1998A&AS..128..331D

Query : 1998A&AS..128..331D

1998A&AS..128..331D - Astron. Astrophys., Suppl. Ser., 128, 331-348 (1998/March-1)

Searching for old neutron stars with ROSAT. I. Soft X-ray sources in molecular clouds at high galactic latitude.

DANNER R.

Abstract (from CDS):

This is the first in a series of three papers aiming to put strong observational constraints on the number of old accreting neutron stars in the Galaxy. Old neutron stars have been predicted to be visible as soft X-ray sources. The brightest sources are expected where the density of the interstellar medium is high. I present an X-ray survey of a complete sample of molecular clouds at high galactic latitudes based on the ROSAT All-Sky Survey. I detect 89 sources inside the projected contours of the molecular clouds and report on a comprehensive identification program. For all sources I searched astronomical catalogs and created finding charts. I also observed all sources at radio frequencies, most of them at 1.4GHz and at 8GHz. For sources with bright counterparts, optical spectra are presented. For fainter sources, optical CCD images are shown. Of all sources, 54 are securely identified and for the majority of the remaining sources likely identifications are given. I find no candidate for an old accreting neutron star in this sample. From this survey I derive an upper limit to the neutron star density of 50sr–1 at a ROSAT count rate of 0.012s–1.

Abstract Copyright: ∼

Journal keyword(s): surveys - stars: neutron - white dwarfs - X-rays: stars - radio continuum: stars

