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HD 103574

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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.
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.
OB Stellar Associations in Crux. II. Analysis and Discussion Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....111..306T&db_key=AST
OB Stellar Associations in Crux. I. Observations With the Glazar Space Telescope Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996AJ....111..299T&db_key=AST
The volume filling factor of the infrared cirrus IS 0.2 The filling factor of the infrared cirrus in which luminous stars areembedded is estimated. The stars are assumed to be randomly situatedwith respect to the cirrus. A direct ratio of the number of stars withassociated cirrus emission to those which in principle could be detectedindicates that the cirrus filling factor is roughly 0.2.
A Catalogue of Be-Stars Not Available
Discoveries on Southern Red Sensitive Objective-Prism Plates - Part Three - New Stars Having Hα in Emission Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1981A&AS...44..387M&db_key=AST
Estrellas de alta luminosidad entre Vela y Cruz. II. Not Available

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Osservazione e dati astrometrici

Costellazione:	Centauro
Ascensione retta:	11^h55^m21.66^s
Declinazione:	-63Â°42'12.8"
Magnitudine apparente:	7.979
Distanza:	961.538 parsec
Moto proprio RA:	-11.5
Moto proprio Dec:	-4.1
B-T magnitude:	7.96
V-T magnitude:	7.978

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 103574
TYCHO-2 2000	TYC 8977-310-1
USNO-A2.0	USNO-A2 0225-12718446
HIP	HIP 58128

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