1997A&A...320..783C

Query : 1997A&A...320..783C

1997A&A...320..783C - Astronomy and Astrophysics, volume 320783-786 (1997/4-3)

Is RX J1856.5-3754 an old neutron star?

CAMPANA S., MEREGHETTI S. and SIDOLI L.

Abstract (from CDS):

An unusual X-ray source, RX J1856.5-3754, has recently been discovered with ROSAT: its spectrum resembles that of supersoft sources, but the very high X-ray to optical flux ratio excludes the presence of a companion star, pointing to an isolated compact object. It has been proposed that RX J1856.5-3754 is an old, isolated neutron star accreting from the interstellar medium. Here we present a reanalysis of the ROSAT data. The HRI observation reveals an attitude reconstruction problem, resulting in a larger error box than previously reported. Deeper optical observations allow us to reveal a few optical counterparts inside the new error box, but the X-ray to optical flux ratio is still very high (>20) and none of the candidates has peculiar colors.

Abstract Copyright: ∼

Journal keyword(s): stars: individual: RX J1856.5-3754 - accretion - X-rays: stars - stars: neutron

Nomenclature: Table 1: CMS NN (Nos 1-33)

Simbad objects: 35

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Number of rows : 35
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 CMS 30 * 08 56 34.899 -37 54 24.11   19.61 18.92     ~ 10 0
2 WWN F * 18 56 34.5389054040 -37 54 35.078190444   17.5 17.45 16.9 16.17 G9/K0III/V 8 0
3 RX J1856.6-3754 Psr 18 56 35.11 -37 54 30.5     25.7     ~ 456 0
4 CMS 23 * 18 56 35.1855 -37 54 36.142     24.41     ~ 9 0
5 CMS 15 * 18 56 35.221 -37 54 46.66   19.39 18.72     ~ 10 0
6 CMS 27 * 18 56 35.408 -37 54 27.76   22.03 21.18     ~ 11 0
7 WWN C * 18 56 35.4450316320 -37 54 49.817253996   17.2 18.21 16.6 16.89 G6/8III/V 10 0
8 WWN L * 18 56 35.7450334032 -37 54 25.075156860   18.18 17.75 15.9 16.51 G3/6III/V 9 0
9 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 554 0
10 CMS 7 * ~ ~           ~ 1 0
11 CMS 9 * ~ ~           ~ 1 0
12 CMS 10 * ~ ~           ~ 1 0
13 CMS 11 * ~ ~           ~ 1 0
14 CMS 13 * ~ ~           ~ 1 0
15 CMS 16 * ~ ~           ~ 1 0
16 CMS 18 * ~ ~           ~ 1 0
17 CMS 19 * ~ ~   23.59 22.40     ~ 6 0
18 CMS 21 * ~ ~   23.50 21.54     ~ 8 0
19 CMS 25 * ~ ~   23.73 22.24     ~ 4 0
20 CMS 29 * ~ ~           ~ 1 0
21 CMS 32 * ~ ~           ~ 1 0
22 CMS 6 * ~ ~           ~ 1 0
23 CMS 33 * ~ ~   16.03 15.69     ~ 5 0
24 CMS 20 G ~ ~     23.92     ~ 5 1
25 CMS 24 * ~ ~   22.67 20.85     ~ 7 0
26 CMS 26 * ~ ~   23.07 21.84     ~ 7 0
27 CMS 5 * ~ ~           ~ 1 0
28 CMS 4 * ~ ~           ~ 1 0
29 CMS 8 * ~ ~           ~ 1 0
30 CMS 12 * ~ ~           ~ 1 0
31 CMS 17 * ~ ~     24.52     ~ 3 0
32 CMS 28 * ~ ~   23.05 22.05     ~ 8 0
33 CMS 3 * ~ ~           ~ 1 0
34 CMS 2 * ~ ~           ~ 1 0
35 CMS 1 * ~ ~           ~ 1 0

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