scholarly journals Notes on Stellar Statistics: III. On the Calculation of a Mean Absolute Magnitude from Apparent Magnitudes, Angular Proper Motions and Linear Radial Velocities

1925 ◽  
Vol 11 (2) ◽  
pp. 130-133
Author(s):  
W. J. Luyten
Keyword(s):  
Absolute Magnitude ◽  
Radial Velocities ◽  
Proper Motions

scholarly journals The luminosity function of nearby thick-disk sub-dwarfs

2007 ◽  
Vol 3 (S248) ◽  
pp. 484-485
Author(s):  
M. I. Arifyanto
Keyword(s):  
Luminosity Function ◽  
Absolute Magnitude ◽  
Mass Function ◽  
Initial Mass Function ◽  
Radial Velocities ◽  
Thick Disk ◽  
Initial Mass ◽  
Proper Motions ◽  
Dwarf Stars ◽  
Magnitude Range

AbstractWe derived the luminosity function of thick disk using V/Vmax method for nearby sub-dwarf stars based on the sample stars of Carney et al. (1994). Hipparcos parallaxes and proper motions and Tycho2 proper motions were combined with radial velocities and metallicities from CLLA. We found that the luminosity function in the absolute magnitude range MV = 4–6 mag agree well with the luminosity function derived from the initial mass function (Reyle & Robin 2001).

Investigation of relative motion in the triple system ADS 48 on the basis of Gaia DR2 and Pulkovo 26-inch refractor observations

2021 ◽  
pp. 89-98
Author(s):  
O. V. KIYAEVA ◽  
R. YA. ZHUCHKOV ◽  
I.S. IZMAILOV
Keyword(s):  
High Precision ◽  
Relative Motion ◽  
Apparent Motion ◽  
Triple System ◽  
Radial Velocities ◽  
Proper Motions ◽  
The Family ◽  
Outer Pair ◽  
Motion Parameters ◽  
Gaia Dr2

There are high-precision positions, proper motions, parallaxes and radial velocities at the instant 2015.5 for all three components of the star ADS 48 ABF in the catalogue Gaia DR2 (2018). According to these data relative motions and the family of orbits were calculated by the Apparent Motion Parameters (AMP) method (Kiselev and Kiyaeva, 1980), and the best orbit was chosen for the inner pair AB. A perturbation with the period of 11 years was discovered according to Pulkovo observations of the outer pair. The reasons for the perturbation are discussed.

scholarly journals Esiderata for nearby - star quantities observable with small telescope

1986 ◽  
Vol 118 ◽  
pp. 247-249
Author(s):  
W. Gliese
Keyword(s):  
Broad Band ◽  
Radial Velocities ◽  
General Assembly ◽  
New Delhi ◽  
Proper Motions ◽  
Nearby Star ◽  
Small Telescope ◽  
General Catalogue ◽  
Nearby Stars

At the General Assembly of the IAU at New Delhi van Altena reported on the new General Catalogue of Trigonometric Stellar Parallaxes (GCTSP) which was completed recently at the Yale Observatory. Time seems to be ripe now for the compilation of a Third Catalogue of Nearby Stars which will include all objects known to be nearer than 25 parsecs. This catalogue will contain positions, proper motions, radial velocities, spectral types, broad-band photometry, and parallaxes - quantities won by observations.

scholarly journals The Gaia ultracool dwarf sample – II. Structure at the end of the main sequence

2019 ◽  
Vol 485 (3) ◽  
pp. 4423-4440 ◽  
Author(s):  
R L Smart ◽  
F Marocco ◽  
L M Sarro ◽  
D Barrado ◽  
J C Beamín ◽  
...  
Keyword(s):  
Main Sequence ◽  
Absolute Magnitude ◽  
Proper Motions ◽  
Work Package ◽  
Large Area ◽  
Training Set ◽  
Multiple Systems ◽  
Sky Surveys ◽  
Notable Increase ◽  
Complete Catalogue

ABSTRACT We identify and investigate known late M, L, and T dwarfs in the Gaia second data release. This sample is being used as a training set in the Gaia data processing chain of the ultracool dwarfs work package. We find 695 objects in the optical spectral range M8–T6 with accurate Gaia coordinates, proper motions, and parallaxes which we combine with published spectral types and photometry from large area optical and infrared sky surveys. We find that 100 objects are in 47 multiple systems, of which 27 systems are published and 20 are new. These will be useful benchmark systems and we discuss the requirements to produce a complete catalogue of multiple systems with an ultracool dwarf component. We examine the magnitudes in the Gaia passbands and find that the GBP magnitudes are unreliable and should not be used for these objects. We examine progressively redder colour–magnitude diagrams and see a notable increase in the main-sequence scatter and a bivariate main sequence for old and young objects. We provide an absolute magnitude – spectral subtype calibration for G and GRP passbands along with linear fits over the range M8–L8 for other passbands.

