Results 21 to 30 of about 8,510,179 (297)

Radial Velocities for 889 Late‐Type Stars [PDF]

The Astrophysical Journal Supplement Series, 2002
We report radial velocities for 844 FGKM-type main sequence and subgiant stars and 45 K giants, most of which had either low-precision velocity measurements or none at all. These velocities differ from the standard stars of Udry et al. by 0.035 km/s (RMS) for the 26 FGK standard stars in common.
Nidever, David L., Marcy, Geoffrey W., Butler, R. Paul, Fischer, Debra A., Vogt, Steven S.   +4 more
openaire   +2 more sources

XMM-Newton X-ray study of early type stars in the Carina OB1 association [PDF]

, 2007
<p><b>Aims:</b> X-ray properties of the stellar population in the Carina OB1 association are examined with special emphasis on early-type stars.
I. I. Antokhin, J. C. Brown, Rauw, G., G. Rauw, J.-M. Vreux, Antokhin, I. I., Antokhin, I.I., Brown, J.C., van der Hucht, K.A., Rauw, Grégor, K. A. van der Hucht, Vreux, Jean-Marie, Vreux, J.M., van der Hucht, K. A., Brown, J. C.   +14 more
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Flare in Late-type Stars: UV [PDF]

International Astronomical Union Colloquium, 1995
Early studies of stellar flares were made entirely in the optical regime. It was recognised that flares arose from the generation of hot plasma within the stellar chromosphere at whose temperature (indicated, for instance, by the presence of a strong, blue optical continuum) a substantial emission in the ultraviolet would be expected.
openaire   +1 more source

Rotation of Late-type Stars in Praesepe with K2 [PDF]

The Astrophysical Journal, 2017
Abstract We have Fourier-analyzed 941 K2 light curves (LCs) of likely members of Praesepe, measuring periods for 86% and increasing the number of rotation periods (P) by nearly a factor of four. The distribution of P versus , a mass proxy, has three different regimes:
L. M. Rebull, J. R. Stauffer, L. A. Hillenbrand, A. M. Cody, J. Bouvier, D. R. Soderblom, M. Pinsonneault, L. Hebb   +7 more
openaire   +4 more sources

On Technetium Abundance in Late-type Stars [PDF]

Symposium - International Astronomical Union, 1988
Technetium abundances in the atmospheres of S- and C-stars are estimated by comparing the synthetic spectra and high dispersion observed spectra for the TcI λ 5924.47 region. It was found that reliable estimates are possible only for the pure S-stars and SC-stars. For the late carbon stars only the upper limit of the Tc abundance can be found.
openaire   +1 more source

Photospheric Macroturbulence in Late-Type Stars [PDF]

International Astronomical Union Colloquium, 1980
It is intimidating to attempt a review of the subject of late-type stars macroturbulence which follows so closely on the heels of David Gray’s (1978) fine review in Solar Physics. Therefore this paper will avoid many emphases of his review while filling in some areas where some progress has emerged in the last 1-1/2 years.
openaire   +1 more source

A BCool magnetic snapshot survey of solar-type stars [PDF]

, 2014
SVJ acknowledges research funding by the Deutsche Forschungsgemeinschaft (DFG) under grant SFB 963/1, project A16. JM was funded by a fellowship of the Alexander von Humboldt Foundation in Göttingen.
Jeffers, S., Ramirez-Velez, J. C., Reiners, Ansgar, Carter, B.D., Donati, J. -F., Jardine, M., do Nascimento, J.-D., Collaboration, The Bcool, Petit, P., Dintrans, B.D., Ramirez-Vèlez, J., Marsden, S., do Nascimento Jr., J., Dintrans, B., Ramirez-Veles, J.C., Donati, J., Carter, Brad D., Auriere, M., Lignieres, F., Nascimento, J. D. Do, Marsden, S. C., Van Grootel, V., Morin, J., do Nascimento, J.-D., Jr., Bouvier, J., Jeffers, Sandra V., Fares, R., Theado, S., Gastine,, Gastine, Thomas, Morin, Julien, Donati, J.-F., Van Grootel, Valérie, BCool Collaboration, do Nascimento Jr., J.-D., Lanoux, J., Morgenthaler, A., Konstantinova-Antova, R., Reiners, A., Jeffers, S.V., Jeffers, S. V., Catala, C., Gastine, T., do Nascimento, J. -D., Carter, B. D., Marsden, S.C., Carter, B., Collaboration, T.   +47 more
core   +1 more source

OH Masers in Envelopes of Late Type Stars [PDF]

Symposium - International Astronomical Union, 1987
Two studies of OH maser emission in envelopes of late type stars -miras (3) and OH/IR objects- have been performed with the Nancay radio-telescope. Mainly, the OH miras are found with thicker dust envelopes than the non OH ones. A sample of unidentified IRAS point sources selected on their colors has been observed.
A.M. Le Squeren, P. Sivagnanam, F. Tran Minh, M. Dennefeld, F. Foy   +4 more
openaire   +1 more source

Isochrones for late-type stars [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractA brief summary of the history of stellar evolution theory and the use of isochrones is given. The present state of the subject is summarized. The major uncertainties in isochrone construction are considered: chemical abundances and color calibrations, and the treatment of turbulent convection in stellar interior and atmosphere models.
openaire   +1 more source

Gravity darkening in late-type stars [PDF]

Astronomy & Astrophysics, 2018
Context.Recent interferometric data have been used to constrain the brightness distribution at the surface of nearby stars, in particular the so-called gravity darkening that makes fast rotating stars brighter at their poles than at their equator. However, good models of gravity darkening are missing for stars that posses a convective envelope.Aim.In ...
Raynaud, Raphaël, Rieutord, Michel, Petitdemange, Ludovic, Gastine, Thomas, Putigny, Bertrand   +4 more
openaire   +4 more sources