SIMBAD references

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.


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: 50

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