2010ApJ...719..691F

Query : 2010ApJ...719..691F

2010ApJ...719..691F - Astrophys. J., 719, 691-699 (2010/August-2)

Nothing to hide: an X-ray survey for young stellar objects in the Pipe nebula.

FORBRICH J., POSSELT B., COVEY K.R. and LADA C.J.

Abstract (from CDS):

We have previously analyzed sensitive mid-infrared observations to establish that the Pipe Nebula (PiN) has a very low star formation efficiency. That study focused on young stellar objects (YSOs) with excess infrared emission (i.e., protostars and pre-main-sequence stars with disks), however, and could have missed a population of more evolved pre-main-sequence stars or Class III objects (i.e., young stars with dissipated disks that no longer show excess infrared emission). Evolved pre-main-sequence stars are X-ray bright, so we have used ROSAT All-Sky Survey data to search for diskless pre-main-sequence stars throughout the PiN. We have also analyzed archival XMM-Newton observations of three prominent areas within the Pipe: Barnard 59 (B 59), containing a known cluster of YSOs; Barnard 68, a dense core that has yet to form stars; and the Pipe molecular ring, a high-extinction region in the bowl of the Pipe. We also characterize the X-ray properties of YSOs in B 59. The ROSAT and XMM-Newton data provide no indication of a significant population of more evolved pre-main-sequence stars within the Pipe, reinforcing our previous measurement of the Pipe's very low star formation efficiency.

Abstract Copyright: ∼

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

Simbad objects: 43

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Number of rows : 43
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 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1393 1
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4418 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2332 0
4 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 806 0
5 NAME Lupus Complex SFR 16 03 -38.1           ~ 720 0
6 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1
7 2XMMi J171059.9-272543 X 17 10 59.9 -27 25 43           ~ 1 0
8 2MASS J17110392-2722551 Y*? 17 11 03.9294631032 -27 22 55.199684244           ~ 15 0
9 2MASS J17110411-2722593 ** 17 11 04.1139442152 -27 22 59.489143068           ~ 9 0
10 2MASS J17111182-2726547 Y*? 17 11 11.8258200936 -27 26 54.938099220           ~ 10 0
11 2XMMi J171113.1-272936 X 17 11 13.1 -27 29 36           ~ 1 0
12 2MASS J17111445-2726543 Y*? 17 11 14.4538872552 -27 26 54.414702060           ~ 7 0
13 2MASS J17111626-2720287 LP* 17 11 16.2599670036 -27 20 28.865521449           ~ 7 0
14 2MASS J17111631-2725144 Y*? 17 11 16.3136421264 -27 25 14.615065668     16.5     ~ 12 0
15 EM* LkHA 346 Y*O 17 11 17.2853820264 -27 25 08.241647988   15       ~ 37 1
16 2XMMi J171117.5-272535 X 17 11 17.5 -27 25 35           ~ 1 0
17 LDN 1746 DNe 17 11.3 -27 22           ~ 138 0
18 2MASS J17111827-2725491 Y*? 17 11 18.28 -27 25 49.1           ~ 9 0
19 IRAS 17082-2724 Y*O 17 11 21.5353660152 -27 27 41.846549184           ~ 15 0
20 [BHB2007] 10 Y*O 17 11 22.18 -27 26 02.0           ~ 21 0
21 2MASS J17112317-2724315 ** 17 11 23.17752 -27 24 31.5288           ~ 76 0
22 2MASS J17112508-2724425 Y*? 17 11 25.08 -27 24 42.5           ~ 9 0
23 2MASS J17112701-2723485 Y*? 17 11 27.0122462664 -27 23 48.598921788           ~ 16 0
24 2MASS J17112729-2725283 Y*? 17 11 27.2902600728 -27 25 28.521910992           ~ 10 0
25 2MASS J17112942-2725367 Y*? 17 11 29.4209399616 -27 25 36.936693480           ~ 7 0
26 2MASS J17113036-2726292 Y*? 17 11 30.3704451840 -27 26 29.264689248           ~ 7 0
27 IRAS 17085-2715 Mi* 17 11 40.9842531864 -27 18 36.941917752         16.979 ~ 6 0
28 THA 27-5 Y*? 17 11 41.8335030168 -27 25 47.583314832   15.88 14.27 13.94   ~ 14 0
29 2MASS J17114315-2730584 Y*? 17 11 43.1547515544 -27 30 58.499145684           ~ 4 0
30 2XMMi J171148.0-272633 X 17 11 48.0 -27 26 33           ~ 1 0
31 2XMMi J171149.9-272050 X 17 11 49.9 -27 20 50           ~ 1 0
32 2XMMi J171153.2-273607 X 17 11 53.2 -27 36 07           ~ 1 0
33 EM* LkHA 347 Y*? 17 12 00.1996719552 -27 20 18.072311352   15       ~ 15 0
34 2XMMi J171214.1-272140 X 17 12 14.1 -27 21 40           ~ 1 0
35 2XMMi J171231.5-271847 X 17 12 31.5 -27 18 47           ~ 1 0
36 1RXS J172236.0-235938 X 17 22 36.0 -23 59 38           ~ 1 0
37 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 314 1
38 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 403 1
39 1RXS J173319.3-255416 X 17 33 19.3 -25 54 16           ~ 3 0
40 2XMMi J173400.2-253746 X 17 34 00.2 -25 37 46           ~ 1 0
41 2XMMi J173402.6-255219 X 17 34 02.6 -25 52 19           ~ 1 0
42 DCld 001.6+03.8 DNe 17 35 47.50 -25 32 59.0           ~ 60 0
43 NAME Galactic Bulge reg ~ ~           ~ 4299 0

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