The Hamburg Quasar Monitoring Program ( HQM ) at
نویسنده
چکیده
منابع مشابه
The Hamburg Quasar Monitoring Program (HQM) at Calar Alto⋆: III. Lightcurves of optically violent variable sources
Abstract. HQM is an optical broad-band photometric monitoring program carried out since September 1988. We use a CCD camera at the MPIA 1.2m telescope. Fully automatic photometric reduction relative to stars in the frames is done within a few minutes after each exposure, thus interesting brightness changes can be followed in detail. The typical photometric error is 1–2% for a 17.5mag quasar. We...
متن کاملThe Hamburg/RASS Catalogue of optical identifications Northern high-galactic latitude ROSAT Bright Source Catalogue X-ray sources
We present the Hamburg/RASS Catalogue (HRC) of optical identifications of X-ray sources at highgalactic latitude. The HRC includes all X-ray sources from the ROSAT Bright Source Catalogue (RASS-BSC) with galactic latitude |b| ≥ 30◦ and declination δ ≥ 0◦. In this part of the sky covering∼10 000 deg the RASS-BSC contains 5341 X-ray sources. For the optical identification we used blue Schmidt pri...
متن کاملHS 1603 + 3820 : a bright z em = 2 . 51 quasar with a very rich heavy element absorption spectrum
During the course of Hamburg/CfA Bright Quasar Survey we discovered a bright (B = 15.9), high redshift (z em = 2.51) quasar HS 1603+3820. The quasar has a rich complex of Civ absorbers, containing at least five systems, all within 3000 km s −1 from one another. Despite large ejection velocity (v ej > 5000 km s −1 for all components) the complex is likely to be associated with the quasar. There ...
متن کاملSpectral analysis of sdB stars from the Hamburg Quasar Survey⋆
Abstract. We present the results of a spectral analysis of a large sample of subdwarf B stars selected from followup observations of candidates from the Hamburg Quasar Survey. Fundamental parameters (effective temperature, gravity, and helium abundance) were determined by matching synthetic line profiles calculated from model atmospheres to all hydrogen and helium absorption lines present in th...
متن کاملAn analysis of DA white dwarfs from the Hamburg Quasar Survey
Follow-up spectroscopy of several hundred hot stars detected by the Hamburg Quasar Survey (HQS) has been carried out between 1989 and 1996. We present the analysis of 80 DA white dwarfs using model atmospheres and theoretical cooling tracks to derive the atmospheric parameters Teff and log g, masses and absolute magnitudes. The HQS turned out to be sensitive to the detection of hydrogen-rich wh...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1994