UBVR photometry of pre-catacylismic binaries: HW Virginis
نویسندگان
چکیده
منابع مشابه
Pre - main sequence binaries with aligned disks ?
We present the results of a study performed with the goal to investigate whether low-mass pre-main sequence binary stars are formed by multiple fragmentation or via stellar capture. If binaries form preferentially by fragmentation, we expect their disks to be co-planar. On the other hand, the capture scenario will lead to a random distribution of disk orientations. We performed near-infrared po...
متن کاملSpectrophotometric behavior of CU Virginis
The spectrophotometric variability of the magnetic CP star CU Vir in the spectral region from 1150 Å to 7850 Å is investigated. This study is based on the archival IUE and published visual spectrophotometric data obtained at different phases of the rotational cycle. The light variations in the wavelength region longer than λ 2000 Å are generally in antiphase to the variations in the shorter wav...
متن کاملIdentification of the optical counterparts of high-mass X-ray binaries through optical photometry and spectroscopy
We present the results of our search for optical counterparts to high-mass X-ray transient sources discovered by various X-ray missions. We obtained CCD images of the X-ray fields through BVR and Hα filters in order to identify early-type stars in the R − Hα versus B − V colour-colour diagram. We also obtained medium-resolution spectroscopy of the candidates in order to confirm the presence of ...
متن کاملULTRACAM Photometry of the ultracompact binaries V 407 Vul and HM Cnc
V407 Vul (RXJ1914.4+2456) and HM Cnc (RXJ0806.3+1527) are X-ray emitting stars with X-ray light curves that are 100% modulated on periods of 569 and 321 seconds respectively. These periods are thought possibly to represent the orbital periods of close pairs of white dwarfs. In this paper we present optical light curves taken with the highspeed CCD camera ULTRACAM on the 4.2m WHT in May 2003 and...
متن کاملDetection of Pre-main-sequence Binaries Using Spectro-astrometry
The technique of spectro-astrometry (measuring wavelength dependence of the position of an object) has been used to observe a number of pre-main-sequence stars. Several previously known binaries with separations down to 100 milli-arcseconds (mas) were easily detected in these observations by the presence of a broad feature in the position spectrum on the H line. The observations show that T CrA...
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: Astronomy and Astrophysics Supplement Series
سال: 1999
ISSN: 0365-0138,1286-4846
DOI: 10.1051/aas:1999196