First Byurakan Spectral Sky Survey. Blue stellar objects. VII. Zone +61° ≤δ ≤, +65°     

H. V. Abrahamian  A. M. Mickaelian 《Astrophysics》1994,37(1):27-35

The seventh list of blue stellar objects in the second part of the First Byurakan Spectral Sky Survey (FBS) is presented. The objects are located in the zone + 61° + 65° and 5 ^h 30^m 18 ^h 40 ^m .The list contains data on 119 blue stellar objects detected, of which 73 are previously unknown. A preliminary classification of the objects is given. The limiting magnitude of the FBS plates are determined using the photometric calibration of the charts of the Palomar Sky Survey.Translated fromAstrofizika, Vol. 37, No. 1, pp. 43–55, January–March, 1994.  相似文献   

First Byurakan Spectral Sky Survey. Stars of Late-Spectral Types. XIII. Zone +1° ≤ δ ≤ +13°     

K. S. Gigoyan  H. V. Abrahamyan  M. Azzopardi  D. Russeil 《Astrophysics》2002,45(3):322-333

The thirteenth list of faint late M and carbon type stars detected on the plates of the First Byurakan Spectral Sky Survey in zone +1° +13° covering about 3118 sq. degrees is presented. From 285 stars, 161 are newly detected objects: they are 17 carbon stars, 25 carbon star candidates, and 117 M-type stars. The spectral type of two objects is assumed to be between M8 - M9 or late N-subtypes. Among 161 objects, 85 (66 PSC + 19 FSC) are unclassified IRAS sources. Accurate positions, spectral classes, red magnitudes, and color indices are given using several astronomical databases. Finding charts from DSS are given for the most interesting objects.  相似文献   

First Byurakan Spectral Sky Survey. Stars of Late-Spectral Types. XIV. Zone +13° ≤ δ ≤ +33°     

K. S. Gigoyan  H. V. Abrahamyan  M. Azzopardi  N. Mauron  D. Russeil  P. Sinamyan 《Astrophysics》2003,46(4):475-488

We present the fourteenth list of faint late M and carbon type stars detected on the plates of the First Byurakan Spectral Sky Survey in the zone +13° +33° covering about 4736 sq. degrees. From 260 stars, 118 are newly detected objects: they are 19 carbon stars, 5 carbon star candidates, and 94 M-type stars. Among 118 detected objects 73( 57 PSC + 16 FSC ) are unclassified IRAS sources. Accurate positions, spectral classes, red magnitudes, color indices, and near-infrared J, H and K photometry are given, using several astronomical databases. Finding charts from DSS are given for the most interesting objects.  相似文献   

The first byurakan spectral sky survey. Late spectral class stars. VII. The zone +76° ≤ δ ≤ +80°     

G. V. Abramyan  K. S. Gigoyan  G. M. Shakhbazyan 《Astrophysics》1995,38(3):195-199

We present the seventh list of stars of the late M and C spectral classes taken from the plates of the First Byurakan Spectral Sky Survey (FBS). Data on 24 objects, 2 of which are carbon stars of early subclasses (R-stars), are given for the first time. The spectral membership of two known stars is established. The objects lie in the zone 3 ^h 40 ^m 18 ^h 30 ^m and +76° +80°.Translated fromAstrofizika, Vol. 38, No. 3, 1995.  相似文献   

First Byurakan Spectral Sky Survey. Late-type stars. VIII. Zone + 80 ≤ δ ≤ + 90°     

K. S. Gigoyan  V. V. Hambaryan 《Astrophysics》1996,39(4):310-314

The eighth list of late-type stars of spectral classes M and C detected on the plates of the First Byurakan Spectral Sky Survey (FBS) in the zone +80 +90° is presented. Of the 79 objects detected, 67 are new discoveries (66 M stars and one carbon star); 16 objects are unidentified IRAS sources. The equatorial coordinates, spectral classes, and magnitudes are given.Translated fromAstrofizika, Vol. 39, No. 4, pp. 523–529, November, 1996.  相似文献   

