2003A&A...405..149F

Query : 2003A&A...405..149F

2003A&A...405..149F - Astronomy and Astrophysics, volume 405, 149-163 (2003/7-1)

Further identification of ROSAT all-sky survey sources in Orion.

FRASCA A., ALCALA J.M., COVINO E., CATALANO S., MARILLI E. and PALADINO R.

Abstract (from CDS):

We report on the identification of 22 ROSAT All-Sky Survey (RASS) X-ray sources distributed in the general direction of the Orion star-forming region. The X-ray sample contains sources from the ROSAT bright source catalogue and from previous detections. The optical identifications are based on intermediate-resolution spectroscopy and UBV Johnson photometry using a 1m-class telescope. The strengths of the Hα, NaID2 and lithium lines for the stellar counterparts are evaluated applying the spectral subtraction technique, using templates of the same spectral type. Radial velocities of the optical counterparts are also reported. Thirteen of the optical counterparts show the lithium absorption line in their spectra and have radial velocities consistent with the Orion star forming region. Four of these objects can be classified as new bona-fide T Tauri stars.

Abstract Copyright: ∼

Journal keyword(s): X-ray: stars - stars: pre-main-sequence - stars: low-mass, brown dwarfs - stars: activity - ISM: individual objects: Orion - stars: formation

Simbad objects: 48

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Number of rows : 48
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 * alf Ari PM* 02 07 10.40570 +23 27 44.7032 4.29 3.17 2.01 1.15 0.54 K2-IIIbCa-1 622 2
2 HD 31799 * 04 58 36.8869657320 -04 33 33.349966452   8.18 8.08 8.2   A1V 20 0
3 HD 31766 * 04 58 53.0281472472 +08 58 28.009832196   8.49 8.43     A0 15 0
4 V* MR Eri RS* 05 00 40.8795641323 -04 56 16.204804083   10.54 10.01 10.3   F9V 5 0
5 LP 476-207 SB* 05 01 58.79419 +09 58 59.2855   12.93 11.53 10.33 8.708 M3.5V 118 0
6 2MASS J05022084-0744099 TT* 05 02 20.8460227728 -07 44 09.993564276   11.94 11.30     G7 9 0
7 V* V1843 Ori RS* 05 03 05.8890702768 +05 48 40.128978276   11.31 10.61     G2V 4 0
8 RX J0503.2+0841 ** 05 03 14.713992 +08 40 41.97000   12.673 11.638 11.010   ~ 2 0
9 HD 32420 * 05 03 28.6789225344 +09 01 42.362389884   9.62 9.55     A0 9 0
10 HD 32925 Pu* 05 06 24.1032080808 -06 18 50.326965144   9.54 9.21     B8.5VSi 24 0
11 2MASS J05104050-0316415 TT* 05 10 40.4948070288 -03 16 41.570053284 12.11 12.01 11.38   10.57 G2 7 0
12 IRAS 05092-0814 FIR 05 11 39.1 -08 10 38           ~ 1 0
13 RX J0511.7-0809 * 05 11 41.8 -08 09 12           K2/K3V 1 0
14 1RXS J051523.9-091234 * 05 15 23.9 -09 12 34           G2V 2 0
15 TYC 5331-87-1 * 05 16 31.3184381880 -08 05 16.120248612   11.88 11.25     G3V 2 0
16 BD-09 1112 * 05 17 00.7271407320 -09 07 12.253613772   10.35 9.66     G0 6 0
17 V* V1855 Ori TT* 05 17 54.4112840016 -07 08 19.373753148   11.64 10.695   9.714 K2e 28 0
18 HD 34639 * 05 18 46.0351331784 -09 02 42.303647364   9.59 9.61     B9III/IV 11 0
19 HD 34814 * 05 19 51.8837407800 -07 07 57.403233264   9.09 9.10     A0 18 0
20 HD 35225 * 05 22 52.6659755304 -08 05 14.060613768   8.76 8.56     A3III 19 0
21 TYC 5332-283-1 * 05 23 02.6214244272 -07 42 00.886747032   11.70 11.17     F9V 2 0
22 1RXS J052345.0-075343 * 05 23 45.0 -07 53 43           K5V 4 0
23 V* V1862 Ori ** 05 24 22.07616 -06 39 16.2144           G5III/IV 4 0
24 HD 35718 * 05 26 28.8701262456 -05 38 44.461734036   8.76 8.74     A0V 20 0
25 HD 290521 * 05 29 50.2639607088 -01 02 08.978170632   10.24 10.16     A3 14 0
26 V* V1876 Ori RS* 05 30 05.1821955408 +00 41 20.307009516   10.13 9.574   8.781 G0 14 0
27 HD 290517 V* 05 30 10.2018386856 -01 01 40.971783468   8.95 8.98     A0 18 0
28 HD 290516 * 05 30 16.4959657344 -00 53 29.437632816   9.47 9.51     B9Vbn 15 0
29 1RXS J053114.3-092237 Ro* 05 31 14.1715108656 -09 22 30.620967816   11.127 10.525 10.456 9.492 F9V 7 0
30 HD 36513 * 05 31 51.2304967680 -07 42 58.199150700   9.55 9.53     B9V 22 0
31 V* V730 Ori TT* 05 33 44.7225964056 -05 21 03.964997880   14.88 13.79 13.54   F9V: 20 0
32 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 266 0
33 HD 36867 * 05 34 24.5931018336 -07 23 21.959824848   9.30 9.33     B9/9.5V 25 0
34 V* V2087 Ori Or* 05 34 57.6264662736 -06 18 31.211722692 12.15 11.93 11.23 10.83 10.445 G1.0 33 0
35 NAME lam Ori Cloud Cld 05 35 06 +09 56.0           ~ 64 0
36 NAME lam Ori Complex SFR 05 35 06 +09 56.0           ~ 79 0
37 M 42 HII 05 35 17 -05 23.4           ~ 4077 0
38 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 137 1
39 Brun 950 Y*O 05 36 06.3132811104 -05 41 56.632874424   14.2 11.695 13.8 10.688 G3V 24 0
40 NAME Ori I As* 05 38 -02.8           ~ 615 0
41 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 567 0
42 HD 39161 * 05 50 28.6226449992 -04 58 37.470323208   9.06 8.95     A1V 19 0
43 RX J0551.5-0628 * 05 51 30.4 -06 28 57           F9V 1 0
44 RX J0558.6-0311 Ro* 05 58 41.6637317325 -03 11 02.973909664   12.593 11.598 11.345   ~ 3 0
45 HD 40534 * 05 59 14.6066936472 -04 21 33.535654164   9.08 9.09     B9V 17 0
46 V* Z CMa Ae* 07 03 43.1599411656 -11 33 06.209065836 10.51 9.99 8.80     B5/8eq+F5/7 578 3
47 * omi Aql PM* 19 51 01.6436960928 +10 24 56.592457524   5.66   4.8   F8V 455 0
48 Ass Ori OB 1a As* ~ ~           ~ 230 0

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