Исследование кинематики звезд каталога GAIA Data Release 2 with Radial Velocities с помощью скалярных и векторных сферических функций

AbstractWe investigate the kinematics of stars in the Solar neighbourhood by combining radial velocities from the latest data release of the RAVE survey with the Tycho-Gaia Astrometric Solution presented in Gaia Data Release 1. We use moments of the velocity distribution to characterise the kinematics over a radial distance range of 6-10 kpc and up to 1 kpc away from the plane. Our ultimate goal is to use these to put new constraints on the (local) distribution of mass using the Jeans Equations.

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Gaia Data Release 2

Astronomy and Astrophysics ◽

10.1051/0004-6361/201833051 ◽

2018 ◽

Vol 616 ◽

pp. A1 ◽

Cited By ~ 3220

Author(s):

◽

A. G. A. Brown ◽

A. Vallenari ◽

T. Prusti ◽

J. H. J. de Bruijne ◽

...

Keyword(s):

Solar System ◽

Reference Frame ◽

Broad Band ◽

Radial Velocities ◽

Minor Planets ◽

Major Advance ◽

Photometric System ◽

Proper Motions ◽

Apparent Brightness ◽

Data Release

Context. We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter than magnitude 21. In addition epoch astrometry and photometry are provided for a modest sample of minor planets in the solar system. Aims. A summary of the contents of Gaia DR2 is presented, accompanied by a discussion on the differences with respect to Gaia DR1 and an overview of the main limitations which are still present in the survey. Recommendations are made on the responsible use of Gaia DR2 results. Methods. The raw data collected with the Gaia instruments during the first 22 months of the mission have been processed by the Gaia Data Processing and Analysis Consortium (DPAC) and turned into this second data release, which represents a major advance with respect to Gaia DR1 in terms of completeness, performance, and richness of the data products. Results. Gaia DR2 contains celestial positions and the apparent brightness in G for approximately 1.7 billion sources. For 1.3 billion of those sources, parallaxes and proper motions are in addition available. The sample of sources for which variability information is provided is expanded to 0.5 million stars. This data release contains four new elements: broad-band colour information in the form of the apparent brightness in the GBP (330–680 nm) and GRP (630–1050 nm) bands is available for 1.4 billion sources; median radial velocities for some 7 million sources are presented; for between 77 and 161 million sources estimates are provided of the stellar effective temperature, extinction, reddening, and radius and luminosity; and for a pre-selected list of 14 000 minor planets in the solar system epoch astrometry and photometry are presented. Finally, Gaia DR2 also represents a new materialisation of the celestial reference frame in the optical, the Gaia-CRF2, which is the first optical reference frame based solely on extragalactic sources. There are notable changes in the photometric system and the catalogue source list with respect to Gaia DR1, and we stress the need to consider the two data releases as independent. Conclusions. Gaia DR2 represents a major achievement for the Gaia mission, delivering on the long standing promise to provide parallaxes and proper motions for over 1 billion stars, and representing a first step in the availability of complementary radial velocity and source astrophysical information for a sample of stars in the Gaia survey which covers a very substantial fraction of the volume of our galaxy.

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The Sixth Data Release of the Radial Velocity Experiment (RAVE). I. Survey Description, Spectra, and Radial Velocities

The Astronomical Journal ◽

10.3847/1538-3881/ab9ab9 ◽

2020 ◽

Vol 160 (2) ◽

pp. 82 ◽

Cited By ~ 5

Author(s):

Matthias Steinmetz ◽

Gal Matijevič ◽

Harry Enke ◽

Tomaž Zwitter ◽

Guillaume Guiglion ◽

...

Keyword(s):

Radial Velocity ◽

Radial Velocities ◽

Data Release

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Solving the distance discrepancy for the open cluster NGC 2453

Astronomy and Astrophysics ◽

10.1051/0004-6361/201935243 ◽

2019 ◽

Vol 626 ◽

pp. A10 ◽

Cited By ~ 2

Author(s):

D. González-Díaz ◽

C. Moni Bidin ◽

E. Silva-Villa ◽

G. Carraro ◽

D. Majaess ◽

...