First Byurakan Spectral Sky Survey. Blue Stellar Objects. XII. The Region -3° ≤ δ ≤ +1°     

G. V. Abrahamyan  P. K. Sinamyan  K. S. Gigoyan 《Astrophysics》2003,46(1):46-57

The twelfth list of blue stellar objects in the second part of the First Byurakan Spectral Sky Survey (FBS) is presented. This list contains 143 objects in the region -3° +1° at high latitudes with an area of approximately 992 square degrees (62 fields). The objects have magnitudes V of 11.8-18.1 and B-V colors ranging from -0.82 to +0.81. Of the 143 objects, 51 have been discovered for the first time. Equatorial coordinates, V magnitudes, color indices, and preliminary classifications of the objects are given. DSS identification charts are given for the newly discovered objects.  相似文献   

First Byurakan Spectral Sky Survey. Blue stellar objects. XI. Region +80 ≤ δ ≤ +90°     

H. V. Abrahamian  A. M. Mickaelian 《Astrophysics》1996,39(4):315-320

The eleventh list of blue stellar objects in the second part of the First Byurakan Spectral Sky Survey (FBS) is presented. The list consists of 64 objects located in the region +80 +90° and 2^h 08^m a 20^h 15^m. The objects haveV magnitudes in the range 12.3–17.4 andB–V color indices in the range -0.55-+0.55. Of the 98 objects, 56 are newly discovered. Tentative classifications are given for 28 objects, of which there is one planetary nebula, 6 possible quasars, 15 possible white dwarfs, and 6 possible cataclysmic variables. Two of the latter are possibly novae having erupted at the epoch of exposure of the FBS plates in this region.Translated fromAstrofizika, Vol. 39, No. 4, pp. 531–540, November, 1996.  相似文献   

First Byurakan Spectral Sky Survey. Stars of Late Spectral Types. XII. Zone -3° ≤ δ ≤ +1°     

K. S. Gigoyan  H. V. Abrahamyan  M. Azzopardi  D. Russeil 《Astrophysics》2001,44(3):328-334

The twelfth list of faint late M and carbon type stars detected on the plates of the First Byurakan Spectral Survey in zone -3° +1° covering about 1070 sq. degrees is presented. From 86 detected stars, 57 are newly discovered objects: they are 3 R-type carbon stars, 2 carbon star candidates and 52 M-type stars. Among the latter 34 (28 PSC + 6 FSC) are unclassified IRAS sources. Equatorial coordinates, spectral classes, color indices, and red magnitudes determined from the Palomar E-charts are presented.  相似文献   

The First Byurakan Spectral Sky Survey. Late-type stars. VI. The zone+69°≤δ≤+77°     

G. V. Abramyan  K. S. Gigoyan 《Astrophysics》1995,38(2):115-118

We present the sixth list of red stars selected from the plates of the First Byurakan Spectral Sky Survey. These objects are located in the zone3 ^h 45 ^m 18 ^h and+69°+77°. The list contains data on 42 new objects. We suggest that there exists a dust cloud around 2 of them.Translated fromAstrofizika, Vol. 38, No. 2, 1995.  相似文献   

The Mars opposition effect at 20°N. latitude and 20°W. longitude     

Thomas E. Thorpe 《Icarus》1979,37(2):389-398

Low phase angle observations in the Chryse-Acidalia region have been obtained the Viking Orbiter 1 spacecraft under clearer atmospheric conditions than reported earlier. A variety of surface features were recorded, e.g., crater streaks, dark and bright patches. Several findings for this scene include: an abrupt brightness increase (10%) was found at phase angles less than 3°, an effect dependent on surface albedo and possibly particle distribution; a slight weakening of reflectance surge with decreasing wavelengths; a larger opposition effect for features of high albedo was recorded; and a greater reddening with increase phase angle took place for low albedo regions. Both reflectance and contrast values are provided at three wavelengths as a function of phase angle from 0.15 to 20°.  相似文献   

The first byurakan Spectral Sky Survey. Blue stellar objects. X. The zone+73°≤σ≤+80°     

