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Hyades kinematics and the relationship between galactic coordinates and its angular distance from the apex with GAIA EDR3
Elsanhoury, W. H.; Al-Johani, A. S.; Al-Juhani, A. +6 more
In this paper, we have improved the Hyades members with aid of the Gaia EDR3 source. We have studied their kinematics, including computations of the convergent point with AD-diagram method such as (A0, D0) = (79.48 ± 0.11°, 6.85 ± 0.38°), their spatial velocities U, V, W (km/s), their morphology with 3D. A relation was established for Hyades stars…
Companions to Kepler giant stars: A long-period eccentric sub-stellar companion to KIC 3526061 and a stellar companion to HD 187878
Cochran, William D.; Vítková, Michaela; Kabáth, Petr +12 more
Context. Our knowledge of populations and the occurrence of planets orbiting evolved intermediate-mass stars is still incomplete. In 2010 we started a planet search programme among 95 giant stars observed by the Kepler mission to increase the sample of giant stars with planets and with reliable estimates of stellar masses and radii.
Aims: We …
Rise and fall of silicate dust in RS Ophiuchi following the 2006 eruption
Gehrz, R. D.; Eyres, S. P. S.; Evans, A. +4 more
We present an analysis of archival Spitzer InfraRed Spectrograph (IRS) observations of the recurrent nova RS Ophiuchi obtained on several occasions, beginning about 7 months after the outburst in 2006. These data show atomic emission lines, absorption bands due to photospheric SiO, and the well-known silicate dust features at 9.7 and $18\, \mu$m. …
An analysis of the twenty-five most distant open clusters
Perren, G. I.; Pera, M. S.; Navone, H. D. +2 more
We present an analysis of the twenty-five open cluster with the largest catalogued distances to the Sun (> 9 kpc). The clusters are selected after cross-matching the four largest published catalogs to date. Distance values in these catalogs show enormous differences between them. The data used to perform the analysis (astrometry and photometry)…
Gaia Early Data Release 3. Summary of the contents and survey properties
Prusti, T.; Mazeh, T.; Zucker, S. +423 more
Context. We present the early installment of the third Gaia data release, Gaia EDR3, consisting of astrometry and photometry for 1.8 billion sources brighter than magnitude 21, complemented with the list of radial velocities from Gaia DR2.
Aims: A summary of the contents of Gaia EDR3 is presented, accompanied by a discussion on the difference…
In the realm of the Hubble tension-a review of solutions
Riess, Adam G.; Di Valentino, Eleonora; Melchiorri, Alessandro +6 more
The simplest ΛCDM model provides a good fit to a large span of cosmological data but harbors large areas of phenomenology and ignorance. With the improvement of the number and the accuracy of observations, discrepancies among key cosmological parameters of the model have emerged. The most statistically significant tension is the 4σ to 6σ disagreem…
Estimating Distances from Parallaxes. V. Geometric and Photogeometric Distances to 1.47 Billion Stars in Gaia Early Data Release 3
Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M. +2 more
Stellar distances constitute a foundational pillar of astrophysics. The publication of 1.47 billion stellar parallaxes from Gaia is a major contribution to this. Despite Gaia's precision, the majority of these stars are so distant or faint that their fractional parallax uncertainties are large, thereby precluding a simple inversion of parallax to …
The Radius of PSR J0740+6620 from NICER and XMM-Newton Data
Guillemot, L.; Kerr, M.; Ray, P. S. +25 more
PSR J0740+6620 has a gravitational mass of 2.08 ± 0.07 M⊙, which is the highest reliably determined mass of any neutron star. As a result, a measurement of its radius will provide unique insight into the properties of neutron star core matter at high densities. Here we report a radius measurement based on fits of rotating hot spot patte…
Gaia Early Data Release 3. The astrometric solution
Mora, A.; Esquej, P.; Jordan, S. +94 more
Context. Gaia Early Data Release 3 (Gaia EDR3) contains results for 1.812 billion sources in the magnitude range G = 3-21 based on observations collected by the European Space Agency Gaia satellite during the first 34 months of its operational phase.
Aims: We describe the input data, the models, and the processing used for the astrometric con…
A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
Remillard, Ronald A.; Okajima, Takashi; Bogdanov, Slavko +27 more
We report on Bayesian estimation of the radius, mass, and hot surface regions of the massive millisecond pulsar PSR J0740+6620, conditional on pulse-profile modeling of Neutron Star Interior Composition Explorer X-ray Timing Instrument event data. We condition on informative pulsar mass, distance, and orbital inclination priors derived from the jo…