Keyword(s):

Planetary Nebula ◽

Open Cluster ◽

Independent Method ◽

Radial Velocities ◽

Line Of Sight ◽

Fundamental Parameters ◽

Data Release ◽

Cluster Distance ◽

Ubvri Photometry ◽

Good Agreement

Context. The open cluster (OC) NGC 2453 is of particular importance since it has been considered to host the planetary nebula (PN) NGC 2452, however their distances and radial velocities are strongly contested. Aims. In order to obtain a complete picture of the fundamental parameters of the OC NGC 2453, 11 potential members were studied. The results allowed us to resolve the PN NGC 2452 membership debate. Methods. Radial velocities for the 11 stars in NGC 2453 and the PN were measured and matched with Gaia data release 2 (DR2) to estimate the cluster distance. In addition, we used deep multi-band UBVRI photometry to get fundamental parameters of the cluster via isochrone fitting on the most likely cluster members, reducing inaccuracies due to field stars. Results. The distance of the OC NGC 2453 (4.7 ± 0.2 kpc) was obtained with an independent method solving the discrepancy reported in the literature. This result is in good agreement with an isochrone fitting of 40–50 Myr. On the other hand, the radial velocity of NGC 2453 (78 ± 3 km s−1) disagrees with the velocity of NGC 2452 (62 ± 2 km s−1). Our results show that the PN is a foreground object in the line of sight. Conclusions. Due to the discrepancies found in the parameters studied, we conclude that the PN NGC 2452 is not a member of the OC NGC 2453.

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Gaia Data Release 2

Astronomy and Astrophysics ◽

10.1051/0004-6361/201833273 ◽

2019 ◽

Vol 622 ◽

pp. A205 ◽

Cited By ~ 66

Author(s):

D. Katz ◽

P. Sartoretti ◽

M. Cropper ◽

P. Panuzzo ◽

G. M. Seabroke ◽

...

Keyword(s):

Radial Velocity ◽

Effective Temperature ◽

Radial Velocities ◽

Positive Trend ◽

Full Dataset ◽

Data Release ◽

Astrometric Data

Context. For Gaia DR2, 280 million spectra collected by the Radial Velocity Spectrometer instrument on board Gaia were processed, and median radial velocities were derived for 9.8 million sources brighter than GRVS = 12 mag. Aims. This paper describes the validation and properties of the median radial velocities published in Gaia DR2. Methods. Quality tests and filters were applied to select those of the 9.8 million radial velocities that have the quality to be published in Gaia DR2. The accuracy of the selected sample was assessed with respect to ground-based catalogues. Its precision was estimated using both ground-based catalogues and the distribution of the Gaia radial velocity uncertainties. Results. Gaia DR2 contains median radial velocities for 7 224 631 stars, with Teff in the range [3550, 6900] K, which successfully passed the quality tests. The published median radial velocities provide a full-sky coverage and are complete with respect to the astrometric data to within 77.2% (for G ≤ 12.5 mag). The median radial velocity residuals with respect to the ground-based surveys vary from one catalogue to another, but do not exceed a few 100 m s−1. In addition, the Gaia radial velocities show a positive trend as a function of magnitude, which starts around GRVS ~ 9 mag and reaches about + 500 m s−1 at GRVS = 11.75 mag. The origin of the trend is under investigation, with the aim to correct for it in Gaia DR3. The overall precision, estimated from the median of the Gaia radial velocity uncertainties, is 1.05 km s−1. The radial velocity precision is a function of many parameters, in particular, the magnitude and effective temperature. For bright stars, GRVS ∈ [4, 8] mag, the precision, estimated using the full dataset, is in the range 220–350 m s−1, which is about three to five times more precise than the pre-launch specification of 1 km s−1. At the faint end, GRVS = 11.75 mag, the precisions for Teff = 5000 and 6500 K are 1.4 and 3.7 km s−1, respectively.

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RAVE-Gaia and the impact on Galactic archeology

Proceedings of the International Astronomical Union ◽

10.1017/s1743921317006160 ◽

2017 ◽

Vol 12 (S330) ◽

pp. 176-180

Author(s):

Andrea Kunder

Keyword(s):

