Companions of the millisecond pulsars J0621+2514 and J0740+6620

A. V. Karpova1, D. A. Zyuzin1, D. M. Beronya1, Yu. A. Shibanov1, A. Yu. Krirchenko2,1, S. V. Zharikov2, A. Cabrera Lavers3,4

1Ioffe Institute, Politekhnicheskaya 26, Saint Petersburg 194021, Russia
2Instituto de Astronomía, Universidad Nacional Autónoma de México, México
3 Instituto de Astrofísica de Canarias, Spain
4 Departamento de Astrofísica, Universidad de La Laguna, Spain

We present analysis of optical data on two binary millisecond pulsars J0621+2514 É J0740+6620. The presumed companion of J0621+2514 was found in the SDSS and Pan-STARRS catalogues, while that of J0740+6620 was detected with the Gran Telescopio Canarias. Comparison with white dwarfs cooling models show that the former is likely a He-core white dwarf with a temperature of about 10000 K, and the latter can be an ultracool He-atmosphere white dwarf with a temperature of < 3500 K.

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