1998A&AS..128..349D

Query : 1998A&AS..128..349D

1998A&AS..128..349D - Astron. Astrophys., Suppl. Ser., 128, 349-357 (1998/March-1)

Searching for old neutron stars with ROSAT. II. Soft X-ray sources in galactic dark clouds.

DANNER R.

Abstract (from CDS):

This is the second in a series of three papers constraining the number of detectable old neutron stars in the Galaxy. Here, I present the statistical analysis of a sample of X-ray sources coincident with areas of dark clouds in the Galactic plane. I compare this sample with all sources in the ROSAT All-Sky Survey bright source catalog within 20° of the Galactic plane. I present the results of an identification program of a subset of sources that are compatible with a soft, thermal X-ray spectrum and an effective source temperature of less than 70eV. The three brightest sources in this sample form an intriguing subgroup. One of them is a previously identified candidate for an accreting neutron star. I identify the other two sources with hot white dwarf stars. I find no new accreting neutron star candidate in this sample. Based on this result, I derive an upper limit to the space density of accreting neutron stars in fields of Galactic dark clouds of ∼2sr–1 at a count rate >0.05s–1.

Abstract Copyright: ∼

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

Nomenclature: [D98] RX JHHMM.m+DDMM A N=8

CDS comments: Table 1: Cloud A, B, C = [DT85] Cloud A, B, C. G 317-4 = DCld 317.0-04.1

Simbad objects: 49

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Number of rows : 49
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Ass Per OB 2 As* 03 42.2 +33 26           ~ 350 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
3 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
4 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
5 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 715 1
6 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
7 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
8 [D98] RX J0550.6+0005 A * 05 50.6 +00 05           ~ 1 0
9 [D98] RX J0550.6+0005 B X 05 50.6 +00 05           ~ 1 0
10 GD 257 WD* 05 50 37.5195849864 +00 05 52.623285612   14.80 15.10 15.1   DA1.1 72 0
11 2MASS J06045871-0707015 AG? 06 04 58.7224723992 -07 07 01.606351080           ~ 2 1
12 [D98] RX J0605.0-0707 A AGN 06 04 58.9 -07 07 06           ~ 1 0
13 Ass Mon R 2 As* 06 07 47.8 -06 22 55           ~ 47 1
14 HD 43066 * 06 13 57.1031729904 -07 14 53.069955792   6.76 6.77     A0V 20 0
15 RX J0620.2-0904 X 06 20 11.4 -09 04 14           ~ 3 1
16 [D98] RX J0620.2-0904 A * 06 20 11.5 -09 04 20           MV:e 1 0
17 [D98] RX J0620.2-0904 B Em* 06 20.2 -09 04           ~ 1 0
18 HD 45759 * 06 29 36.8845280688 +08 29 32.764396884   8.16 7.61     F8 45 0
19 NAME Mon I MoC 06 35 +10.1           ~ 268 0
20 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 887 0
21 HD 103673 * 11 55 57.0811360224 -77 00 30.271664088   9.28 8.60     G5V 28 0
22 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 275 0
23 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1407 1
24 Sandqvist 171 Cld 15 02.5 -63 21           ~ 5 0
25 DCld 317.0-04.1 DNe 15 02 37 -63 21.1           ~ 17 0
26 HD 147553 ** 16 23 56.71426 -33 11 57.8305   6.47 6.46     B9.5V(n)+A1V(n) 59 0
27 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
28 NAME Aql Rift DNe 18 32 -01.0           ~ 355 1
29 RX J1856.6-3754 Psr 18 56 35.11 -37 54 30.5     25.7     ~ 456 0
30 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 554 0
31 V* RS Vul SB* 19 17 39.9925726776 +22 26 28.364271900   6.91 6.85     B2-5V-IV 182 0
32 RX J1920.9+1903 * 19 20 53 +19 03.3           MV:e 5 1
33 RX J1922.7+0950 EB* 19 22 41.694144 +09 50 56.76432   11.47 10.60 10.34 9.514 G 5 0
34 NAME Vul Rift MoC 19 36 53 +23 04.7           ~ 27 0
35 RX J1947.4+3045 WD* 19 47 24.2931802320 +30 45 55.236898692   17.4   17.1   DA 6 0
36 RX J1958.6+7218 X 19 58 34.2 +72 18 24           ~ 1 0
37 [D98] RX J1958.6+7218 B * 19 58.6 +72 18           ~ 1 0
38 [D98] RX J1958.6+7218 A * 19 58.6 +72 18           ~ 1 0
39 HD 192020 PM* 20 11 25.1177128056 +38 24 00.499496688   8.84 7.96     G8V 72 0
40 RX J2019.6+4048 X 20 19 38.9 +40 48 25           ~ 1 0
41 NAME Northern Coalsack DNe 20 21 +37.0           ~ 124 0
42 Ass Cyg OB 7 As* 21 08 +47.6           ~ 218 0
43 RX J2114.6+4607 X 21 14 33.7 +46 07 45           ~ 1 0
44 NAME Cepheus Cloud SFR 22 00.0 +76 30           ~ 165 0
45 NAME Vela Sheet Cld ~ ~           ~ 14 0
46 NAME Vul B Cld ~ ~           ~ 10 0
47 NAME Vul C Cld ~ ~           ~ 4 0
48 NAME Great Rift reg ~ ~           ~ 18 0
49 NAME Vul A Cld ~ ~           ~ 7 0

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