Results 11 to 20 of about 440,001 (300)

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
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Spitzer spectroscopy of circumstellar disks in the 5 Myr old upper Scorpius OB association [PDF]

, 2009
We present mid-infrared spectra between 5.2 and 38 μm for 26 disk-bearing members of the ~5 Myr old Upper Scorpius OB association obtained with the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope. We find clear evidence for changes in the
Carpenter, John M., Dahm, S. E.
core   +1 more source

Fundamental Properties of Late-Type Stars in Eclipsing Binaries

Galaxies, 2022
Evidence from the analysis of eclipsing binary systems revealed that late-type stars are larger and cooler than predicted by models, and that this is probably caused by stellar magnetic activity.
Juan Carlos Morales, Ignasi Ribas, Álvaro Giménez, David Baroch   +3 more
doaj   +1 more source

A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups [PDF]

, 2010
Nearby late-type stars are excellent targets for seeking young objects in stellar associations and moving groups. The origin of these structures is still misunderstood, and lists of moving group members often change with time and also from author to ...
Aibéo, Allende Prieto, Ammler-von Eiff, Anosova, Antoja, Asiain, B. Montesinos, Baliunas, Barbier-Brossat, Barnes, Barnes, Barrado y Navascués, Barrado y Navascués, Basri, Beavers, Beichman, Boesgaard, Bryden, Butler, Butler, C. Eiroa, Chereul, Cutispoto, D. Montes, Duncan, Eggen, Eggen, Eggen, Eggen, Eggen, Eggen, Eggen, Eiroa, Eker, Famaey, Favata, Feltzing, Fleming, Flower, Fuhrmann, Fuhrmann, Gaidos, Gratton, Gray, Gray, Gálvez, Habing, Hall, Henry, Hormuth, Høg, Hünsch, J. Maldonado, Jenkins, Jianke, Johnson, Kawaler, Kharchenko, King, Kraft, Li, Li, López-Santiago, López-Santiago, López-Santiago, Makarov, Mamajek, Martínez-Arnáiz, Mason, Mayor, Meléndez, Messina, Montes, Montes, Montes, Montesinos, Moór, Neuhaeuser, Nidever, Nordström, Noyes, Pfeiffer, Pizzolato, Porto de Mello, Pourbaix, Proctor, Prosser, R. M. Martínez-Arnáiz, Radick, Ramírez, Reid, Rhee, Ribas, Saar, Saffe, Santos, Schuster, Siegler, Siess, Simon, Skiff, Skuljan, Skumanich, Soderblom, Soderblom, Soderblom, Soderblom, Soderblom, Sousa, Spangler, Stauffer, Stern, Takeda, Trilling, Valenti, Vaughan, Voges, Voges, Vogt, Weber, Wielen, Wright, Wright, Zuckerman, Zuckerman   +124 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.
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SiO Isotope Emissions from Late-Type Stars [PDF]

International Astronomical Union Colloquium, 1988
AbstractThe J=2-1, v=0 emissions of 28SiO, 29SiO, and 30SiO from three late-type stars were simultaneously observed with the Nobeyama 45-m telescope in Jaunuary 1987. The relative intensities of [29SiO] / [30SiO] were measured to be 2.4 for χ Cyg, 1.5 for NML Tau, and 2.9 for V1111 0ph.
N. Ukita, N. Kaifu
openaire   +1 more source

They might be giants: luminosity class, planet frequency, and planet-metallicity relation of the coolest Kepler target stars [PDF]

, 2012
We estimate the stellar parameters of late K and early M type Kepler target stars. We obtain medium resolution visible spectra of 382 stars with Kp-J>2 (~K5 and later spectral type).
Gaidos, Eric, Hilton, Eric, Lépine, Sébastien, Mann, Andrew W.   +3 more
core   +1 more source

On the Origins of Extreme Velocity Stars as Revealed by Large-scale Galactic Surveys

The Astronomical Journal, 2023
We assemble a large sample of 12,784 high-velocity stars with total velocity V _GSR ≥ 300 km s ^−1 , selected from RAVE DR5, SDSS DR12, LAMOST DR8, APOGEE DR16, GALAH DR2, and Gaia EDR3.
Qing-Zheng Li, Yang Huang, Xiao-Bo Dong, Hua-Wei Zhang, Timothy C. Beers, Zhen Yuan   +5 more
doaj   +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

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