S. Mochnacki, Hale Observatories, California Institite of Technology, reports spectroscopic observations of Kuwano's novalike object (IAUC 3344). Coude scans at 1-A resolution with the Varo-RETICON detector on the Mount Wilson 250-cm telescope were taken on Apr. 13.50 and 13.51 UT (H-alpha and H-beta regions, respectively) and on Apr. 14.54 UT in the H-alpha region. H-alpha shows a very sharp P-Cyg profile, with the absorption displaced ~ 50 km/s blueward from the emission. H-beta resembles a classical Be shell star profile, with a sharp absorption core in the bottom of a dish 20 A wide and 30 percent deep. Some emission is seen blueward of the core. Other absorption lines are seen, including the Si II red doublet 6347-6371 A. The object is tentatively identified with a reddish star on the Palomar Sky Survey at R.A. = 20h18m59s.3, Decl. = +21o24'59" (+/- 10"; equinox 1950.0) with mv ~ 13. The object may be a slow nova observed near maximum light. M. Schmidt and R. Green, Hale Observatories, also report spectroscopy of the object. On Apr. 19.5 UT the spectrum (resolution 12 A) between 3600 and 6700 A showed sharp hydrogen absorption lines visible to H11. The visual magnitude was estimated at 8.2 +/- 0.3. They confirm the identification by Mochnacki and the suggestion that the object may be a recurrent nova or a previously unknown dwarf nova. K. Ishida, Y. Yamashita and K. Nariai, Tokyo Astronomical Observatory, write that this peculiar object may be an exceptionally slow nova. The precise position measured by T. Noguchi from an exposure with the 105-cm Schmidt telescope at Kiso is R.A. = 20h19m01s.08, Decl. = +21o24'43".1 (equinox 1950.0). The brightness was U = 9.6, B = 9.3, V = 9.1 on Apr. 10.77 and U = 9.6, B = 9.2, V = 8.9 on Apr. 10.79 UT. Spectrograms obtained on 103a-O emulsion by Y. Norimoto with the 91-cm reflector at the Okayama Station show normal A4-type features without emission lines on Apr. 11.8 and 12.8 UT, while a spectrogram (4o prism) obtained on IN emulsion (Schott RG695 filter) by Ishida with the 105-cm Schmidt on 1978 Sept. 6.59 UT shows M4-type features. The object has recently brightened up as follows: 1951 July 8, B ~ 16, R ~ 15 (Palomar Sky Survey); 1954 Sept. 19, B > 17 (Lick Observatory Atlas); 1968 June 28, B > 13 (Vehrenberg Atlas); 1978 Aug. 2, B > 11.5 (Y. Kuwano); 1978 Aug. 19.59 UT, I ~ 8 (105-cm Schmidt); 1978 Dec. 26.38 UT, V = 9.6 (105-cm Schmidt).
International Astronomical Union Circular
- Pub Date:
- April 1979