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GasDust Shells around Some Early-Type Stars with an IR Excess (of Emission) The results of an investigation of IR (IRAS) observations of 58OBAF stars of different luminosity classes, whichare mainly members of various associations, are presented. The colorindices of these stars are determined and two-color diagrams areconstructed. The emission excesses at 12 and 25 mm (E 12 and E 25) arealso compared with the absorption A1640 of UV radiation. It is concludedthat 24 stars (of the 58 investigated) are disk systems of the Vegatype, to which Vega = N 53 also belongs. Eight known stars of the Vegatype are also given in the figures for comparison. The remaining 34stars may have gasdust shells and/or shelldisks. The IRemission excesses of the 34 investigated stars and 11 comparison stars(eight of them are Be-Ae stars) are evidently due both to thermalemission from grains and to the emission from freefreetransitions of electrons in the gasdust shells of these stars.
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| Stellar associations in the region of CMa Forty-three early-type stars brighter than 9 mag at 1640 A were observedin the region of CMa with the Glazar Space Telescope. The observed starsare shown to compose three groups situated at distances of 320, 570, and1100 pc. The first two groups are B-associations, and the third is anO-association. It is concluded that the dust matter situated atdistances up to 1000 pc yields an interstellar extinction parameter of0.7 mag at 1640 A.
| A study of the stellar association Canis Major OB 1. Abstract image available at:http://adsabs.harvard.edu/abs/1974A&A....37..229C
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Osservazione e dati astrometrici
Costellazione: | Unicorno |
Ascensione retta: | 06h59m35.28s |
Declinazione: | -09°30'04.5" |
Magnitudine apparente: | 8.811 |
Distanza: | 588.235 parsec |
Moto proprio RA: | -3.4 |
Moto proprio Dec: | 3.1 |
B-T magnitude: | 8.66 |
V-T magnitude: | 8.799 |
Cataloghi e designazioni:
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