A study of the optical variability of the Seyfert galaxy X Comae.
Abstract
Light curves in photographic and photographic visual magnitudes have been derived for the variable galaxy X Com from plates taken during the years 1907-74. Three results were obtained from the investigation. A photographic and photoelectric sequence of stars has been established around the galaxy, with positions near the center of the Coma cluster of galaxies. A technique has been developed for removing the effects of seeing from iris photometry of a nonstellar object with respect to a stellar reference system. The light curves show some evidence for both short outbursts and slow, long-term variations in brightness, consistent with the optical activity of a Seyfert galaxy nucleus. Key words: Seyfert galaxy nuclei-photographic photometry
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- June 1977
- DOI:
- 10.1086/130111
- Bibcode:
- 1977PASP...89..255G
- Keywords:
-
- Astronomical Photometry;
- Galactic Clusters;
- Optical Correction Procedure;
- Seyfert Galaxies;
- Atmospheric Optics;
- Light Curve;
- Luminous Intensity;
- Photographic Plates;
- Astronomy;
- Light Curves:Seyfert Galaxies;
- Seyfert Galaxies: Variations