DSS1/DSS2 astrometry for 1101 First Byurakan Survey blue stellar objects: Accurate positions and other results

Mickaelian, A. M.

doi:10.1051/0004-6361:20047121

Cited by 12 publications

(17 citation statements)

References 24 publications

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“…Accurate DSS2 (red) positions were measured during the identification for all these objects, DSS2 (red) being the most accurate (Mickaelian 2004) and closest to the ROSAT observing epoch. Optical positions also allowed the optical-X-ray distances to be determined in units of the 1σ-error radius, which gives a better estimate of the probability of correct identifications than do the absolute numbers.…”

Section: The Hqs Spectra and Dss Imagesmentioning

confidence: 99%

Optical identification of ROSAT-FSC sources

Mickaelian¹,

Hovhannisyan²,

Engels

et al. 2006

A&A

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The Byurakan/Hamburg/ROSAT Catalogue (BHRC) of the optical identifications of X-ray sources is presented. The BHRC includes all 2791 sources from the ROSAT-FSC with |b| ≥ 30• , δ ≥ 0 • and ROSAT count rate CR > 0.04 cts s −1 . For the optical identifications, we used the Hamburg Quasar Survey (HQS) digitized spectroscopic plates, the DSS1 and DSS2 (blue, red, and IR) images, the MAPS photometric data, the USNO-B1.0 (for proper motions), the NVSS and FIRST radio, and the IRAS and 2MASS infrared catalogues. From the DSS images we obtained positional, brightness, color, extension, variability, proper motion information, and measured the optical-to-X-ray distance. Based on the DSS images, a morphological classification was made. Available SIMBAD and NED data were used as well. Cross-correlations were made with AGN, white dwarf, and cataclysmic variable catalogues (322/8/7 associations, respectively). We managed to identify 97% of sources (2696 sources) that are associated with 3202 optical objects. 2248 X-ray sources have a single optical counterpart, 144 have a double or multiple optical counterpart (binaries, galaxy groups etc.), and 304 have ambiguous identifications. We find that some of the latest might actually be blends of two X-ray sources that were not resolved by ROSAT. The QSOs and AGN represent the largest group of X-ray counterparts (56.2%); bright stars (including late type stars, but excluding WDs and CVs) are counterparts for 33.2% of sources, and the bright galaxies and groups of galaxies comprise 9.2%. We found a number of close galaxy pairs (possibly interacting/merging galaxies) that are counterparts for X-ray sources (3.0%), as well as 1.0% WDs and 0.4% CVs. The BHRC may be used for selection and for studies of samples of various classes of X-ray emitters.

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Section: The Hqs Spectra and Dss Imagesmentioning

confidence: 99%

Optical identification of ROSAT-FSC sources

Mickaelian¹,

Hovhannisyan²,

Engels

et al. 2006

A&A

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“…For the new version of the catalogue, we measured the accurate DSS2 red optical positions using our experience with the FBS blue stellar objects (Mickaelian 2004). We obtained 0.5 accuracy in each coordinate, worse than the 0.33 given in the cited paper, as the BIS objects are brighter, and more accurate measurements are not possible.…”

Section: Accurate Optical Positionsmentioning

confidence: 99%

“…However, based on our previous work (Mickaelian 2004), when a number of PM from the USNO were not confirmed, we decided to crosscheck them independently with our measurements from DSS1 and DSS2. We took the result as a real PM, if both data given in the USNO (in PM -RA and PM -Dec) match.…”

Section: Proper Motionsmentioning

confidence: 99%

Revised and updated catalogue of Byurakan-IRAS stars

Mickaelian¹,

Gigoyan²

2006

A&A

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Context. Five lists of late-type stars were published in Astrophysics in [1997][1998][1999][2000][2001], found in the First Byurakan Survey low-dispersion spectroscopic plates as optical identifications of unidentified IRAS sources. These identifications were carried out in the region with δ > +61• and |b| > 15• with a surface of 1504 deg 2 . As a result, the catalogue of the Byurakan-IRAS Stars (BIS) was compiled. Its preliminary version has been available at the CDS since 2003. Aims. We revised and updated the BIS catalogue with the new data from recently published optical and infrared catalogues to give access to all available data and make further comparative studies of the properties of these objects possible. Methods. We made cross-correlations of the BIS catalogue with the MAPS, USNO-B1.0, and 2MASS, added updated SIMBAD data for the BIS objects, and provided accurate DSS1 and DSS2 positions and revised photometry. We also checked the objects for proper motion and variability. A refined classification from low-dispersion spectra in the Digitized First Byurakan Survey (DFBS) was carried out. Results. The revised and updated catalogue of 276 Byurakan-IRAS stars (BIS) is presented. Conclusions. The BIS catalogue can be used to study a complete sample of IRAS-selected stars and to investigate individual objects.

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“…The successive columns list: (1) FBS number, Table 1 is followed by comments on the objects that were studied with a description of the spectra and other data. [12], but measurements of the difference in the coordinates in DSS1 and DSS2 [26] do not confirm this result. The data in USNO-B1.0 may be in error.…”

Section: Processing the Spectramentioning

confidence: 83%

Spectral observations of blue stellar objects from FBS in the zone δ = +43°

Sinamian

Mickaelian

2006

Astrophysics

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Results of spectral observations of blue stellar objects from the FBS are presented for the purpose of classifying them, discovering new interesting objects, and studying the FBS sample as a whole. 99 FBS objects in the band with central declination δ = +43° were observed on the 2.6-m telescope at the Byurakan Observatory in 1987-1991 and have been digitized using a professional scanner and processed by MIDAS in a way similar to CCD spectra. 12 objects were also observed with the BAO-2.6 and OHP-1.93 telescopes using modern techniques during 1997-2000; some were repeated observations for confirming or correcting the classifications. A new planetary nebula, 7 white dwarfs, 78 hot subdwarfs, 9 HBB stars, and 6 stars in classes F-G were discovered. Proper motions in the range 57-84 mas/year were obtained for three stars (DA, DAB, and sdB). Three stars (a white dwarf and two subdwarfs) are identified with x-ray sources. The spectra of the 30 most interesting objects are given.

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DSS1/DSS2 astrometry for 1101 First Byurakan Survey blue stellar objects: Accurate positions and other results

Cited by 12 publications

References 24 publications

Optical identification of ROSAT-FSC sources

Optical identification of ROSAT-FSC sources

Revised and updated catalogue of Byurakan-IRAS stars

Spectral observations of blue stellar objects from FBS in the zone δ = +43°

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