Table 1.
Summary of spectral observations.
| Month | ⟨HJD⟩ − 2400000 | R | nϕ | Δt(d) | fϕ | Wavelength regions (Å) | ⟨S/N⟩ | σ (%) |
|---|---|---|---|---|---|---|---|---|
| July 1994 | 49558.5 | 35 000 | 19 | 14 | 98% | 6431, 6439 | 239 | 0.529 |
| August 1994 | 49583.5 | 80 000 | 11 | 10 | 90% | 6411, 6431, 6439, 7511 | 265 | 0.455 |
| November 1994 | 49673.8 | 140 000 | 9 | 9 | 86% | 6431, 6439 | 206 | 0.540 |
| July 1995 | 49916.5 | 80 000 | 11 | 11 | 95% | 6411, 6431, 6439, 7511 | 333 | 0.381 |
| October 1996 | 50384.8 | 80 000 | 8 | 7 | 75% | 6411, 6431, 6439, 7511 | 326 | 0.408 |
| June 1997 | 50623.0 | 80 000 | 12 | 10 | 97% | 6411, 6431, 6439, 7511 | 278 | 0.435 |
| July 1998 | 51003.8 | 80 000 | 13 | 13 | 96% | 6411, 6431, 6439, 7511 | 320 | 0.480 |
| October 1998 | 51092.1 | 80 000 | 10 | 8 | 85% | 6411, 6431, 6439, 7511 | 244 | 0.546 |
| November 1998 | 51124.4 | 80 000 | 7 | 6 | 69% | 6411, 6431, 6439, 7511 | 230 | 0.520 |
| May 1999 | 51328.2 | 80 000 | 14 | 10 | 93% | 6411, 6431, 6439, 7511 | 203 | 0.617 |
| July 1999 | 51388.5 | 80 000 | 11 | 10 | 97% | 6411, 6431, 6439, 7511 | 174 | 0.694 |
| October 1999 | 51474.0 | 80 000 | 9 | 9 | 64% | 6411, 6431, 6439, 7511 | 192 | 0.780 |
| August 2000 | 51768.6 | 80 000 | 21 | 11 | 100% | 6431, 6439, 7511 | 222 | 0.618 |
| June 2001 | 52068.4 | 80 000 | 15 | 7 | 89% | 6431, 6439, 7511 | 201 | 0.502 |
| August 2002 | 52511.8 | 80 000 | 23 | 9 | 100% | 6411, 6431, 6439 | 259 | 0.524 |
| November 2002 | 52594.3 | 80 000 | 8 | 12 | 68% | 6411, 6431, 6439 | 285 | 0.399 |
| June 2003 | 52803.4 | 80 000 | 16 | 19 | 95% | 6411, 6431, 6439 | 268 | 0.462 |
| November 2003 | 52950.6 | 80 000 | 18 | 20 | 100% | 6411, 6431, 6439 | 254 | 0.515 |
| August 2004 | 53220.2 | 80 000 | 16 | 13 | 89% | 6411, 6431, 6439 | 257 | 0.527 |
| July 2005 | 53571.4 | 80 000 | 11 | 16 | 75% | 6411, 6431, 6439 | 270 | 0.500 |
| November 2005 | 53690.8 | 80 000 | 6 | 10 | 50% | 6411, 6431, 6439 | 242 | 0.525 |
| September 2006 | 53982.6 | 80 000 | 13 | 9 | 91% | 6411, 6431, 6439 | 280 | 0.514 |
| December 2006 | 54074.8 | 80 000 | 8 | 7 | 75% | 6265, 6439, 6644 | 211 | 0.728 |
| July 2007 | 54305.9 | 80 000 | 12 | 10 | 94% | 6411, 6431, 6439 | 238 | 0.540 |
| September 2008 | 54721.2 | 80 000 | 7 | 6 | 60% | 6265, 6431, 6439, 6644 | 337 | 0.494 |
| December 2008 | 54811.8 | 80 000 | 6 | 6 | 49% | 6265, 6431, 6439, 6644 | 213 | 0.835 |
| August 2009 | 55074.7 | 80 000 | 9 | 11 | 78% | 6439, 6644, 6663 | 297 | 0.663 |
| September 2009 | 55075.7 | 80 000 | 11 | 12 | 80% | 6411, 6439, 6644 | 259 | 0.524 |
| December 2009 | 55197.1 | 80 000 | 5 | 6 | 47% | 6265, 6439, 6644 | 205 | 0.536 |
| July 2010 | 55402.2 | 80 000 | 10 | 13 | 89% | 6265, 6439, 6644 | 287 | 0.551 |
| December 2010 | 55552.6 | 80 000 | 4 | 12 | 31% | 6265, 6439, 6644 | 266 | 0.422 |
| December 2011 | 55908.8 | 80 000 | 4 | 4 | 40% | 6265, 6439, 6644 | 355 | 0.469 |
| August 2012 | 56170.5 | 80 000 | 9 | 7 | 87% | 6265, 6439, 6644 | 349 | 0.382 |
| November 2012 | 56259.6 | 80 000 | 4 | 11 | 40% | 6265, 6439, 6644 | 232 | 0.540 |
| August 2014 | 56886.0 | 67 000 | 10 | 9 | 84% | 6265, 6411, 6431, 6439, 6644 | 352 | 0.382 |
| December 2014 | 56996.2 | 67 000 | 6 | 6 | 58% | 6265, 6411, 6431, 6439, 6644 | 293 | 0.431 |
| July 2015 | 57209.1 | 67 000 | 9 | 9 | 78% | 6265, 6411, 6431, 6439, 6644 | 380 | 0.380 |
| November 2015 | 57355.9 | 67 000 | 7 | 8 | 69% | 6265, 6411, 6431, 6439, 6644 | 246 | 0.481 |
| June 2016 | 57560.0 | 67 000 | 8 | 8 | 75% | 6265, 6411, 6431, 6439, 6644 | 318 | 0.663 |
| June 2017 | 57914.4 | 80 000 | 7 | 10 | 59% | 6265, 6431, 6439, 6644 | 240 | 0.451 |
| December 2017 | 58108.3 | 67 000 | 5 | 4 | 49% | 6265, 6411, 6431, 6439, 6644 | 245 | 0.636 |
Notes. ⟨HJD⟩ is the mean heliocentric Julian date, R the spectral resolution, nϕ the number of observations, Δt the time span of the observations, fϕ the phase coverage of the season (see Sect. 4 for a definition), ⟨S/N⟩ the mean signal-to-noise ratio, and σ the mean deviation between the observations and DI solution.
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