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HD 57048 (MeKamy)


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A catalog of rotational and radial velocities for evolved stars
Rotational and radial velocities have been measured for about 2000evolved stars of luminosity classes IV, III, II and Ib covering thespectral region F, G and K. The survey was carried out with the CORAVELspectrometer. The precision for the radial velocities is better than0.30 km s-1, whereas for the rotational velocity measurementsthe uncertainties are typically 1.0 km s-1 for subgiants andgiants and 2.0 km s-1 for class II giants and Ib supergiants.These data will add constraints to studies of the rotational behaviourof evolved stars as well as solid informations concerning the presenceof external rotational brakes, tidal interactions in evolved binarysystems and on the link between rotation, chemical abundance and stellaractivity. In this paper we present the rotational velocity v sin i andthe mean radial velocity for the stars of luminosity classes IV, III andII. Based on observations collected at the Haute--Provence Observatory,Saint--Michel, France and at the European Southern Observatory, LaSilla, Chile. Table \ref{tab5} also available in electronic form at CDSvia anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html

The Hα behavior in bright giant stars.
We report high resolution spectroscopic observations of the Hαline profile for a sample of 32 bright giant stars with spectral typebetween F3II and G5II. By studying the link between the Hαbehavior and the stellar rotation in such class of luminosity we havefound no clear evidence that the rotational discontinuity establishedaround F9II is related with the Hα profiles. No emission features,neither time variations or asymmetries on the Hα line profileshave been detected for the bright giants analysed in the present work.

Vitesses radiales dans 4 champs de petite latitude galactique.
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观测天体数据

星座:雙子座
右阿森松:07h20m09.57s
赤纬:+16°08'25.2"
视星:6.877
距离:393.701 天文距离
右阿森松适当运动:-7.2
赤纬适当运动:-12.2
B-T magnitude:8.236
V-T magnitude:6.99

目录:
适当名称MeKamy
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HD 1989HD 57048
TYCHO-2 2000TYC 1347-82-1
USNO-A2.0USNO-A2 1050-05035787
HIPHIP 35551

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