SKY-MAP.ORG

To Survive in the Universe

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HD 251117

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관련 글

UBV beta Database for Case-Hamburg Northern and Southern Luminous Stars A database of photoelectric UBV beta photometry for stars listed in theCase-Hamburg northern and southern Milky Way luminous stars surveys hasbeen compiled from the original research literature. Consisting of over16,000 observations of some 7300 stars from over 500 sources, thisdatabase constitutes the most complete compilation of such photometryavailable for intrinsically luminous stars around the Galactic plane.Over 5000 stars listed in the Case-Hamburg surveys still lackfundamental photometric data.
Selection of standard stars for photometric observations with the 91-cm reflector at Okayama Not Available
Empirical temperature calibrations for early-type stars Three temperature calibrations of suitable photometric quantities havebeen derived for O and B stars. A sample of 120 stars with reliableT(eff.) determinations has been used for establishing each calibration.The different calibrations have been critically discussed and compared.Temperature determinations for 1009 program stars have been obtainedwith an accuracy of the order of 10 percent.
The interstellar 217 NM band - A third catalogue of equivalent widths A catalog of equivalent widths of the 217 nm interstellar absorptionband as well as other parameters characterizing the extinction curve inthe ultraviolet has been compiled for 790 O and B stars. A relativelytight correlation between the equivalent width of the 217 nm band andE(B-V) indicates that the absorber of this band is connected with thepopulation of larger interstellar grains responsible for the visualextinction. The parameter characterizing the amount of extinction in thefar UV is only weakly correlated with E(B-V), a result in accord withthe assumption that a second population of very small grains causes therapid increase of the far-UV extinction.
A catalog of ultraviolet interstellar extinction excesses for 1415 stars Ultraviolet interstellar extinction excesses are presented for 1415stars with spectral types B7 and earlier. The excesses with respect to Vare derived from Astronomical Netherlands Satellite (ANS) 5-channel UVphotometry at central wavelengths of approximately 1550, 1800, 2500, and3300 A. A measure of the excess extinction in the 2200-A extinction bumpis also given. The data are valuable for investigating the systematicsof peculiar interstellar extinction and for studying the character of UVinterstellar extinction in the general direction of stars for which theextinction-curve shape is unknown.
Interstellar extinction and ultraviolet flux distribution of the Crab Nebula Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1981ApJ...245..581W&db_key=AST
Vitesses radiales dans 4 champs de petite latitude galactique. Not Available
Studies in Galactic STRUCTURE.II.LUMINOSITY Classification for 1270 Blue Giant Stars. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1955ApJS....2...41M&db_key=AST
Polarization of Stellar Radiation. III. The Polarization of 841 Stars. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1951ApJ...114..241H&db_key=AST
A Finding List of O and B Stars of High Luminosity. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1951ApJ...113..141N&db_key=AST

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관측 및 측정 데이터

별자리:	마차부자리
적경:	06^h04^m58.66^s
적위:	+28Â°46'00.8"
가시등급:	9.122
적경상의 고유운동:	-0.3
적위상의 고유운동:	-1.9
B-T magnitude:	9.265
V-T magnitude:	9.134

천체목록:

일반명	(Edit)
HD 1989	HD 251117
TYCHO-2 2000	TYC 1876-2016-1
USNO-A2.0	USNO-A2 1125-03324535

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