Radial Velocity ◽

Effective Temperature ◽

Milky Way ◽

Radial Velocities ◽

Surface Gravity ◽

Individual Stars ◽

Dynamic Analyses ◽

Data Release ◽

The Impact ◽

Temperature Surface

AbstractThe new data release (DR5) of the RAdial Velocity Experiment (RAVE) includes radial velocities of 520,781 spectra of 457,588 individual stars, of which 215,590 individual stars are released in the Tycho-Gaia astrometric solution (TGAS) in Gaia DR1. Therefore, RAVE contains the largest TGAS overlap of the recent and ongoing Milky Way spectroscopic surveys. Most of the RAVE stars also contain stellar parameters (effective temperature, surface gravity, overall metallicity), as well as individual abundances for Mg, Al, Si, Ca, Ti, Fe, and Ni. Combining RAVE with TGAS brings the uncertainties in space velocities down by a factor of 2 for stars in the RAVE volume – 10 km s−1 uncertainties in space velocities are now able to be derived for the majority (70%) of the RAVE-TGAS sample, providing a powerful platform for chemo-dynamic analyses of the Milky Way. Here we discuss the RAVE-TGAS impact on Galactic archaeology as well as how the Gaia parallaxes can be used to break degeneracies within the RAVE spectral regime for an even better return in the derivation of stellar parameters and abundances.

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Galactic Archeology with RAVE and TGAS

Proceedings of the International Astronomical Union ◽

10.1017/s1743921317008791 ◽

2017 ◽

Vol 13 (S334) ◽

pp. 116-119

Author(s):

Matthias Steinmetz ◽

Keyword(s):

Radial Velocities ◽

Proper Motions ◽

Basic Properties ◽

Gaia Dr1 ◽

Disk Structure ◽

Data Release ◽

Data Products ◽

Derived Data ◽

Astrometric Data

AbstractThe 5th RAVE data release is based on 520,781 spectra (R ≈ 7500 in the CaT region at 8410 - 8795Å) of 457,588 unique stars. RAVE DR5 provides radial velocities, stellar parameters and individual abundances for up to seven elements and distances found using isochrones for a considerable subset of these objects. In particular, RAVE DR5 has 255,922 stellar observations that also have parallaxes and proper motions from the Tycho-Gaia astrometric solution (TGAS) in Gaia DR1. The combination of RAVE and TGAS thus provides the currently largest overlap of spectroscopic and space-based astrometric data and thus can serve as a formidable preview of what Gaia is going to deliver in coming data releases. Basic properties of the RAVE+TGAS survey and its derived data products are presented as well as first applications w.r.t wave-like patterns in the disk structure. An outlook to the 6th RAVE data release is given.

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Кинематические параметры поля скоростей звезд области вокруг Солнца радиусом до 3 Кпк по данным каталога GAIA Data Release 2 with Radial Velocities

Письма в астрономический журнал Астрономия и космическая астрофизика ◽

10.1134/s0320010819070076 ◽

2019 ◽

Vol 45 (07) ◽

pp. 517-528

Author(s):

А. С. Цветков ◽

Ф. А. Амосов

Keyword(s):

Radial Velocities ◽

Data Release

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Gaia Data Release 2

Astronomy and Astrophysics ◽

10.1051/0004-6361/201833234 ◽

2018 ◽

Vol 616 ◽

pp. A17 ◽

Cited By ~ 299

Author(s):

F. Arenou ◽

X. Luri ◽

C. Babusiaux ◽

C. Fabricius ◽

A. Helmi ◽

...

Keyword(s):

Statistical Analysis ◽

Solar System ◽

Spectroscopic Data ◽

Statistical Properties ◽

Radial Velocities ◽

Systematic Analysis ◽

External Data ◽

Accuracy And Precision ◽

Solar System Objects ◽

Data Release

Context. The second Gaia data release (DR2) contains very precise astrometric and photometric properties for more than one billion sources, astrophysical parameters for dozens of millions, radial velocities for millions, variability information for half a million stars from selected variability classes, and orbits for thousands of solar system objects. Aims. Before the catalogue was published, these data have undergone dedicated validation processes. The goal of this paper is to describe the validation results in terms of completeness, accuracy, and precision of the various Gaia DR2 data. Methods. The validation processes include a systematic analysis of the catalogue content to detect anomalies, either individual errors or statistical properties, using statistical analysis and comparisons to external data or to models. Results. Although the astrometric, photometric, and spectroscopic data are of unprecedented quality and quantity, it is shown that the data cannot be used without dedicated attention to the limitations described here, in the catalogue documentation and in accompanying papers. We place special emphasis on the caveats for the statistical use of the data in scientific exploitation. In particular, we discuss the quality filters and the consideration of the properties, systematics, and uncertainties from astrometry to astrophysical parameters, together with the various selection functions.

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