G. V. Abramyan  A. M. Mikaelyan 《Astrophysics》1995,38(2):108-114

We present the tenth list of blue stellar objects of the second part of the First Byurakan Spectral Sky Survey (FBS). The list contains 100 objects in the region+73°+80° and3 ^h 30 ^m 18 ^h 30 ^m encompassing an area of 355 square degrees. The objects have stellar V magnitude within the limits 12.0–18.5 and B-V colors between–0.77 and+0.37. Of these 100 objects, 80 were discovered for the first time. We give the equatorial coordinates, stellar V magnitude, color index CI, and preliminary classification of the objects on the basis of low-disperion prismatic spectra. For 29 objects we give approximate types, among which 4 are candidates for quasars, 2 for Seyfert galaxies, 1 for superassociation galaxy IC 381, 18 for white dwarfs, and 4 for cataclysmic variables.Translated fromAstrofizika, Vol. 38, No. 2, 1995.  相似文献   

Investigation of Galaxies of the Second Byurakan Sky Survey. IV. Spectroscopic Observations in the Fields of 11h30m, +59° and 12h00m, +59°     

S. A. Hakopian  S. K. Balayan 《Astrophysics》2001,44(4):476-490

Spectroscopic observations of 71 objects have completed the follow-up spectroscopy of galaxies in two adjacent fields of the Second Byurakan Survey with central coordinates = 11^h30^m, = +59° and = 12^h00^m, = +59°. The spectra were obtained on the 2.6-m telescope of the Byurakan Astrophysical Observatory and the 6-m telescope of the Special Astrophysical Observatory. The redshifts and absolute stellar magnitudes of all the galaxies have been determined. The objects have been classified using an adapted scheme.  相似文献   

Investigation of Galaxies of the Second Byurakan Sky Survey. III. Spectroscopic Observations in the Fields of 09h47m, +51° and 09h50m, +55°     

S. K. Balayan  S. A. Hakopian  V. L. Afanasiev  S. N. Dodonov 《Astrophysics》2001,44(2):163-170

The results of observations of 49 objects from the second Byurakan spectroscopic sky survey are given; they complete the recent spectroscopy of galactic samples in the fields centered on the coordinates = 09^h47^m, = +51° and = 09^h50^m, = +55°. The spectra were obtained on the 2.6-m telescope of the Byurakan Astrophysical Observatory, National Academy of Sciences of the Republic of Armenia, and the 6-m telescope of the Special Astrophysical Observatory, Russian Academy of Sciences, during 1998-2000. Redshifts and absolute stellar magnitudes were determined for all the galaxies.  相似文献   

The first Byurakan Spectral Sky Survey. Stars of later spectral classes. V. The zone +65°⩽δ⩽+69°     

G. V. Abramyan  K. S. Gigoyan 《Astrophysics》1994,37(4):322-325

We give the fifth list of red stars of the First Byurakan Spectral Sky Survey. The objects are located in the zone 5^h 18^h 30^m and +65 +69. The list contains the data on 18 new objects, one of which is a star of class R. We also give the first determination of the spectral class of 11 variable objects, for four of which we give the spectrograms in the range of wavelengths 4700–6700å.Translated fromAstrofizika, Vol. 37, No. 4, 1994.  相似文献   

Byurakan spectral sky surveys. Blue stellar objects in the strip at δ = +47°     

L. K. Erastova 《Astrophysics》2009,52(3):369-376

This is a list of 111 blue stellar objects and individual active galaxies with excess ultraviolet continuum lying within 08^b-17^h in α and +45°- +49° in δ (1950.0). The surveyed objects are classified in terms of activity type.  相似文献   

First Byurakan Spectral Sky Survey. Stars of Late Spectral Types. XI. Zone -7° ≤ δ ≤ -3°     

