Table 4.
Red and blue evolutionary modes for the LTVs of HR 8752, ρ Cas, and HD 179821 listed in chronological order.
| Star | Mode | Trend | Dates | JD− | Duration |
|---|---|---|---|---|---|
| of (B − V) | 24 00000 | (d) | |||
| HR 8752 | Bpg-d | 1899–1923 | 15000-23600 | 8600 | |
| Bpg-u | 1923–2001 | 23600-52000 | 28400 | ||
| V-uu B-u | red | 1942–1950 | 30500–33500 | 3000 | |
| V-d B-d | const | 1950–1957 | 33500–36000 | 2509 | |
| V-d B-d | red | 1957–1976 | 36000–43000 | 7000 | |
| V-d B-u | blue | 1976–2005 | 43000–53500 | 10500 | |
| ρ Cas | V-u B-d | red | 1965–1982 | 34000–45000 | 6000 |
| V-d B-dd | red | 1982–1986 | 45000–46500 | 1500 | |
| V-u B-uu | blue | 1986–1991 | 46500–48500 | 2000 | |
| V-c B-d | red | 1991–1998 | 48500–51000 | 2500 | |
| V-d B-dd | red | 1998–2000 | 51000–51300 | 300 | |
| V-c B-uu | blue | 2001–2009 | 52000–55500 | 3500 | |
| V-c B-dd | red | 2009–2013 | 55000–56500 | 1500 | |
| V-c B-u | blue | 2013–2015 | 56500–58100 | 1600 | |
| HD 179821 | V-d B-u | blue | 1990–1993 | 48000–49200 | 1200 |
| V-dd B-uu | blue | 1993–2004 | 49200–53200 | 4000 | |
| V-c B-d | red | 2004–2008 | 53200–54500 | 1300 | |
Notes. Second column: u = up = brightness increasing, d = down = brightness declining, if double, i.e. uu and dd, the increasing and declining, respectively, are stronger than in the other channel, c = constant. Third column: const. = constant. For clarity, the trends “blue” are in boldface. For HR 8752 and ρ Cas, the transition from a red to a blue trend is caused by an eruption (1973, and 1986, 2000, 2013, respectively). Such a significant event for HD 179821 should have happened, but was obviously missed.
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