:17:41

2008ApJ...687..425H - Astrophys. J., 687, 425-432 (2008/November-1)

Resolving a class I protostar binary system with Chandra.

HAMAGUCHI K., CHOI M., CORCORAN M.F., CHOI C.-S., TATEMATSU K. and PETRE R.

Abstract (from CDS):

Using a subpixel event repositioning technique, we spatially resolved X-ray emission from the infrared double system IRS 5 in the R Corona Australis molecular cloud with ∼0.8" separation. As far as we know, this result–obtained from eight Chandra archival observations between 2000 and 2005–is the first X-ray study of individual sources in a Class I protostar binary system with a projected separation of less than 200 AU. We extracted light curves and spectra of the individual sources using a two-dimensional image-fitting method. IRS 5a at the south, the source that was brighter in the near-infrared, showed three X-ray flares lasting >20 ks, reminiscent of X-ray flares from pre-main-sequence stars, while the northern source (IRS 5b) was quiescent in X-rays in all the observations except for a 2005 August 9 observation with a factor of ∼2 flux enhancement. In quiescence, these sources showed almost identical X-ray spectra, with NH∼4x1022/cm2, kT∼2 keV, and logLX∼30.2-30.3 ergs/s. IRS 5a showed plasma at temperatures up to kT∼5-6 keV during flares, while the column density of IRS 5b increased by a factor of 2 during an observation on 2005 August 9. We discuss the evolutionary stages and variation of the X-ray activity of these sources.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Visual - Stars: Magnetic Fields - Stars: Pre-Main-Sequence - Techniques: High Anular Resolution - X-Rays: Stars

Simbad objects: 18

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Number of rows : 18

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 M 42 HII 05 35 17.3 -05 23 28           ~ 3751 0
2 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 333 0
3 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0
4 HD 100453 Ae* 11 33 05.5765928993 -54 19 28.543792679   8.09 7.79     A9Ve 201 1
5 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3063 0
6 HBC 667 Em* 18 28 15.249 -00 02 43.37   17.3       K7 19 1
7 2MASS J19013385-3657448 Y*O 19 01 33.859 -36 57 44.83           M2-M3 22 0
8 V* V709 CrA Or* 19 01 34.8590599569 -37 00 56.581106047   12.70 11.03     K1IV 56 0
9 HD 176386 Y*O 19 01 38.9314887024 -36 53 26.560961605 7.28 7.44 7.32 8.11   B9V 116 0
10 HH 731A HH 19 01 40.03 -36 58 57.3           ~ 4 0
11 V* TY CrA Ae* 19 01 40.8312189956 -36 52 33.801844387 10.03 9.92 9.39     B9e 268 0
12 [TS84] IRS 2 Y*O 19 01 41.569 -36 58 31.23           K2 78 0
13 2MASS J19014805-3657219 Y*O 19 01 48.056 -36 57 21.95           ~ 96 0
14 CHLT 3 * 19 01 48.10 -36 57 22.7           K6V 30 0
15 CHLT 4 * 19 01 48.15 -36 57 22.3           ~ 14 0
16 [TS84] IRS 6 Y*O 19 01 50.373 -36 56 39.05           M2 31 0
17 V* V710 CrA Or* 19 01 50.67792 -36 58 09.6132           K7: 117 0
18 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 400 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-18:17:41

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