منابع مشابه
Precise radial velocities of giant stars
Aims. We aim to detect and characterize substellar companions to K giant stars to further our knowledge of planet formation and stellar evolution of intermediate-mass stars. Methods. For more than a decade we have used Doppler spectroscopy to acquire high-precision radial velocity measurements of K giant stars. All data for this survey were taken at Lick Observatory. Our survey includes 373 G a...
متن کاملConstraining the difference in convective blueshift between the components of α Cen with precise radial velocities
New radial velocities of α Cen A & B obtained in the framework the Anglo-Australian Planet Search programme as well as in the CORALIE programme are added to those by Endl et al. (2001) to improve the precision of the orbital parameters. The resulting masses are 1.105 ± 0.0070M⊙ and 0.934 ± 0.0061M⊙ for A and B respectively. The factors limiting how accurately these masses can be derived from a ...
متن کاملRetrieval of Precise Radial Velocities from Near-Infrared High Resolution Spectra of Low Mass Stars
Given that low-mass stars have intrinsically low luminosities at optical wavelengths and a propensity for stellar activity, it is advantageous for radial velocity (RV) surveys of these objects to use near-infrared (NIR) wavelengths. In this work we describe and test a novel RV extraction pipeline dedicated to retrieving RVs from low mass stars using NIR spectra taken by the CSHELL spectrograph ...
متن کامل36 Ophiuchi Ab: Incompatibility of the Orbit and Precise Radial Velocities
The long-period (600 yr) binary system 36 Ophiuchi AB consists of two chromospherically active K dwarfs. If we constrain the period using the mass-luminosity relation and the observed parallax, the remaining orbit parameters can be estimated from the 170 years of visual-binary observations. In this paper, we further constrain the orbit by precise measurements of the diierential radial velocitie...
متن کاملPrecise Radial Velocities of Giant Stars II. Pollux and its Planetary Companion
It has long been speculated that the observed periodic radial velocity pattern for the K giant Pollux might be explained in terms of an orbiting planetary companion. We have collected 80 high-resolution spectra for Pollux at Lick Observatory yielding precise radial velocities with a mean error of 3.8 m/s, providing the most comprehensive and precise data set available for this star. Our data co...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1992
ISSN: 0252-9211
DOI: 10.1017/s025292110000614x