Bibcode
Bandyopadhyay, R. M.; Shahbaz, T.; Charles, P. A.; Naylor, T.
Referencia bibliográfica
American Astronomical Society, HEAD meeting #4, #15.12; Bulletin of the American Astronomical Society, Vol. 31, p.713
Advertised on:
4
1999
Número de citas
0
Número de citas referidas
0
Descripción
Using CGS4 on UKIRT, we have obtained 2.00--2.45 mu m infrared spectra
of a number of low-mass X-ray binaries including Sco X-1, Sco X-2, and
GX13+1. Sco X-1 shows emission lines only, supporting our previous
conclusion that the spectral type of the evolved secondary must be
earlier than G5. Emission lines are also seen in the spectrum of Sco
X-2, confirming the identity of the IR counterpart. We report the
detection of CO bands in GX13+1 and estimate the most likely spectral
type of the secondary to be K5 sc iii. We also find P Cygni type
profiles in the Brackett gamma lines of Sco X-1 and GX13+1, indicating
the presence of high velocity outflows in these systems. We present
spectra of candidate IR counterparts to several other elusive X-ray
binaries. Finally, implications for the nature and classification of
these systems are discussed.