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HD 216926


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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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Prediction of spectral classification from photometric observations - Application of the UVBY beta photometry and the MK spectra classification. II - General case
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&A....85...93M&db_key=AST

Prediction of spectral classification from photometric observations-application to the UVBY beta photometry and the MK spectral classification. I - Prediction assuming a luminosity class
An algorithm based on multiple stepwise and isotonic regressions isdeveloped for the prediction of spectral classification from photometricdata. The prediction assumes a luminosity class with reference touvbybeta photometry and the MK spectral classification. The precisionattained is about 90 percent and 80 percent probability of being withinone spectral subtype respectively for luminosity groups I and V and forluminosity groups III and IV. A list of stars for which discrepanciesappear between photometry and spectral classification is given.

The influence of interstellar absorption on measured strengths of the Balmer discontinuity
The definition of the Balmer-discontinuity strength from observationalspectrophotometric data is discussed in relation to detailed results onthe wavenumber dependence of the interstellar absorption. The break inthe interstellar absorption curve at a wavenumber of about 2.33permicrons is found to introduce systematic errors in many currentlydefined strengths of the Balmer discontinuity. The errors should beproportional to the amount of the color excess caused by interstellarabsorption. Using the interstellar absorption curves established byDivan (1954) and by Nandy (1964) theoretical relations are derivedbetween the amount of interstellar absorption and the correspondinginfluence on the Balmer-discontinuity strength. These linear relationsare confirmed through tests on larger sets of observational data. At thesame time the derived relations are useful as correction formulas.

Detection of errors in spectral classification by cluster analysis
Cluster analysis methods are applied to the photometric catalogue ofuvby-beta measurements by Hauck and Lindemann (1973) and point out 249stars the spectral type of which should be reconsidered or thephotometric indices of which should be redetermined.

Internal motions in the association Cep OB3.
Abstract image available at:http://adsabs.harvard.edu/abs/1973AJ.....78..185G

Spectral classification in the association III Cephei and the ratio of total-to-selective absorption.
Abstract image available at:http://adsabs.harvard.edu/abs/1970AJ.....75.1001G

Photoelectric measures of the 4430 A diffuse interstellar band
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1963MNRAS.125..141W&db_key=AST

Photoelectric Photometry of the Association III Cephei.
Abstract image available at:http://adsabs.harvard.edu/abs/1959ApJ...130...69B

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Membre dels grups següents:

Dades d'Observació i Astrometria

Constel·lació:Cepheus
Ascensió Recta:22h55m52.62s
Declinació:+63°28'23.1"
Magnitud Aparent:8.904
Distancia:515.464 parsecs
Moviment propi RA:-0.3
Moviment propi Dec:-5.6
B-T magnitude:9.165
V-T magnitude:8.926

Catàlegs i designacions:
Noms Propis
HD 1989HD 216926
TYCHO-2 2000TYC 4282-508-1
USNO-A2.0USNO-A2 1500-09393193
HIPHIP 113236
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