منابع مشابه
UBVRI photometric sequences for symbiotic stars
Deep, wide-range and accurate UBVRI photometric sequences have been established around more than 80 symbiotic stars, to assist current photometry as well as measurement of old photographic plates. Sequences for 40 symbiotic stars have already been published; the observations for the others have already been secured.
متن کاملPhotometric identification of blue horizontal branch stars
We investigate the performance of some common machine learning techniques in identifying Blue Horizontal Branch (BHB) stars from photometric data. To train the machine learning algorithms, we use previously published spectroscopic identifications of BHB stars from Sloan Digital Sky Survey (SDSS) data. We investigate the performance of three different techniques, namely k nearest neighbour class...
متن کاملThe uBVI Photometric System . II . Standard Stars
Paper I of this series described the design of a CCD-based photometric system that is optimized for ground-based measurements of the size of the Balmer discon-tinuity in stellar spectra. This " uBVI " system combines the Thuan-Gunn u filter with the standard Johnson-Kron-Cousins BVI filters, and it can be used to discover luminous yellow supergiants in extragalactic systems and post-asymptotic-...
متن کاملPhotometric Catalog of Sym - Biotic Stars
We present a multi-epoch, accurate UBVRcIc photometric catalog of 83 symbiotic stars and related objects, measured while calibrating the Henden and Munari (2000, 2001, 2006) photometric sequences around them. The vast majority of the observations where collected in the time interval between October 19, 1998 to April 21, 2002 with the 1.0-m Ritchey-Chrétien telescope of the U. S. Naval Observato...
متن کاملSpectroscopic and photometric investigations of MAIA candidate stars
Including our own observational material and the Hipparcos photometry data, we investigate the radial velocity and brightness of suspected Maia variable stars which are classified also in some examples as peculiar stars, mainly for the existence of periodic variations with time-scales of hours. The results lead to the following conclusions: (1) Short-term radial velocity variations have been un...
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ژورنال
عنوان ژورنال: Transactions of the International Astronomical Union
سال: 1973
ISSN: 0251-107X
DOI: 10.1017/s0251107x00025086