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HD 210822

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관련 글

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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관측 및 측정 데이터

별자리:	페가수스자리
적경:	22^h12^m47.68^s
적위:	+15Â°00'31.8"
가시등급:	8.18
거리:	246.305 파섹
적경상의 고유운동:	37.8
적위상의 고유운동:	10.4
B-T magnitude:	8.405
V-T magnitude:	8.199

천체목록:

일반명	(Edit)
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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