Binaries and distances
نویسندگان
چکیده
منابع مشابه
Direct Distances to Nearby Galaxies Using Detached Eclipsing Binaries
The DIRECT project aims to determine direct distances to two important galaxies in the cosmological distance ladder – M31 and M33 – using detached eclipsing binaries (DEBs) and Cepheids. We present the results of the first large-scale CCD-based search for variables in M33. We have observed two fields located in the central region of M33 for a total of 95 nights on the F. L. Whipple Observatory ...
متن کاملThe distances to the X - ray binaries LSI + 61 ◦ 303 and A 0535 + 262
Chevalier & Ilovaisky (1998) use Hipparcos data to show that the X-ray binary systems LSI+61◦ 303 and A0535+262 are a factor of ten closer (i.e. d ∼ few hundred pc) than previously thought (d ∼ 2kpc). We present high quality CCD spectra of the systems, and conclude that the spectral types, reddening and absolute magnitudes of these objects are strongly inconsistent with the closer distances. We...
متن کاملThe distances to Galactic low–mass X–ray binaries: consequences for black hole luminosities and kicks
We investigated the reported distances of Galactic black hole (BH) and neutron star low–mass X–ray binaries (LMXBs). Comparing the distances derived for the neutron stars Cyg X–2 and XTE J2123–058 using the observed Eddington limited photospheric radius expansion bursts with the distances derived using the observed radius and effective temperature of the companion star we find that the latter a...
متن کاملO ct 1 99 7 DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and
We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder – M31 and M33, using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, detached eclipsing binaries provide us with the potential to determine these distances with an accuracy better than 5%. The massive photometry obtained in o...
متن کاملConstraining the propagation speed of gravitational waves with compact binaries at cosmological distances
When testing gravity in a model-independent way, one of the crucial tests is measuring the propagation speed of a gravitational wave (GW). In general relativity, a GW propagates with the speed of light, while in the alternative theories of gravity, the propagation speed could deviate from the speed of light due to the modification of gravity or spacetime structure at a quantum level. Previously...
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: Proceedings of the International Astronomical Union
سال: 2012
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921312021138