2003A&A...399..211I


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET13:36:36

2003A&A...399..211I - Astronomy and Astrophysics, volume 399, 211-218 (2003/2-3)

Understanding the LMXB X2127+119 in M15. II. The UV data.

IOANNOU Z., VAN ZYL L., NAYLOR T., CHARLES P.A., MARGON B., KOCH-MIRAMOND L. and ILOVAISKY S.

Abstract (from CDS):

We present HST UV observations of the high-inclination low mass X-ray binary AC211 (X2127+119), which is located in the globular cluster M15 (NGC 7078). We have discovered a Civ P Cygni profile in this system, which confirms the existence of an outflow from AC211. The outflow velocity as measured from the P Cygni profile is ≃1500km/s. We calculate that the mass lost through this wind is too small to support a large period derivative as favoured by Homer & Charle, (1998NewA....3..435H). Using new X-ray observations we have revised the ephemeris for AC 211 and we find no evidence in support of a period derivative. The UV spectrum exhibits several absorption features due to O, Si and C. The very strong HeII line at 1640Å is not seen to modulate strongly with orbital phase, suggesting its origin lies in the outer parts of the system. In contrast, the eclipse of the UV continuum is short compared with the X-ray and optical eclipses.

Abstract Copyright:

Journal keyword(s): accretion, accretion discs - stars: binaries: eclipsing - stars: coronae - stars: individual: X2127+119, AC 211 - ultraviolet: stars

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1788 2
2 CXOU J212958.1+121002 XB* 21 29 58.06 +12 10 02.6     16.6     ~ 64 1
3 4U 2129+12 LXB 21 29 58.3124 +12 10 02.670 14.50 15.70 15.8     ~ 302 1
4 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2926 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-13:36:36

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