1998A&AS..128..331D


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST01:20:15

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 - 2019
#notes
1 [VV2006] J001028.8+204749 QSO 00 10 28.7406020455 +20 47 49.786220683     17.80 18.41   ~ 23 1
2 [D98] 52 * 01 15 20.4 +16 48 19           K0III 1 0
3 QSO J0225+1846 QSO 02 25 04.6672463736 +18 46 48.759971912   20.0 20.0 19.09   ~ 69 1
4 [D98] 74 X 03 17 46.2 +10 17 35           ~ 1 0
5 1RXS J032037.9+112503 X 03 20 38.1 +11 24 55           ~ 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 04.1 +12 24 41           ~ 1 0
9 G 5-32 Fl* 03 23 22.4184564526 +11 41 13.361675606   13.76   11.840   M3.5V 32 0
10 [D98] 71 * 03 23 30.7 +10 48 00           K3 1 0
11 HD 21051 TT* 03 24 10.1285042920 +12 37 46.530455768   7.246 6.046     K0III-IV 43 0
12 [D98] 61 X 03 24 38.5504383038 +12 53 39.445826965           ~ 1 0
13 1RXS J032524.6+112801 X 03 25 25.3 +11 27 54           ~ 1 0
14 1RXS J032548.3+104658 X 03 25 48.3 +10 47 02           ~ 1 0
15 [ZEH2003] RX J0326.3+1131 3 TT* 03 26 21.2 +11 30 54   15.3       M2V 7 0
16 [D98] 65 * 03 26 46.1 +12 10 11           ~ 1 0
17 2MASS J03280248+1114231 TT* 03 28 02.48 +11 14 23.1           M3V 5 0
18 BD+30 547 Y*O 03 28 57.2107612240 +31 14 19.076624755   10.73 9.98 9.1   G4V 91 1
19 1RXS J032914.0+312252 X 03 29 14.3 +31 22 47           ~ 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 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1237 2
25 LP 415-636 Fl* 04 22 08.2466621967 +19 15 21.913009250   12.67 12.55 12.86   M3 22 0
26 [D98] 31 X 04 22 18.4 +19 50 47           ~ 1 0
27 V* V988 Tau BY* 04 23 22.8412094141 +19 39 31.555238662   10.290 9.381     K0 101 0
28 HD 285766 SB* 04 27 58.9656072462 +18 30 00.986997369   11.150 10.129     K2 33 0
29 LP 415-109 PM* 04 27 59.2151465521 +18 45 32.669188325   15.82 14.22     ~ 17 0
30 V* V1103 Tau BY* 04 29 01.0130224156 +18 40 25.320944701   14.74 13.310 12.982   M2.5V 32 0
31 V* UX Tau A TT* 04 30 03.9931880444 +18 13 49.476948664   12.92 11.15     K2Ve 320 0
32 V* UX Tau TT* 04 30 03.99626 +18 13 49.4355 11.23 11.84 10.80 9.83 9.05 K2Ve+M1Ve 307 0
33 6dFGS gJ043322.5-142229 AG? 04 33 22.5154315854 -14 22 28.623436083   18.52   17.31   ~ 3 0
34 BD-13 920 * 04 34 27.6532349101 -13 34 56.676961379   11.40 10.67     GV 2 0
35 2MASS J04352071-1454462 * 04 35 20.7168820775 -14 54 46.350101609           K7 5 0
36 2MASS J05203142-0548247 TT* 05 20 31.4341884852 -05 48 24.494718002     13.5     ~ 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 [D98] 7 * 09 37 28.13 +65 38 29.7           ~ 3 0
41 [D98] 90 X 13 58 17.3 -39 45 38           ~ 1 0
42 [D98] 87 * 15 19 18.5 -29 43 19           M0V 1 0
43 [D98] 84 X 15 37 06.6 -24 47 36           ~ 1 0
44 CD-26 10981 pr* 15 41 06.7902764961 -26 56 26.297838982   12.15 11.255 10.80 10.13 K1V 28 0
