2022A&A...661A..40S


Query : 2022A&A...661A..40S

2022A&A...661A..40S - Astronomy and Astrophysics, volume 661A, 40-40 (2022/5-1)

X-raying the Sco-Cen OB association: The low-mass stellar population revealed by eROSITA.

SCHMITT J.H.M.M., CZESLA S., FREUND S., ROBRADE J. and SCHNEIDER P.C.

Abstract (from CDS):

We present the results of the first X-ray all-sky survey (eRASS1) performed by the eROSITA instrument on board the Spectrum-Roentgen-Gamma observatory of the Sco-Cen OB association. Bona fide Sco-Cen member stars are young and are therefore expected to emit X-rays at the saturation level. The sensitivity limit of eRASS1 makes these stars detectable down to about a tenth of a solar mass. By cross-correlating the eRASS1 source catalog with the Gaia EDR3 catalog, we arrive at a complete identification of the stellar (i.e., coronal) source content of eROSITA in the Sco-Cen association, and in particular obtain for the first time a 3D view of the detected stellar X-ray sources. Focusing on the low-mass population and placing the optical counterparts identified in this way in a color-magnitude diagram, we can isolate the young stars out of the detected X-ray sources and obtain age estimates of the various Sco-Cen populations. A joint analysis of the 2D and 3D space motions, the latter being available only for a smaller subset of the detected stellar X-ray sources, reveals that the space motions of the selected population show a high degree of parallelism, but there is also an additional population of young, X-ray emitting and essentially cospatial stars that appears to be more diffuse in velocity space. Its nature is currently unclear. We argue that with our procedures, an identification of almost the whole stellar content of the Sco-Cen association will become possible once the final Gaia and eROSITA catalogs are available by the end of this decade. We furthermore call into question any source population classification scheme that relies on purely kinematic selection criteria.

Abstract Copyright: © ESO 2022

Journal keyword(s): stars: activity - stars: coronae - stars: low-mass - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/661/A40): tablea1.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 47

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Number of rows : 47
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3226 0
2 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2883 0
3 NAME SEP reg 06 00 00.000 -66 33 38.55           ~ 148 0
4 IC 2391 OpC 08 41 10 -52 59.5           ~ 778 0
5 * eta Cha * 08 41 19.5125857944 -78 57 48.105898056 5.02 5.351 5.453     B8V 221 0
6 NAME eta Cha Association OpC 08 42 33 -78 57.8           ~ 342 0
7 IC 2602 OpC 10 42 27 -64 25.6           ~ 625 0
8 HD 95314 * 11 00 11.6928209664 -14 05 00.129016680   7.371 5.857     K5III 29 0
9 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1076 1
10 * 12 Mus RS* 11 39 29.59368 -65 23 51.9586   5.863 5.095 6.31   G5/8IIIp+A0/1V 159 1
11 ASAS J114452-6438.9 Y*O 11 44 52.1689804608 -64 38 54.909854772   13.23 11.96 11.86 10.413 K6IVe 8 0
12 CD-57 4328 Y*O 12 11 31.4224548744 -58 16 53.232914028   11.07 10.327   9.327 G9V(e) 14 0
13 CD-56 4401 Y*O 12 18 58.0240118448 -57 37 19.146216972   10.76 9.853   8.765 K1IV(e) 15 0
14 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 420 1
15 V* AF Cru EB* 12 19 07.1320577352 -63 09 53.994363480   10.76 9.80     G9V 13 0
16 CD-54 4763A * 12 24 20.6036574951 -54 43 53.158940792   10.97 10.36     ~ 2 0
17 CD-57 4497 Ro* 12 27 19.8913825272 -58 18 34.099436304   10.41 9.74 9.79 7.784 ~ 7 0
18 HD 111227 Y*O 12 48 07.7926675992 -44 39 16.795090548   10.54 9.844   8.786 K0IV(e) 20 0
19 NAME Cha II MoC 12 54 -77.2           ~ 317 0
20 * alf02 CVn a2* 12 56 01.6655889007 +38 19 06.155170512 2.44 2.76 2.88 2.98 3.05 A0VpSiEu 664 0
21 HD 112245 Or* 12 56 09.3962010432 -61 27 25.473461148   10.24 9.519   8.543 K0Ve 22 0
22 UCAC2 7537660 * 12 59 28.2375721056 -55 51 10.839744612   13.38 12.18 11.93 10.78 ~ 4 0
23 V* FK Com PM* 13 30 46.7996390256 +24 13 57.781233768   9.04 8.245   7.204 G4III 363 1
24 V* V851 Cen RS* 13 44 00.9212469648 -61 21 59.173175844   8.74 7.798   6.638 K0III 82 0
25 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2234 0
26 CD-52 6194 * 14 35 47.9642420328 -52 40 56.220771972   9.96 9.11     G7IIIe 4 0
27 CD-33 10212 * 14 59 44.6835128592 -34 25 46.716463524   12.24 10.80     K3Ve 6 0
28 CD-30 12142 Ro* 15 20 24.1532387952 -30 37 31.697495508   12.52 11.301 11.049 9.822 K4IVe 15 0
29 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 421 1
30 NAME RX J1531.5-3021AB Y*? 15 31 29.6075216064 -30 21 54.085468896           ~ 3 0
31 CD-31 12102A * 15 37 02.1369294264 -31 36 39.826568448   10.62 9.99 9.97 9.11 G6IV 11 0
32 CD-24 12231 Y*O 15 41 31.2136894680 -25 20 36.316420188   10.75 9.94     G9IVe 24 0
33 CD-22 11315 TT* 16 03 35.4984951600 -22 45 56.119524588   11.94 10.969 10.6 9.784 G9 29 0
34 2MASS J16053815-2039469 Y*O 16 05 38.1556045104 -20 39 46.942114212           M0.0e 7 0
35 THA 15-35 Or* 16 09 01.8486544824 -39 05 12.414717240   15.33 14.12 14.35 12.54 M5.5 90 0
36 Lupus 3 SFR 16 09.6 -39 03           ~ 306 0
37 HD 145208 Ro* 16 10 28.8804245352 -22 13 47.839440360   10.47 9.685   8.580 G7IV(e) 35 1
38 NAME Upper Sco Association As* 16 12 -23.4           ~ 1216 1
39 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1245 1
40 EM* SR 9 Or* 16 27 40.2857881416 -24 22 04.130226300   12.91 11.533 11.11 10.00 K5e 269 0
41 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3396 1
42 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1792 2
43 V* V1062 Sco a2* 16 38 30.9410484900 -39 09 08.389193766   6.92 6.95     ApSi 51 0
44 HD 151581 Ro* 16 49 44.5472127888 -36 24 22.261839300   9.13 8.174   6.949 G7III 14 0
45 CD-24 12932B PM* 16 54 51.2834874984 -24 55 32.564006148           ~ 1 0
46 LDN 1746 DNe 17 11.3 -27 22           ~ 126 0
47 PSR B1929+10 Psr 19 32 14.0570 +10 59 33.380           ~ 725 0

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2022.09.25-20:29:08

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