K. S. Gigoyan  H. V. Abrahamyan  M. Azzopardi  D. Russeil 《Astrophysics》2001,44(1):88-97

The eleventh list of faint late M and carbon type stars detected on the plates of the First Byurakan Spectral Survey in zone -7° -3° and covering about 1000 square degrees is presented. From 126 detected stars, 88 are newly discovered objects: they are 6 carbon stars, 8 carbon star candidates, and 74 M-type stars; among the latter 38 (26 PSC + 12 FSC) are unclassified IRAS sources, and one object is an unclassified ROSAT source. Distances to the 6 newly discovered early-type carbon stars are estimated. Equatorial coordinates, red magnitudes, and spectral classes determined from the Palomar E-charts are provided. The lack of optical counterparts on Palomar O and E maps for two detected late M-type stars indicates a large variability in brightnesses of these objects (amplitude not smaller than 7.0 magnitude).  相似文献   

The light variability of BD+25°2511     

A. V. Raveendran 《Astrophysics and Space Science》1984,99(1-2):171-173

Photometry of the spectroscopic binary BD+25°2511 obtained during the 1981, 1982, and 1983 observing seasons shows that it is a variable with a period of about 3.5 days.Paper presented at the Lembang-Bamberg IAU Colloquium No. 80 on Double Stars: Physical Properties and Generic Relations, held at Bandung, Indonesia, 3–7 June, 1983.  相似文献   

First Byurakan Spectral Sky Survey. Stars of late spectral types. −11° ≤ δ ≤ −7° belt     

K. S. Gigoyan  V. V. Hambaryan  M. Azzopardi 《Astrophysics》1998,41(4):356-366

A 10th list of late-type M and C stars found on plates of the First Byurakan Spectral Sky Survey in the − 11° ≤ δ ≤ − 7° belt with an area of about 1070 deg² is given. The list contains data on 169 red stars, 117 of which were found for the first time: 8 are new C stars, 3 are Cstar candidates, 104 are M stars, 1 is either an M or an S star, and 1 object on the survey plate cannot be classified. Of the 117 objects, 47 are unidentified IRAS sources. A statistical analysis of the objects that are and are not identified with IRAS sources shows that the identified stars are, with a high probability, brighter and have relatively more massive envelopes. Two stars were found to have fairly large brightness variability (with an amplitude of at least 6^m.O). Gasdust shells are assumed to exist around nine of the IRAS sources. The equatorial coordinates, spectral types, and stellar magnitudes, determined on Palomar E maps, are given for the selected objects. Translated from Astrofizika, Vol. 41. No. 4, pp. 545–559, October–December, 1998.  相似文献   

Investigation of galaxies of the second byurakan sky survey. II. Spectroscopic observations in the 08h00m, +59° field     

S. A. Hakopian  S. K. Balayan 《Astrophysics》2000,43(1):6-12

The results of spectroscopic observations of 25 objects of the Second Byurakan Spectroscopic Sky Survey in a field with central coordinates a = 08^h00^m, δ = +59° are given. The spectra were obtained on the 2.6- m telescope of the Byurakan Astrophysical Observatory, National Academy of Sciences of the Republic of Armenia, and the 6- m telescope of the Special Astrophysical Observatory, Russian Academy of Sciences, in 1997– 1998 with a spectral resolution of from 5 to 15Å. The redshifts and absolute stellar magnitudes of all the galaxies were determined and they were classified. A histogram of the redshift distribution of the complete sample of galaxies in this field of the survey is given.  相似文献   

Investigation of Galaxies of the Second Byurakan Sky Survey. V. Spectroscopic Observations in the Field of 12h22m, +55°     

S. A. Hakopian  S. K. Balayan 《Astrophysics》2002,45(3):267-276

The results of spectroscopic observations of 28 galaxies of the Second Byurakan Sky Survey, completing the follow-up spectroscopy of galaxies in the survey field with central coordinates = 12^h22^m, = +35°, are presented. The spectra were obtained on the 2.6 m telescope of the Byurakan Astrophysical Observatory, National Academy of Sciences of the Republic of Armenia, and the 6 m telescope of the Special Astrophysical Observatory, Russian Academy of Sciences. The redshifts and absolute stellar magnitudes of all the galaxies have been determined. A preliminary analysis of the spatial distribution of all galaxies in this sample is given.  相似文献