Výsledky vyhledávání - "Mitchell, D S"

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Precise radial velocities of giant stars V. A brown dwarf and a planet orbiting the K giant stars tau Gem and 91 Aqr

Autor: Mitchell, D. S., Reffert, S., Trifonov, T., Quirrenbach, A., Fischer, D. A.

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. For more than a decade we have used Doppler spectroscopy to acquire high precisio

Externí odkaz: http://arxiv.org/abs/1305.5107

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Precise radial velocities of giant stars. IV. A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties

Autor: Hekker, S., Snellen, I. A. G., Aerts, C., Quirrenbach, A., Reffert, S., Mitchell, D. S.

Since 1999, we have been conducting a radial velocity survey of 179 K giants using the CAT at UCO/Lick observatory. At present ~20-100 measurements have been collected per star with a precision of 5 to 8 m/s. Of the stars monitored, 145 (80%) show ra

Externí odkaz: http://arxiv.org/abs/0801.0741

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Radial velocities of giant stars: an investigation of line profile variations

Autor: Hekker, S., Snellen, I. A. G., Aerts, C., Quirrenbach, A., Reffert, S., Mitchell, D. S.

Publikováno v: J.Phys.Conf.Ser.118:012058,2008

Since 1999, a radial velocity survey of 179 red giant stars is ongoing at Lick Observatory with a one month cadence. At present ~20-100 measurements have been collected per star with an accuracy of 5 to 8 m/s. Of the stars monitored, 145 (80%) show r

Externí odkaz: http://arxiv.org/abs/0710.4134

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The spin axes orbital alignment of both stars within the eclipsing binary system V1143Cyg using the Rossiter-McLaughlin effect

Autor: Albrecht, S., Reffert, S., Snellen, I., Quirrenbach, A., Mitchell, D. S.

Context: The Rossiter-McLaughlin (RM) effect, a rotational effect in eclipsing systems, provides unique insight into the relative orientation of stellar spin axes and orbital axes of eclipsing binary systems. Aims: Our aim is to develop a robust meth

Externí odkaz: http://arxiv.org/abs/0708.2918

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Precise radial velocities of giant stars: I. Stable stars

Autor: Hekker, S., Reffert, S., Quirrenbach, A., Mitchell, D. S., Fischer, D. A., Marcy, G. W., Butler, R. P.

Context: Future astrometric missions such as SIM PlanetQuest need very stable reference stars. K giants have large luminosities, which place them at large distances and thus the jitter of their photocenters by companions is relatively small. Therefor

Externí odkaz: http://arxiv.org/abs/astro-ph/0604502

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