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HD 193933


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Near-Infrared Spectroscopy of 0.4 < z < 1.0 CFRS Galaxies: Oxygen Abundances, SFRs, and Dust
Using new J-band VLT ISAAC and Keck NIRSPEC spectroscopy, we havemeasured Hα and [N II] λ6584 line fluxes for0.470.1 for most (but not all) of the CFRSgalaxies indicate that they lie on the high-metallicity branch of theR23 calibration; (4) about one-third of the 0.47

New Estimates of the Solar-Neighborhood Massive Star Birthrate and the Galactic Supernova Rate
The birthrate of stars of masses >=10 Msolar is estimatedfrom a sample of just over 400 O3-B2 dwarfs within 1.5 kpc of the Sunand the result extrapolated to estimate the Galactic supernova ratecontributed by such stars. The solar-neighborhood Galactic-plane massivestar birthrate is estimated at ~176 stars kpc-3Myr-1. On the basis of a model in which the Galactic stellardensity distribution comprises a ``disk+central hole'' like that of thedust infrared emission (as proposed by Drimmel and Spergel), theGalactic supernova rate is estimated at probably not less than ~1 normore than ~2 per century and the number of O3-B2 dwarfs within the solarcircle at ~200,000.

Spectral Classification of Stars in A Supplement to the Bright Star Catalogue
MK spectral types are given for about 584 stars in A Supplement to theBright Star Catalogue. These are compared with Hipparcos parallaxes tocheck the reliability of those classifications. The estimated errors are+/-1.2 subtypes, and 10% of the luminosity classes may be wrong.

Catalog of Galactic OB Stars
An all-sky catalog of Galactic OB stars has been created by extendingthe Case-Hamburg Galactic plane luminous-stars surveys to include 5500additional objects drawn from the literature. This work brings the totalnumber of known or reasonably suspected OB stars to over 16,000.Companion databases of UBVβ photometry and MK classifications forthese objects include nearly 30,000 and 20,000 entries, respectively.

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观测天体数据

星座:摩羯座
右阿森松:20h23m26.26s
赤纬:-14°15'23.1"
视星:6.744
距离:373.134 天文距离
右阿森松适当运动:9.7
赤纬适当运动:0.2
B-T magnitude:6.619
V-T magnitude:6.734

目录:
适当名称
HD 1989HD 193933
TYCHO-2 2000TYC 5753-2280-1
USNO-A2.0USNO-A2 0750-20018806
HIPHIP 100556

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