Late-type stars found in the DFBS

Gigoyan, K. S.; Sinamyan, P. K.; Engels, D.; Mickaelian, A. M.

doi:10.1007/s10511-010-9105-1

Cited by 16 publications

(10 citation statements)

References 45 publications

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“…The DFBS spectral plates are analysed with the help of A&A 544, A95 (2012) standard image analysis softwares (FITSView and SAOImage ds9). This visualisation allows us to detect very red and faint candidate stars close to the detection limit in each DFBS plate (particularly, the range ∼6500-6900 Å for the very late subclasses of the N-type and M-type stars, Gigoyan et al 2010Gigoyan et al , 2009) and to perform a better selection of red objects using the possibilities of the analysis softwares compared to the eye-piece search used before (Gigoyan et al 2001). The second and also very significant advantage is using the image analysis softwares for comparatively bright (m V ∼ 12-13 mag) early-type carbon stars, for which in the blue part of the low-resolution spectra the C 2 absorption bands are not easy to detect due to saturation.…”

Section: The Digitized First Byurakan Survey Datamentioning

confidence: 86%

New carbon stars found in the Digitized First Byurakan Survey

Gigoyan¹,

Russeil²,

Mickaelian³

et al. 2012

A&A

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Faint high-latitude carbon stars (FHLCs) are distant, luminous giants. For this reason, they are often used to study the dynamical and chemical properties of the Galactic Halo. However, a more accurate investigation of photometric and spectroscopic surveys has revealed an increasing number of such objects with luminosities of main sequence stars. We report the first results of a systematic search of FHLCs using the Digitized First Byurakan Survey (DFBS) low-resolution spectral database. The DFBS low-resolution spectral plates are analysed to find new faint early and late-type carbon star candidates. Twenty new faint high-latitude carbon star candidates have been detected in an area of ∼4030 sq. deg. Moderate-resolution slit spectroscopy was carried out for all candidates, confirming the carbon star nature for thirteen of them (nine are new discoveries), while the remaining objects are M-type stars. The carbon star sample consists of five N-type carbon stars, for which the estimated mass-loss rates agree well with the typical ones found for such carbon stars; five comparatively bright CH-type carbon stars; and three are probably dwarf carbon (dC) stars. The distance determination indicates that the dC stars belong to the thin disk, while the other stars belong the Galactic halo. These results demonstrate that one can efficiently find new faint high-latitude carbon stars in the DFBS database.

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Section: The Digitized First Byurakan Survey Datamentioning

confidence: 86%

New carbon stars found in the Digitized First Byurakan Survey

Gigoyan¹,

Russeil²,

Mickaelian³

et al. 2012

A&A

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“…There are a number of further possible research projects that will be conducted having the plates digitized, such as Correction of ephemerides of known asteroids and search for new asteroids (Berthier et al 2009), Discovery and study of variable stars, Revealing high proper motion stars, Study of variability of known blazars and discovery of new blazars, Revealing Novae and Supernovae progenitors, Discovery of new QSOs, new white dwarfs, new late-type stars (Gigoyan et al 2010) and optical sources of gamma-ray bursts, Optical identifications of X-ray, IR and radio sources (Mickaelian & Sargsyan 2004;Mickaelian & Gigoyan 2006;Hovhannisyan et al 2009).…”

Section: Discussionmentioning

confidence: 99%

BAO Plate Archive digitization, creation of electronic database and its scientific usage

et al. 2015

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Astronomical plate archives created on the basis of numerous observations at many observatories are important part of the astronomical heritage. Byurakan Astrophysical Observatory (BAO) plate archive consists of 37,000 photographic plates and films, obtained at 2.6m telescope, 1m and 0.5m Schmidt telescopes and other smaller ones during 1947--1991. In 2002-2005, the famous Markarian Survey (First Byurakan Survey, FBS) 2000 plates were digitized and the Digitized FBS (DFBS) was created. New science projects have been conducted based on these low-dispersion spectroscopic material. In 2015, we have started a project on the whole BAO Plate Archive digitization, creation of electronic database and its scientific usage. The project will run during 3 years in 2015--2017 and the final result will be an electronic database and online interactive sky map to be used for further research projects.

