Table 1
Photometric observations used.
| Year | Nights used | Observer/reference | Notes |
|
|
|||
| 1974 | 24 | Fitch (1980) | Note 1 |
| 1976 | 4 | Loumos (1980) | Note 2 |
| 1976 | 7 | Fitch (1980) | Note 1 |
| 1977 | 9 | Loumos (1980) | Note 2 |
| 1977 | 5 | Warman et al. (1979) | |
| 1978 | 6 | Loumos (1980) | Note 2 |
| 1983 | 8 | Breger et al. (1990) | Multisite |
| 1984 | 14 | Breger et al. (1990) | Multisite |
| 1991 | 32 | Breger et al. (2008) | |
| 1992 | 6 | Davis & Duke | Note 3 |
| 1996 | 53 | Breger et al. (1999) | Multisite |
| 1997 | 32 | Breger & Hiesberger (1999) | |
| 2005 | 62 | Breger (2016) | |
| 2006 | 63 | Breger (2016) | |
| 2007 | 86 | Breger (2016) | Note 4 |
| 2008 | 87 | Breger (2016) | Note 4 |
| 2009 | 76 | Breger (2016) | Note 4 |
| 2010 | 96 | Breger (2016) | Note 4 |
| 2011 | 108 | Breger (2016) | Note 4 |
| 2012 | 124 | Breger (2016) | Note 4 |
Notes. 1. The unpublished, extensive data obtained by Fitch in 1974 were slightly edited with several nights with large scatter removed. We also pre-whitened the low frequencies of 1.321 and 1.404 d-1, since these frequencies originate in one of the comparison stars, HD 108100 (Breger et al. 1997). 2. In the 1976–1978 analyses, the Loumos data were given double weight due to their high precision relative to the other data sets in this time period. 3. 1992: six nights of unpublished data from a continuation of the 1991 campaign added. 4. The observing seasons of 4 CVn start before January 1, for example, the observing season called “2012” covers measurements obtained during 124 nights from 2011 December to 2012 June.
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