2006A&A...459..199A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST22:38:08

2006A&A...459..199A - Astronomy and Astrophysics, volume 459, 199-213 (2006/11-3)

XMM-Newton survey of two upper Scorpius regions.

ARGIROFFI C., FAVATA F., FLACCOMIO E., MAGGIO A., MICELA G., PERES G. and SCIORTINO S.

Abstract (from CDS):

We studied X-ray emission from young stars by analyzing the deep XMM-Newton observations of two regions of the Upper Scorpius association with an age of 5Myr. Based on near infrared and optical photometry we identified 22 Upper Scorpius photometric members among the 224 detected X-ray sources. We derived coronal properties of Upper Scorpius stars by performing X-ray spectral and timing analyses. The study of four strong and isolated stellar flares allowed us to derive the length of the flaring loops. Among the 22 Upper Scorpius stars, 13 were identified as Upper Scorpius photometric members for the first time. The sample includes 7 weak-line T Tauri stars and 1 classical T Tauri star, while the nature of the remaining sources is unknown. Except for the intermediate mass star HD 142578, all the detected USco sources are low-mass stars of spectral types ranging from G to late M. The X-ray emission spectrum of the most intense Upper Scorpius sources indicates metal depleted plasma with temperature of ∼10MK, resembling the typical coronal emission of active main sequence stars. At least 59% of the detected members of the association have variable X-ray emission, and the flaring coronal structures appear shorter than or comparable to the stellar radii already at the Upper Scorpius age. We also found indications of increasing plasma metallicity (up to a factor 20) during strong flares. We identified a new galaxy cluster among the 224 X-ray source detected: the X-ray spectrum of its intra cluster medium indicates a redshift of ∼0.41±0.02.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: activity - stars: coronae - stars: flare - stars: pre-main sequence - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/459/199): table2.dat tableb1.dat tablec1.dat tabled1.dat>

Nomenclature: Table b1: [AFF2006b] CTIO NNNN (Nos 1-5759). Table c1: [AFF2006b] Danish NNNN (Nos 1-3570). Table d1: [AFF2006b] XMM NNN (Nos 1-224).

Status at CDS:   All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 25

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Number of rows : 25

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 HD 283447 Or* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 380 0
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1977 1
3 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 219 1
4 OMC 2 MoC 05 35 27 -05 10.1           ~ 383 1
5 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 354 1
6 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 358 1
7 UScoCTIO 113 LM* 15 56 01.0410275335 -23 38 08.153272454           M6.5 22 0
8 HD 142578 * 15 56 08.9079659145 -23 28 34.405660043   8.87 8.62     A2IV/V 13 0
9 RX J155611.1-235054 X 15 56 11.2 -23 50 54           ~ 2 0
10 2MASS J15561210-2351065 * 15 56 12.0984869086 -23 51 06.516799687           ~ 1 0
11 2MASS J15561238-2351030 * 15 56 12.3852278025 -23 51 03.102001402           ~ 1 0
12 RX J155620.6-233606 Y*O 15 56 20.6010405003 -23 36 10.037091330           M3.5e 7 0
13 RX J155627.5-233848 ** 15 56 27.6146335920 -23 38 52.017149921   16.05 14.25 14.05 11.55 ~ 6 0
14 RX J155629.3-234821 BY* 15 56 29.4191882513 -23 48 19.828475536           M1.5V 25 0
15 V* V1145 Sco BY* 15 56 54.9803260964 -23 29 47.768220860           M3V 13 0
16 UScoCTIO 104 Ro* 15 57 12.7936066772 -23 43 46.488983218           M5e 21 0
17 RX J155720.1-233847 BY* 15 57 19.9931211627 -23 38 49.863842988           M0V 23 0
18 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
19 2MASS J16130271-2257446 TT* 16 13 02.7175658951 -22 57 44.493917732   12.6 11.813   10.265 K5 28 0
20 2MASS J16131211-2305031 pr* 16 13 12.1191103249 -23 05 03.309484913       19.1 16.4 M6.5 14 0
21 2MASS J16132929-2311075 TT* 16 13 29.2885274246 -23 11 07.575773201   12.5 11.660   10.231 K1 33 0
22 2MASS J16140211-2301021 TT* 16 14 02.1139179545 -23 01 02.186787628   12.2       G4 31 0
23 CD-22 11432 TT* 16 14 11.0697507472 -23 05 36.071480044   11.90 10.70   9.255 K2IV 65 0
24 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1120 1
25 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3027 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-22:38:08

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