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“…Among the newly detected FBS C stars, we found two new carbon dwarfs (dC), namely FBS 0845+466 and FBS 1339+117 (Gigoyan et al 2008, 2010), located approximately at distances of 72 and 60 pc, respectively, and M V ≈+10.0. The object FBS 2213+421 with a very large colour index ( J − H = 3.011 and H − K s = 2.408) belongs to the group of extreme carbon stars (ECSs).…”

Section: Study Of the Fbs Sample Of Late‐type Starsmentioning

confidence: 95%

“…Since 1987, the FBS C stars have been studied spectroscopically with the BAO 2.6‐m telescope (UAGS, ByuFOSC2 and SCORPIO spectrographs; Abrahamian & Gigoyan 1993b; Abrahamian, Hambaryan & Gigoyan 1994; Gigoyan, Mickaelian & Mauron 2006; Gigoyan et al 2010). Medium‐ and high‐resolution CCD spectra for the FBS C stars were also obtained with the Observatoire de Haute‐Provence (OHP) 1.93‐m telescope (CARELEC spectrograph; Gigoyan, Azzopardi & Muratorio 2000; Gigoyan et al 2001a; Mauron, Gigoyan & Kendall 2007b; Mauron 2008).…”

Section: New Data For the Fbs Late‐type Starsmentioning

confidence: 99%

Revised and updated catalogue of the First Byurakan Survey of late-type stars

Gigoyan

Mickaelian

2011

Monthly Notices of the Royal Astronomical Society

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There have been 15 lists of late‐type stars published between 1990 and 2010. These late‐type stars have been found in the low‐dispersion spectroscopic plates of the First Byurakan Survey (FBS). The systematic search and selection was carried out on a surface ∼16 000 deg2 on almost the whole area of the FBS. As a result, a comprehensive catalogue of the late‐type stars of the FBS was generated. Its preliminary version has been available at the Centre de Donnes Astronomiques de Strasbourg since 2007. We have revised and updated the FBS catalogue of late‐type stars with new data from recently published optical and multiwavelength catalogues to give access to all available data and to make further comparative studies of the properties of these objects possible. We have made cross‐correlations with the Digitized First Byurakan Survey (DFBS), the United States Naval Observatory‐B1.0 catalogue, the Guide Star Catalogue 2.3.2, Tycho‐2, Sloan Digital Sky Survey Data Release 8, the Two‐Micron All‐Sky Survey (2MASS), the Wide‐field Infrared Survey Explorer catalogue, the Infrared Astronomical Satellite Point Source Catalogue/Faint Source Catalogue, the AKARI catalogue, the ROSAT Bright Source Catalogue/Faint Source Catalogue, the General Catalogue of Variable Stars and the Northern Sky Variability Survey. Also, we have added updated SIMBAD data for the objects. We present accurate Digitized Sky Survey 2 positions, approximate spectral subtypes refined from the DFBS low‐dispersion spectra, luminosity classes estimated from 2MASS colours and available proper motions for 1045 FBS late‐type stars. The FBS revised and updated catalogue lists a large number of completely new objects, which promise to extend very significantly the census of M giants, faint carbon stars at high Galactic latitudes and M dwarfs in the vicinity of the Sun. We study the complete samples, as well as investigating individual interesting objects up to 16.0–16.5 mag in visual magnitudes.

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Late-type stars found in the DFBS

Cited by 16 publications

References 45 publications

New carbon stars found in the Digitized First Byurakan Survey

New carbon stars found in the Digitized First Byurakan Survey

BAO Plate Archive digitization, creation of electronic database and its scientific usage

Revised and updated catalogue of the First Byurakan Survey of late-type stars

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