scholarly journals Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations

2007 ◽  
Vol 328 (9) ◽  
pp. 889-896 ◽  
Author(s):  
N.V. Kharchenko ◽  
R.-D. Scholz ◽  
A.E. Piskunov ◽  
S. Röser ◽  
E. Schilbach
Keyword(s):  
Open Clusters ◽  
Radial Velocities ◽  
Open Clusters And Associations

scholarly journals A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) – III. Exploring the properties of young associations through their variables, dippers, and candidate exoplanets

2020 ◽  
Vol 498 (4) ◽  
pp. 5972-5989
Author(s):  
D Nardiello
Keyword(s):  
Variable Stars ◽  
Open Clusters ◽  
Light Curves ◽  
Quality Data ◽  
Stellar Systems ◽  
Satellite Mission ◽  
Open Clusters And Associations ◽  
Star Forming ◽  
Star Forming Regions ◽  
Strong Candidate

ABSTRACT Young associations in star-forming regions are stellar systems that allow us to understand the mechanisms that characterize the stars in their early life and what happens around them. In particular, the analysis of the discs and of the exoplanets around young stars allows us to know the key processes that prevail in their evolution and understand the properties of the exoplanets orbiting older stars. The Transiting Exoplanet Survey Satellite mission is giving us the opportunity to extract and analyse the light curves of association members with high accuracy, but the crowding that affects these regions makes difficult the light curve extraction. In the PATHOS project, cutting-edge tools are used to extract high-precision light curves and identify variable stars and transiting exoplanets in open clusters and associations. In this work, I analysed the light curves of stars in five young (≲10 Myr) associations, searching for variables and candidate exoplanets. Using the rotational periods of the association members, I constrained the ages of the five stellar systems (∼2–10 Myr). I searched for dippers, and I investigated the properties of the dust that forms the circumstellar discs. Finally, I searched for transiting signals, finding six strong candidate exoplanets. No candidates with radius RP ≲ 0.9 RJ have been detected, in agreement with the expectations. The frequency of giant planets resulted to be ∼2–3 per cent, higher than that expected for field stars (≲ 1 per cent); the low statistic makes this conclusion not strong, and new investigations on young objects are mandatory to confirm this result.

Stellar and molecular radial velocities for six young open clusters

1988 ◽  
Vol 95 ◽  
pp. 1122 ◽  
Author(s):  
Tianxing Liu ◽  
Kenneth A. Janes ◽  
T. M. Bania ◽  
Randy L. Phelps
Keyword(s):  
Open Clusters ◽  
Radial Velocities

Independent distance determinations to Milky Way Cepheids in open clusters and associations. 1: The binary Cepheid DL CAS in NGC 129

1994 ◽  
Vol 107 ◽  
pp. 2093 ◽  
Author(s):  
Wolfgang P. Gieren ◽  
Douglas L. Welch ◽  
Jean-Claude Mermilliod ◽  
Jaymie M. Matthews ◽  
Gisela Hertling
Keyword(s):  
Milky Way ◽  
Open Clusters ◽  
Open Clusters And Associations

Cepheids in open clusters and associations

1983 ◽  
Vol 275 ◽  
pp. 732 ◽  
Author(s):  
J. D. Fernie ◽  
R. McGonegal
Keyword(s):  
Open Clusters ◽  
Open Clusters And Associations

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.

scholarly journals Independent Distance Determinations to Milky Way Cepheids in Open Clusters: A progress report on four stars

1995 ◽  
Vol 155 ◽  
pp. 361-362
Author(s):  
Wolfgang P. Giere ◽  
Jaymie M. Matthews ◽  
Jean-Claude Mermilliod ◽  
Douglas Welch
Keyword(s):  
Surface Brightness ◽  
Milky Way ◽  
Zero Point ◽  
Progress Report ◽  
Open Clusters ◽  
Open Clusters And Associations ◽  
Preliminary Results

AbstractWe have undertaken a programme to calibrate the Cepheid PL relation zero-point by obtaining distances of Cepheids in open clusters and associations via the visual surface brightness technique. Results are now available for four stars (SZ Tau, CF Cas, CV Mon and DL Cas) and others are currently under analysis. Preliminary results suggest the ‘ZAMS-fitting’ distances to the host clusters are systematically smaller than those we derive from Cepheid surface brightnesses.

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