45 1RXS J154208.1-262924 X 15 42 08.6 -26 29 18           ~ 1 0
46 1RXS J155100.4-014149 X 15 51 00.7 -01 41 32           ~ 1 0
47 HD 142197 PM* 15 53 22.6709281876 -03 01 45.087156173 11.320 9.670 8.190     F5V 28 0
48 HD 151522 * 16 44 20.6130849338 +59 57 48.997452150   9.08 8.39     G5 15 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 33.6 +61 39 47           ~ 1 0
52 1RXS J165814.5+605608 X 16 58 14.5 +60 56 15           ~ 1 0
53 1RXS J165832.4+615940 X 16 58 32.5 +61 59 46           ~ 1 0
54 2MASS J16595894+6202181 Sy1 16 59 58.9388728611 +62 02 18.172723202   18.08 17.86     ~ 23 0
55 1RXS J165959.2+621444 X 16 59 59.3 +62 14 45           ~ 1 0
56 [D98] 10 * 17 01 12.1 +62 06 31           ~ 2 0
57 [D98] 89 X 19 15 11.2 -36 47 17           ~ 1 0
58 HD 180802 PM* 19 19 31.0040286859 -36 39 30.715458594   7.73 7.26     F7V 18 1
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 22.8082462436 +81 04 48.803341004   9.75 9.08     G5 10 0
62 1RXS J215905.5+822631 X 21 59 11.9 +82 26 22           ~ 1 0
63 [D98] 26 * 22 59 26.9 +24 40 54           K3 1 0
64 NVSS J230004+244447 Rad 23 00 04.81 +24 44 48.6           ~ 3 1
65 [D98] 27 X 23 02 10.9 +24 17 35           ~ 1 0
66 1RXS J230248.0+245307 * 23 02 47.6 +24 53 14           M1.5V 1 0
67 2MASS J23035750+2500404 AG? 23 03 57.5093717914 +25 00 40.355904122           ~ 2 0
68 1RXS J230426.4+125833 X 23 04 26.3 +12 58 41           ~ 1 0
69 1RXS J230452.4+141236 X 23 04 52.0 +14 12 41           ~ 1 0
70 1RXS J230458.2+134319 X 23 04 57.8 +13 43 28           ~ 1 0
71 SDSS J230520.38+131555.0 QSO 23 05 20.3876210130 +13 15 55.144832079   19.99 19.61     ~ 13 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 2MASX J23074560+1901207 Sy1 23 07 45.6251138318 +19 01 20.504897265   17.63 17.50     ~ 85 1
75 [D98] 38 X 23 07 47.1 +19 02 46           ~ 1 0
76 1RXS J230812.9+193020 X 23 08 12.4 +19 30 09           ~ 1 0
77 1RXS J230828.5+155541 X 23 08 28.2 +15 55 46           ~ 1 0
78 [D98] 51 X 23 08 41.7 +17 49 02           ~ 1 0
79 CCDM J23087+1533AB ** 23 08 42.929 +15 32 54.10   10.44 9.77 9.16   G0 6 0
80 1RXS J230902.3+233131 X 23 09 01.8 +23 31 35           ~ 1 0
81 BD+17 4873 * 23 09 02.6635564025 +18 20 30.994744319   10.62 9.59     G5 2 0
82 HD 218602 * 23 09 07.4319303607 +18 24 36.682242022   9.38 8.81     G5 17 0
83 [D98] 29 X 23 09 44.8 +22 34 18           ~ 1 0
84 1RXS J231100.0+180823 * 23 10 59.8 +18 08 29           ~ 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 14.8340644230 +33 14 04.237007324   12.49 11.41     K3 2 0
89 1RXS J232526.0+331223 * 23 25 25.9 +33 12 44           K3 1 0
90 1RXS J232557.2+331725 X 23 25 57.5 +33 17 19           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-01:20:15

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