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The QSO 1156+295 - A multifrequency study of recent activity
Photometric observations are presented for outbursts of thequasi-stellar object QSO 1156+295 in 1981 and 1982. High time resolutionphotometry is included showing variations on time scales of weeks toabout half an hour. Data from early plate material show that the objectmay have been quite bright at the beginning of this century but wasquite faint and probably inactive between about 1950 and the beginningof recent activity in 1977-1979. Some results of optical linearpolarization are discussed. In examining spectrophotometric results,broadband spectra show very little change in spectral shape duringchanges in continuum brightness. High resolution spectra (0.1-A FWHM)show no evidence for the Mg II 2798-A absorption sometimes seen inoptically violent variables and other QSOs. The radio flux densityvariations at several frequencies are documented and discussed andcompared with the optical light curve. Models for 1156+295 are discussedincluding variability time scales, and the observed energy output iscompared with a magnetic accretion disk model proposed by Shields andWheeler (1976). Results are summarized and the different sizes of activeand inactive regions of the object are compared.
| The space distribution of late type stars in a North galactic pole region.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962AJ.....67...37U&db_key=AST
| Bergedorfer Spektral-Durchmusterung der 115 noerdlichen Kapteynschen Eichfelder+Bd.3: Eichfeld 44 bis 67, Deklination +30 deg.
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Osservazione e dati astrometrici
| Costellazione: | Orsa Maggiore |
| Ascensione retta: | 11h57m27.82s |
| Declinazione: | +29°16'27.3" |
| Magnitudine apparente: | 9.172 |
| Moto proprio RA: | -15.3 |
| Moto proprio Dec: | -2.5 |
| B-T magnitude: | 10.998 |
| V-T magnitude: | 9.323 |
Cataloghi e designazioni:
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