SIMBAD references

2016MNRAS.459..771H - Mon. Not. R. Astron. Soc., 459, 771-778 (2016/June-2)

Keck/MOSFIRE spectroscopy of five ULX counterparts.

HEIDA M., JONKER P.G., TORRES M.A.P., ROBERTS T.P., WALTON D.J., MOON D.-S., STERN D. and HARRISON F.A.

Abstract (from CDS):

We present H-band spectra of the candidate counterparts of five ultraluminous X-ray sources (ULXs; two in NGC 925, two in NGC 4136 and Holmberg II X-1) obtained with Keck/MOSFIRE (Multi-Object Spectrometer for Infra-Red Exploration). The candidate counterparts of two ULXs (J022721+333500 in NGC 925 and J120922+295559 in NGC 4136) have spectra consistent with (M-type) red supergiants (RSGs). We obtained two epochs of spectroscopy of the candidate counterpart to J022721+333500, separated by 10 months, but discovered no radial velocity variations with a 2σ upper limit of 40 km/s. If the RSG is the donor star of the ULX, the most likely options are that either the system is seen at low inclination (

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): infrared: stars - X-rays: individual: Holmberg II X-1 - X-rays: individual: [SST2011] J022721.52+333500.7 - X-rays: individual: [SST2011] J022727.53+333443.0 - X-rays: individual: CXOU J120922.6+295551 - X-rays: individual: [SST2011] J120922.18+295559.7

Simbad objects: 12

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2020.01.18-15:54:00

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