SIMBAD references

2019MNRAS.485.3715B - Mon. Not. R. Astron. Soc., 485, 3715-3720 (2019/May-3)

The ultracool helium-atmosphere white dwarf companion of PSR J0740+6620?

BERONYA D.M., KARPOVA A.V., KIRICHENKO A.Y., ZHARIKOV S.V., ZYUZIN D.A., SHIBANOV Y.A. and CABRERA-LAVERS A.

Abstract (from CDS):

We report detection of the likely companion of the binary millisecond pulsar (MSP) J0740+6620 with the Gran Telescopio Canarias in the r' and i' bands. The position of the detected starlike source coincides with the pulsar coordinates within the 1σ uncertainty of ≃0.2 arcsec. Its magnitudes are r' = 26.51 ± 0.17 and i' = 25.49 ± 0.15. Comparing the data with the white dwarf (WD) cooling tracks suggests that it can be an ultracool helium-atmosphere WD with the temperature <=3500 K and cooling age >=5 Gyr. The age is consistent with the pulsar characteristic age corrected for kinematic effects. This is the reddest source among known WD companions of MSPs. Detection of the source in other bands would be useful to clarify its properties and nature.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: neutron - pulsars: general - binaries: general - pulsars: individual: PSR J0740+6620

Simbad objects: 16

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2021.04.16-22:57:26

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