scholarly journals Proper Motions of OB Stars in Both Hemispheres

1974 ◽  
Vol 61 ◽  
pp. 227-227
Author(s):  
Haruo Yasuda
Keyword(s):  
Southern Hemisphere ◽  
Fundamental System ◽  
Systematic Errors ◽  
Radial Velocities ◽  
Distance Scale ◽  
Proper Motions ◽  
Stellar Kinematics ◽  
Ob Stars

From a comparison between the rotational velocities derived from radial velocities and space motions of OB stars, large systematic errors of FK4 proper motions in the southern hemisphere are evaluated; these may be expected, from the known accuracy of the FK4. The error of adopted distance scale is also examined. It is suggested that meridian observations of OB stars should be extended to the southern hemisphere to further researches, not only on stellar kinematics, but also on the fundamental system.

scholarly journals A Determination of Secular Parallaxes of Reference Stars from Relative Proper Motions of Open Clusters

1970 ◽  
Vol 7 ◽  
pp. 74-76
Author(s):  
A. N. Deutsch
Keyword(s):  
Systematic Errors ◽  
Open Clusters ◽  
Radial Velocities ◽  
Proper Motions ◽  
The Mean

The determination of secular parallaxes of stars is usually based on meridian observations of proper motions of bright stars, this introducing known systematic errors. The mean parallaxes of stars can be obtained by means of radial velocities which are known for the bright stars. The more perspective method, the reference of stars to galaxies, is not applicable at low galactic latitudes.

What we learn from TGAS about the moving groups of the Solar neighbourhood

2017 ◽  
Vol 12 (S330) ◽  
pp. 214-215
Author(s):  
B. Goldman ◽  
E. Schilbach ◽  
S. Röser ◽  
P. Schöfer ◽  
A. Derekas ◽  
...  
Keyword(s):  
Current Data ◽  
Radial Velocities ◽  
Common Origin ◽  
Solar Neighbourhood ◽  
Proper Motions ◽  
Moving Groups ◽  
The Individual

AbstractWe use the TGAS proper motions and parallaxes as well as published and new radial velocities to study the dynamics of nearby moving groups. In particular we try to determine their age using backtracing of the individual members to a common origin. We find that the current data, probably the radial velocities, do not allow to reach a successful conclusion.

scholarly journals Gaia and the Planetary Nebulae

2016 ◽  
Vol 12 (S323) ◽  
pp. 305-308
Author(s):  
Minia Manteiga ◽  
Carlos Dafonte ◽  
Marco A. Álvarez ◽  
Daniel Garabato ◽  
Ana Ulla ◽  
...  
Keyword(s):  
Planetary Nebulae ◽  
Radial Velocities ◽  
Spectral Energy ◽  
Proper Motions ◽  
Spectral Energy Distributions ◽  
Energy Distributions

AbstractAbout three years after Gaia was set into orbit, the first release of Gaia data, DR1, has been published by ESA and DPAC. Gaia’s first archive contains the results from the analysis of the initial 14 months of mission data. Outstandingly, it includes TGAS, Gaia-Tycho2 astrometric solution for about 2 million stars up to visible magnitude around 11.5.In addition to the five parameter astrometric solution for the sky (positions, parallaxes and proper motions), future Gaia data releases will provide the spectral energy distributions from 330-1050 nm, together with radial velocities, for sources brighter than visible magnitude 16. Within this context, the relevance of Gaia data for the study of PN is be briefly presented.

scholarly journals A large catalog of young active RAVE stars in the Solar neighborhood

2016 ◽  
Vol 12 (S328) ◽  
pp. 143-145
Author(s):  
Maruša Žerjal ◽  
Tomaž Zwitter ◽  
Gal Matijevič ◽  
Keyword(s):  
Main Sequence ◽  
Classification Algorithm ◽  
Radial Velocities ◽  
Solar Neighborhood ◽  
Solar Neighbourhood ◽  
Proper Motions ◽  
Active Stars ◽  
Single Field ◽  
Infrared Triplet

AbstractThe catalog of 38,000 chromospherically active RAVE dwarfs represents one of the largest samples of young active solar-like and later-type single field stars in the Solar neighbourhood. It was established from the unbiased magnitude limited RAVE Survey using an unsupervised stellar classification algorithm based merely on stellar fluxes (Ca II infrared triplet). Using a newly-calibrated age-activity relation, ~15,000 active stars are estimated to be younger than 1 Gyr. Almost 2000 stars are presumably younger than ~100 Myr and possibly still in the pre-main sequence phase, the latter being supported by their significant offset from the main sequence in the NUV − V versus J − K space. 16,000 stars from the sample have positional and velocity vectors available (using TGAS parallaxes and proper motions and radial velocities from RAVE).

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