![]() One of them we classify as a CH type giant and other two are N type asymptotic giant branch (AGB) C stars. In this paper we present confirmations for three FBS C star candidates. These candidates are mainly faint objects close to the limit in each DFBS plate, or dot-like spectra showing only the reddest end of the continuum, where or TiO absorption bands are not visible. SAOImage DS9 is an astronomical imaging and data visualization application. However, because our selection of LTSs on DFBS plates is not automatic (using machine learning algorithms), a list of the LTS candidates was noted also for further confirmation. ![]() Several objects can be distinguished by the titanium oxide (TiO) molecular absorption bands at 4584, 4762, 4954, 5167, 6200, and 6700. C stars can be identified through the presence of the C2 molecular bands at 4737, 5165, and 5636 (N type C stars, Swan bands). "The Second Revised And Updated Catalogue of the First Byurakan Survey Late-Type Stars," with comprehensive data for 1471 new objects, will become available very soon at CDS, VizieR, SIMBAD database. The advantage of using this software for selecting type M and C stars is described in paper. Subsequently, all DFBS spectral plates were searched for LTSs using standard image analysis software (FITSView and SAOImage ds9). Now the entire plate set has been digitized, leading to the Digitized First Byurakan Survey (DFBS) (online at ). ![]() The FBS was conducted originally to locate galaxies with ultraviolet excess. It was performed with the Byurakan Astrophysical Observatory (BAO) 1 m Schmidt telescope, which was equipped with 1.5 prism giving dispersion of 1800 /mm near H. The FBS is an objective prism, low-resolution spectral survey that covers a 17.000 area. The spectroscopic plates of the First Byurakan Survey (FBS, also known as the Markarian Survey) were used to select late type stars (LTSs), type M and carbon (C) stars, at high galactic latitudes. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |