1999A&A...347..473G

Query : 1999A&A...347..473G

1999A&A...347..473G - Astronomy and Astrophysics, volume 347473-477 (1999/7-2)

The peculiar M giant HD 154791, optical counterpart of the X-ray source 4U1700+24.

GAUDENZI S. and POLCARO V.F.

Abstract (from CDS):

HD 154791 is the only optical counterpart of an hard X-ray source (4U 1700+24) with an apparently normal M giant spectrum. We present here new high S/N spectroscopic observations of this interesting and poorly studied object, pointing out a number of peculiarities never noticed before; therefore we derive a possible scenario involving a wide binary system, where an old, slowly rotating, neutron star is weekly interacting with its late optical companion. We foresee that this system could evolve, in a short time, into a normal LMXB.

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Journal keyword(s): line: identification - stars: evolution - stars: individual: HD 154791 - stars: late-type - stars: neutron - X-rays: stars

CDS comments: Table 1 : K star in the field of HD 154791 not in SIMBAD.

Simbad objects: 5

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Number of rows : 5
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 BD+61 195 PM* 01 02 38.8680626986 +62 20 42.175257431   11.439   8.7   M1.5V 285 0
2 BD-07 3632 WD* 13 30 13.6370112733 -08 34 29.468140653 11.803 12.398 12.340 12.39 12.436 DA3.5 203 0
3 BD+33 2642 pA* 15 51 59.8854348048 +32 56 54.329485272 9.806 10.61 10.73 10.884 10.961 O7p 456 0
4 V* V934 Her LXB 17 06 34.5128222328 +23 58 18.639373836 11.20 9.16 7.62     M3III(e) 165 0
5 V* V2116 Oph Sy* 17 32 02.1532435416 -24 44 44.129169096   20.78 18.4     M6IIIe 719 1

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