2001A&A...370L..22G


Query : 2001A&A...370L..22G

2001A&A...370L..22G - Astronomy and Astrophysics, volume 370, L22-25 (2001/4-4)

ROSAT-HRI detection of the Class I protostar YLW16A in the ρ Ophiuchi dark cloud.

GROSSO N.

Abstract (from CDS):

I analyze unpublished or partially published archival ROSAT data of the ρ Ophiuchi dark cloud. This set of seven overlapping ROSAT HRI pointings, composed of eight ∼one-hour exposures, detects mainly the X-ray brightest T Tauri stars of this star-forming region. Only two HRI sources are new X-ray sources, and their optical counterparts are proposed as new Weak T Tauri star candidates. Meanwhile the ROSAT HRI caught during just one exposure a weak X-ray source (L=10; SNR=4.1σ for Gaussian statistics) among a group of three embedded young stellar objects including two Class I protostars. Previous ROSAT PSPC, ASCA GIS observations, and as I argue here one Einstein IPC observation, have already detected an X-ray source in this area, but this higher angular resolution data show clearly that X-rays are emitted by the Class I protostar YLW16A. This is the second Class I protostar detected by the ROSAT HRI in this dark cloud. The determination of the intrinsic X-ray luminosity of this event, LX[0.1-2.4keV]=(9.4-450)x1030erg/s, critically depends on the source absorption estimate. Improvements will be obtained only by the direct determination of this parameter from fitting of Chandra and XMM-Newton spectra.

Abstract Copyright:

Journal keyword(s): open clusters and association: ρ Oph - stars: pre-main sequence - X-rays: stars - infrared: stars

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 1RXS J162603.1-245736 X 16 26 03.1 -24 57 36           ~ 2 0
2 EM* SR 24B TT* 16 26 58.4361499704 -24 45 32.224542876           M0.5e 90 0
3 Haro 1-7 ** 16 26 58.53 -24 45 35.3           K2:e+M0.5e 102 0
4 [GY92] 194 Y*O 16 27 04.5603052200 -24 42 14.017947300       17.54 15.66 K8-M0 32 0
5 BKLT J162715-245137 TT* 16 27 15.1289055168 -24 51 38.814347988   16.9 15.02 13.86 12.38 M2 67 1
6 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 183 1
7 YLW 13B Y*O 16 27 21.46872 -24 41 43.0692           ~ 91 0
8 YLW 16C Or* 16 27 26.48952 -24 39 23.0760           M1 56 0
9 YLW 15 Y*O 16 27 26.906 -24 40 50.81           ~ 269 1
10 YLW 16D Y*O 16 27 27.89448 -24 39 43.8948           ~ 3 0
11 YLW 16 IR 16 27 28 -24 39.5           ~ 18 0
12 YLW 16A Y*O 16 27 28.02744 -24 39 33.5052           K8 194 0
13 YLW 16B Or* 16 27 29.43528 -24 39 16.1892           ~ 106 0
14 YLW 18 TT* 16 27 33.1157754648 -24 41 15.259932924       17.66 15.65 K5-K6 76 0
15 ROXR2 24 X 16 27 35.0 -25 05 10           ~ 2 0
16 YLW 47 TT* 16 27 38.3206405584 -24 36 58.594880844       17.69 15.52 M0 94 0
17 CD-24 12689 Or* 16 27 40.2857881416 -24 22 04.130226300   12.91 11.533 11.11 10.00 K5e 283 0
18 WLY 2-55 TT* 16 27 52.0872222936 -24 40 50.723707476     16.28 14.48 12.78 K7.5 81 0
19 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3636 1
20 EM* SR 20 Or* 16 28 32.6876536896 -24 22 45.008526648   16.23   12.59   G7 82 0
21 EM* SR 13 Or* 16 28 45.2768168328 -24 28 18.905579112     13.60 12.40 10.9 M2e 133 0
22 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 490 0
23 V* R CrA Ae* 19 01 53.6764322232 -36 57 08.299341828 12.781 12.651 11.917 11.242 10.412 B5IIIpe 478 1

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