Abstract
VARIABLE NEBULÆ.—Mr. Barnard, in Astronomische Nachrickten, No. 3097, mentions the cases of two nebulæ which he supposes must be of a variable type. The first has a diameter of about 1′, and appears rather like a comet, the brightness gradually increasing towards the centre, there being no nucleus. Its position for 1889˙0 was R. A. 3h. 56m. 17s., Declination + 69° 30′ 38″. The other nebula was discovered by him in 1888, and was estimated to lie between magnitudes 9 and 10, the stellar nucleus being of the thirteenth magnitude. Subsequent observations made in 1891 showed that this nebula had become considerably fainter (13½ mag.), there being still a faint nucleus visible; its diameter was estimated as ½′, while its position for 1888˙0 was R.A. oh. 37m. 55˙7s., Decl. – 8° 48′ 6″˙5.
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Our Astronomical Column. Nature 46, 211 (1892). https://doi.org/10.1038/046211a0
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DOI: https://doi.org/10.1038/046211a0