HD 142686

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Infrared circumstellar shells - Origins, and clues to the evolution of massive stars
The infrared fluxes, spatial and spectral characteristics for a sampleof 111 supergiant stars of spectral types F0 through M5 are tabulated,and correlations examined with respect to the nature of theircircumstellar envelopes. One-fourth of these objects were spatialyresolved by IRAS at 60 microns and possess extended circumstellar shellmaterial, with implied expansion ages of about 10 to the 5th yr.Inferences about the production of dust, mass loss, and the relation ofthese characteristics of the evolution of massive stars, are discussed.

Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1978ApJS...38..309H&db_key=AST

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Akrep
Sað Açýklýk:	15^h56^m37.25^s
Yükselim:	-20Â°25'49.6"
Görünürdeki Parlaklýk:	8.542
Uzaklýk:	223.714 parsek
özdevim Sað Açýklýk:	-19.8
özdevim Yükselim:	4.5
B-T magnitude:	9.839
V-T magnitude:	8.65

Kataloglar ve belirtme:

Özgün isimleri
HD 1989	HD 142686
TYCHO-2 2000	TYC 6195-1751-1
USNO-A2.0	USNO-A2 0675-14908038
HIP	HIP 78082

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