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

Full paper

View the references in ADS

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 - 2023	#notes
1	[VV2006] J001028.8+204749	QSO	00 10 28.74304373	+20 47 49.7884182			17.80	18.41		~	33	1
2	[D98] 52	*	01 15 20.4	+16 48 19						K0III	1	0
3	QSO J0225+1846	QSO	02 25 04.66884683	+18 46 48.7668666		20.0	20.0	19.09		~	90	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	36	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	49	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		M2V	8	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 57.2114503248	+31 14 19.076151444		10.73	9.98	9.1		G4V	102	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	1382	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		~	76	0
27	V* V988 Tau	BY*	04 23 22.8504016872	+19 39 31.317351336		10.290	9.381			K0	117	0
28	HD 285766	SB*	04 27 58.9605714552	+18 30 01.016034552		11.150	10.129			K2	42	0
29	HG 7-224	Er*	04 27 59.2152573288	+18 45 32.668898760		15.82	14.22			~	24	0
30	V* V1103 Tau	BY*	04 29 01.0133482776	+18 40 25.322063340		14.74	13.310	12.982		M2.5V	42	0
31	V* UX Tau A	TT*	04 30 03.9932216088	+18 13 49.469925504		12.92	11.15			K2Ve	346	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	345	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	11.436		~	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	37	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	22	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	11	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 04.81	+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 48.0	+24 53 07						M1.5V	1	0
67	2MASS J23035750+2500404	QSO	23 03 57.5091426816	+25 00 40.356769392						~	4	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			~	92	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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