VizieR on-line data: <Available at CDS (J/A+AS/128/331): table2 figs >

Nomenclature: Table 2: [D98] NN (Nos 1-90) N=89, No. 41 missing

Simbad objects: 90

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Number of rows : 90
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 [VV2006] J001028.8+204749 QSO 00 10 28.74304373 +20 47 49.7884182     17.80 18.41   ~ 56 1
2 [D98] 52 * 01 15 20.4 +16 48 19           K0III 1 0
3 QSO J0225+1846 Bla 02 25 04.66884683 +18 46 48.7668666   20.0 20.0 19.09   ~ 105 1
4 [D98] 74 X 03 17 46.2 +10 17 35           ~ 1 0
5 1RXS J032037.9+112503 X 03 20 37.9 +11 25 03           ~ 2 0
6 [D98] 63 X 03 22 02.5 +12 28 45           ~ 1 0
7 [D98] 73 * 03 22 44.3 +10 37 28           M4V 1 0
8 1RXS J032303.9+122449 X 03 23 03.9 +12 24 49           ~ 1 0
9 G 5-32 Er* 03 23 22.4185912464 +11 41 13.354333008   13.76   11.840   M3.5Ve 38 0
10 [D98] 71 * 03 23 30.7 +10 48 00           K3 1 0
11 HD 21051 TT* 03 24 10.1286587232 +12 37 46.532952372   7.246 6.046     K0III-IV 50 0
12 [D98] 61 X 03 24 38.5507329216 +12 53 39.450401880           ~ 1 0
13 1RXS J032524.6+112801 X 03 25 24.6 +11 28 01           ~ 1 0
14 1RXS J032548.3+104658 X 03 25 48.3 +10 46 58           ~ 1 0
15 RX J0326.3+1131A TT* 03 26 21.2583233856 +11 30 54.139731508   15.406 14.442 14.795   M2Ve 9 0
16 [D98] 65 * 03 26 46.1 +12 10 11           ~ 1 0
17 RX J0328.0+1114 TT* 03 28 02.48 +11 14 23.1   17.035 15.385 15.246   M3Ve 5 0
18 BD+30 547 Y*O 03 28 57.2114503248 +31 14 19.076151444   10.73 9.98 9.1   G4V 108 1
19 1RXS J032914.0+312252 X 03 29 14.0 +31 22 52           ~ 1 0
20 [VV2000] J040110.8+000413 Sy1 04 01 10.2 +00 04 02   18.35 18.03     ~ 6 1
21 [ATZ98] A109 Sy1 04 02 42.2 +02 00 07   18.53 17.68     ~ 5 1
22 [D98] 75 X 04 03 14.3 +02 15 21           ~ 1 0
23 [D98] 33 * 04 21 45.8 +19 34 01           M1.5V 1 0
24 V* T Tau TT* 04 21 59.4319873992 +19 32 06.432393336   11.22 10.12 9.80   K0IV/Ve 1404 1
25 LP 415-636 Er* 04 22 08.2467305544 +19 15 21.911057100   12.67 12.55 12.86   M3.0 25 0
26 QSO B0419+19 BLL 04 22 18.6125654952 +19 50 46.908625740       18.6   ~ 84 0
27 V* V988 Tau BY* 04 23 22.8504016872 +19 39 31.317351336   10.290 9.381     K0 123 0
28 HD 285766 SB* 04 27 58.9605714552 +18 30 01.016034552   11.150 10.129     K2 45 0
29 HG 7-224 Er* 04 27 59.2152573288 +18 45 32.668898760   15.82 14.22     ~ 27 0
30 V* V1103 Tau BY* 04 29 01.0133482776 +18 40 25.322063340   14.751 13.310 12.982   M2.5V 48 0
31 V* UX Tau A TT* 04 30 03.9932216088 +18 13 49.469925504   12.92 11.15     K2Ve 356 0
32 V* UX Tau Or* 04 30 03.99626 +18 13 49.4355 11.23 11.84 10.80 9.83 9.05 K2Ve+M1Ve 355 0
33 2MASS J04332250-1422287 AG? 04 33 22.5153970536 -14 22 28.625026548   18.52   17.31   ~ 3 0
34 BD-13 920 SB* 04 34 27.6532523256 -13 34 56.678281104   11.40 10.67     GV 3 0
35 2MASS J04352071-1454462 * 04 35 20.7168528264 -14 54 46.349044848           K7 5 0
36 EM* StHA 39 TT* 05 20 31.4286972864 -05 48 24.468692724   12.816 11.754 11.086 10.518 ~ 8 1
37 [D98] 8 X 09 29 49.3 +65 22 53           ~ 1 0
38 [D98] 5 X 09 32 16.0 +70 06 35           ~ 1 0
39 [D98] 6 * 09 34 17.5 +66 21 50           K0III 1 0
40 2MASS J09372812+6538296 Sy1 09 37 28.1303297256 +65 38 29.715257832   19.57 19.15     ~ 14 0
41 [D98] 90 X 13 58 17.3 -39 45 38           ~ 1 0
