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HD 210822

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Rotation Velocities of Red and Blue Field Horizontal-Branch Stars We present measurements of the projected stellar rotation velocities(vsini) of a sample of 45 candidate field horizontal-branch (HB) starsspanning a wide range of effective temperatures, from red HB stars withTeff~=5000K to blue HB stars with Teff of 17,000K.Among the cooler blue HB stars (Teff=7500-11500 K), weconfirm prior studies showing that, although a majority of stars rotateat vsini<15kms-1, there exists a subset of ``fastrotators'' with vsini as high as 30-35 km s-1. All but one ofthe red HB stars in our sample have vsini<10kms-1, and noanalogous rotation bimodality is evident. We also identify anarrow-lined hot star (Teff~=16,000K) with enhancedphotospheric metal abundances and helium depletion, similar to theabundance patterns found among hot BHB stars in globular clusters, andfour other stars that may also belong in this category. We discussdetails of the spectral line fitting procedure that we use to deducevsini and explore how measurements of field HB star rotation may shedlight on the issue of HB star rotation in globular clusters.
The Fundamental Parameters of Field Horizontal-Branch Stars Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....112.2291G&db_key=AST
Spectral Characteristics of Field Horizontal-Branch Stars Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....112.2286C&db_key=AST
Finding charts for field horizontal-branch A-type stars. Not Available
Possible Horizontal-Branch Stars at High Galactic Latitudes. II Not Available
Vitesse radiales dans 4 Selected Areas. Not Available

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观测天体数据

星座:	飛馬座
右阿森松:	22^h12^m47.68^s
赤纬:	+15Â°00'31.8"
视星:	8.18
距离:	246.305 天文距离
右阿森松适当运动:	37.8
赤纬适当运动:	10.4
B-T magnitude:	8.405
V-T magnitude:	8.199

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适当名称
HD 1989	HD 210822
TYCHO-2 2000	TYC 1681-1506-1
USNO-A2.0	USNO-A2 1050-20153745
HIP	HIP 109653

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