The ultracool helium-atmosphere white dwarf companion of PSR J0740+6620?
نویسندگان
چکیده
منابع مشابه
Discovery of an Ultracool White Dwarf Companion
The discovery of a low luminosity common proper motion companion to the white dwarf GD392 at a wide separation of 46 is reported. BV RIJHK photometry strongly indicates suppressed flux at all near infrared wavelengths. Thus, GD392B is one of the few white dwarfs to show collision-induced absorption due to the presence of photospheric H2 and the first ultracool white dwarf detected as a companio...
متن کاملThe white dwarf companion to PSR B 0820 + 02 ?
We report new spectroscopic and photometric observations of the white dwarf companion to the pulsar PSR B0820+02. The white dwarf is a normal DA white dwarf with an effective temperature of 15000 K and a mass of 0.6 M . The mass and orbital period of this system confirm recent simulations of the evolution of a neutron star – main sequence binary with mass exchange and thus implicitely theoretic...
متن کاملThe evolutionary status of the white dwarf companion of the binary pulsar PSR J1713+0747
Recently Splaver and coworkers have measured the masses of the white dwarf and the neutron star components of the PSR J1713+0747 binary system pair by means of the general relativistic effect known as Shapiro Delay with very high accuracy. Employing this data we attempt to find the original configuration that evolved to the observed system. For this purpose we perform a set of binary evolution ...
متن کاملTemperature and cooling age of the white dwarf companion of PSR J 0218 + 4232
We report on Keck optical BVRI images and spectroscopy of the companion of the binary millisecond pulsar PSR J0218+4232. A faint bluish (V = 24.2, B − V = 0.25) counterpart is observed at the pulsar location. Spectra of this counterpart reveal Balmer lines which confirm that the companion is a Helium–core white dwarf. We find that the white dwarf has a temperature of Teff = 8060 ± 150 K. Unfort...
متن کاملThe ultra - cool white dwarf companion of PSR J 0751 + 1807
We present optical and near-infrared observations with Keck of the binary millisecond pulsar PSR J0751+1807. We detect a faint, red object – with R = 25.08 ± 0.07, B − R = 2.5 ± 0.3, and R − I = 0.90 ± 0.10 – at the celestial position of the pulsar and argue that it is the white dwarf companion of the pulsar. The colours are the reddest among all known white dwarfs, and indicate a very low temp...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2019
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stz607