42 1RXS J151917.7-294331 Y*? 15 19 18.0624113496 -29 43 20.407920312       12.79   K7IVe 4 0
43 [D98] 84 X 15 37 06.6 -24 47 36           ~ 1 0
44 CD-26 10981 Y*O 15 41 06.7900964808 -26 56 26.297161368   12.15 11.255 10.80 10.13 K1V 38 0
45 1RXS J154208.1-262924 X 15 42 08.1 -26 29 24           ~ 1 0
46 1RXS J155100.4-014149 X 15 51 00.4 -01 41 49           ~ 1 0
47 HD 142197 PM* 15 53 22.6709715624 -03 01 45.079193604 11.320 9.670 8.190     F5V 37 0
48 HD 151522 * 16 44 20.6117719416 +59 57 48.999558996   9.08 8.39     G5 23 0
49 [D98] 15 X 16 44 35.3 +59 58 43           ~ 1 0
50 [D98] 17 * 16 45 46.23 +59 57 35.1           ~ 2 0
51 1RXS J165534.3+613940 X 16 55 34.3 +61 39 40           ~ 1 0
52 1RXS J165814.5+605608 X 16 58 14.5 +60 56 08           ~ 1 0
53 1RXS J165832.4+615940 X 16 58 32.4 +61 59 40           ~ 1 0
54 2MASS J16595894+6202181 Sy1 16 59 58.9386076488 +62 02 18.172144068   18.08 17.86     ~ 30 0
55 1RXS J165959.2+621444 X 16 59 59.2 +62 14 44           ~ 1 0
56 [D98] 10 * 17 01 12.1 +62 06 31           ~ 3 0
57 [D98] 89 X 19 15 11.2 -36 47 17           ~ 1 0
58 HD 180802 PM* 19 19 31.0041187992 -36 39 30.715065180   7.73 7.27 8.26   F7V 24 0
59 [D98] 4 * 19 23 26.1 +70 07 48           K6.5 1 0
60 [D98] 3 * 19 24 05.8 +70 19 56           ~ 1 0
61 BD+80 670 PM* 20 45 22.7838667176 +81 04 48.821495376   9.75 9.08     G5 12 0
62 1RXS J215905.5+822631 X 21 59 05.5 +82 26 31           ~ 1 0
63 [D98] 26 * 22 59 26.9 +24 40 54           K3 1 0
64 NVSS J230004+244447 Rad 23 00 04.8 +24 44 49           ~ 4 1
65 [D98] 27 X 23 02 10.9 +24 17 35           ~ 1 0
66 1RXS J230248.0+245307 * 23 02 48.0 +24 53 07           M1.5V 1 0
67 2MASS J23035750+2500404 QSO 23 03 57.5091426816 +25 00 40.356769392           ~ 5 0
68 1RXS J230426.4+125833 X 23 04 26.4 +12 58 33           ~ 1 0
69 1RXS J230452.4+141236 X 23 04 52.4 +14 12 36           ~ 1 0
70 1RXS J230458.2+134319 X 23 04 58.2 +13 43 19           ~ 1 0
71 1RXS J230519.9+131534 QSO 23 05 20.3910948192 +13 15 55.149723144   19.99 19.61     ~ 17 0
72 [D98] 55 * 23 05 31.2 +15 14 50           ~ 1 0
73 [D98] 56 X 23 05 58.6 +14 13 25           ~ 1 0
74 ICRF J230745.6+190120 Sy1 23 07 45.6261512472 +19 01 20.501225328   17.63 17.50     ~ 94 1
75 [D98] 38 X 23 07 47.1 +19 02 46           ~ 1 0
76 1RXS J230812.9+193020 X 23 08 12.9 +19 30 20           ~ 1 0
77 1RXS J230828.5+155541 X 23 08 28.5 +15 55 41           ~ 1 0
78 [D98] 51 X 23 08 41.7 +17 49 02           ~ 1 0
79 HD 218539 ** 23 08 42.9360020529 +15 32 54.334966988   9.94 9.40 9.35   G0 6 0
80 1RXS J230902.3+233131 X 23 09 02.3 +23 31 31           ~ 1 0
81 BD+17 4873 * 23 09 02.6634616632 +18 20 30.996221064   10.62 9.59     G5 3 0
82 HD 218602 * 23 09 07.4317029504 +18 24 36.689400900   9.38 8.81     G5 23 0
83 [D98] 29 X 23 09 44.8 +22 34 18           ~ 1 0
84 1RXS J231100.0+180823 * 23 11 00.0 +18 08 23           ~ 1 0
85 [D98] 45 X 23 11 02.8 +18 28 20           ~ 1 0
86 [D98] 50 X 23 12 31.3 +18 06 23           ~ 1 0
87 [D98] 36 * 23 12 36.7 +19 23 03           ~ 1 0
88 TYC 2769-370-1 PM* 23 25 14.8340289552 +33 14 04.238705400   12.49 11.41     K3 2 0
89 1RXS J232526.0+331223 * 23 25 26.0 +33 12 23           K3 1 0
90 1RXS J232557.2+331725 X 23 25 57.2 +33 17 25           ~ 1 0

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