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On the peculiar spectrum of the optical remnant of supernova A.D. 1006
Three spectral records of the faint optical filaments in the remnant ofSN 1006 show a nearly pure Balmer emission-line spectrum; the usualforbidden lines of O I, O II, O III, N II, and S II are either very weakor absent. No explanation is offered for the peculiar spectrum, but itis noted that SNR 1006 is the second remnant (after Tycho's) known tohave such a spectrum. To explain the Balmer decrement in terms of case Brecombination requires the extinction to be AV = 3 + or - 1,of which only about 0.75 mag seems to be due to galactic foregroundobscuration. The radial velocity of the filaments is nearly constantover 5 arcmin and surprisingly low, approximately -40 km/s relative tothe LSR. The absence of further, similar filaments in a 3 x 3 deg fieldcentered on the radio remnant supports van den Bergh's (1976)identification of the filaments with the optical remnant of SN 1006.
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Observation and Astrometry data
| Constellation: | Centaure |
| Right ascension: | 15h02m21.59s |
| Declination: | -41°41'26.2" |
| Apparent magnitude: | 7.584 |
| Distance: | 246.305 parsecs |
| Proper motion RA: | -10.2 |
| Proper motion Dec: | -26.8 |
| B-T magnitude: | 9.5 |
| V-T magnitude: | 7.743 |
Catalogs and designations:
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