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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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Osservazione e dati astrometrici

Costellazione:Pegaso
Ascensione retta:22h12m47.68s
Declinazione:+15°00'31.8"
Magnitudine apparente:8.18
Distanza:246.305 parsec
Moto proprio RA:37.8
Moto proprio Dec:10.4
B-T magnitude:8.405
V-T magnitude:8.199

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 210822
TYCHO-2 2000TYC 1681-1506-1
USNO-A2.0USNO-A2 1050-20153745
HIPHIP 109653
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