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HD 197540

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Ýlgili Makaleler

Ca II H and K Filter Photometry on the UVBY System. II. The Catalog of Observations Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1995AJ....109.2828T&db_key=AST
E. W. Fick Observatory stellar radial velocity measurements. I - 1976-1984 Stellar radial velocity observations made with the large vacuumhigh-dispersion photoelectric radial velocity spectrometer at FickObservatory are reported. This includes nearly 2000 late-type starsobserved during 585 nights. Gradual modifications to this instrumentover its first eight years of operation have reduced the observationalerror for high-quality dip observations to + or - 0.8 km/s.
Radial velocities of southern stars obtained with the photoelectric scanner CORAVEL. III - 790 late-type bright stars Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1985A&AS...59...15A&db_key=AST
The sun among the stars. V - A second search for solar spectral analogs: The Hyades' distance A five-part search for a match of the solar spectrum throughout the sky,down to the limit of the Bright Star Catalog, is completed by 20A-resolution comparisons of G-type star photoelectric violet spectrawith those of Jupiter satellites and the blue sky. It is confirmed thatsolar analogs are rare. The strengths, relative to the sun, of theabsorption features at 3850 and 3740 A are measured quantitatively forall 164 stars observed. Their dependence on B-V and U-V leads to thesame solar colors previously derived from the solar analogs alone, withB-V equals 0.66 and U-B equals 0.20. Giants and subgiants are excludedfrom consideration, and stellar metal content dependence was closelyobserved. The sun is found to fit the mass-luminosity relation of theHyades within 0.16 m, independent of the assumed helium abundance, ifevolutionary and metal abundance effects are taken into account.
Radial velocities of southern HR stars Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980PASP...92..713B&db_key=AST

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Oglak
Sað Açýklýk:	20^h45^m13.20^s
Yükselim:	-27Â°14'50.0"
Görünürdeki Parlaklýk:	6.5
Uzaklýk:	144.3 parsek
özdevim Sað Açýklýk:	-2
özdevim Yükselim:	6.8
B-T magnitude:	7.673
V-T magnitude:	6.596

Kataloglar ve belirtme:

Özgün isimleri	(Edit)
HD 1989	HD 197540
TYCHO-2 2000	TYC 6929-139-1
USNO-A2.0	USNO-A2 0600-42984035
BSC 1991	HR 7931
HIP	HIP 102414

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