Gaia Data Release 1 Open cluster astrometry: performance, limitations, and future prospects
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F17%3A00480939" target="_blank" >RIV/67985815:_____/17:00480939 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1051/0004-6361/201730552" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201730552</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/201730552" target="_blank" >10.1051/0004-6361/201730552</a>
Alternative languages
Result language
angličtina
Original language name
Gaia Data Release 1 Open cluster astrometry: performance, limitations, and future prospects
Original language description
We investigate the scientific potential and limitations of the TGAS component by means of the astrometric data for open clusters. Methods. Mean cluster parallax and proper motion values are derived taking into account the error correlations within the astrometric solutions for individual stars, an estimate of the internal velocity dispersion in the cluster, and, where relevant, the effects of the depth of the cluster along the line of sight. Internal consistency of the TGAS data is assessed. Values given for standard uncertainties are still inaccurate and may lead to unrealistic unit-weight standard deviations of least squares solutions for cluster parameters. Reconstructed mean cluster parallax and proper motion values are generally in very good agreement with earlier Hipparcos-based determination, although the Gaia mean parallax for the Pleiades is a significant exception. We have no current explanation for that discrepancy. Most clusters are observed to extend to nearly 15 pc from the cluster centre, and it will be up to future Gaia releases to establish whether those potential cluster-member stars are still dynamically bound to the clusters. The Gaia DR1 provides the means to examine open clusters far beyond their more easily visible cores, and can provide membership assessments based on proper motions and parallaxes. A combined HR diagram shows the same features as observed before using the Hipparcos data, with clearly increased luminosities for older A and F dwarfs.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/LG15010" target="_blank" >LG15010: F. Magellanes: support of ground- and space-based study of stars and stellar systems in the Galaxy and Magellanic clouds</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
1432-0746
e-ISSN
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Volume of the periodical
601
Issue of the periodical within the volume
May
Country of publishing house
FR - FRANCE
Number of pages
65
Pages from-to
"A19/1"-"A19/65"
UT code for WoS article
000402313500019
EID of the result in the Scopus database
2-s2.0-85018580814